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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Registrant Name	ORIC PHARMACEUTICALS, INC.
Trading Symbol	ORIC
Entity Central Index Key	0001796280
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		29,956,050
Entity File Number	001-39269
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-1787157
Entity Address, Address Line One	240 E. Grand Ave
Entity Address, Address Line Two	2nd Floor
Entity Address, City or Town	South San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94080
City Area Code	650
Local Phone Number	388-5600
Document Quarterly Report	true
Document Transition Report	false

BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 196,642	$ 89,159
Prepaid expenses and other current assets	2,586	840
Total current assets	199,228	89,999
Property and equipment, net	1,978	2,241
Deferred offering costs		1,343
Other assets	319	510
Total assets	201,525	94,093
Current liabilities:
Accounts payable	1,389	152
Accrued other liabilities	4,389	5,202
Total current liabilities	5,778	5,354
Deferred rent - long term	500	765
Total liabilities	6,278	6,119
Commitments and contingencies (Note 8)
Stockholders' equity (deficit):
Common stock, $0.0001 par value; 1,000,000,000 shares and 26,750,000 shares authorized at June 30, 2020 and December 31, 2019, respectively; 29,924,461 shares and 1,984,222 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	3
Additional paid-in capital	307,830	2,606
Accumulated deficit	(112,586)	(92,690)
Total stockholders' equity (deficit)	195,247	(90,084)
Total liabilities, preferred stock and stockholders' equity (deficit)	$ 201,525	94,093
Series A Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		15,431
Series B Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		53,906
Series C Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		53,172
Series D Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		$ 55,549

BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Convertible preferred stock, authorized		20,348,788
Convertible preferred stock, issued		19,278,606
Convertible preferred stock, outstanding		19,278,606
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	1,000,000,000	26,750,000
Common stock, shares, issued	29,924,461	1,984,222
Common stock, shares, outstanding	29,924,461	1,984,222
Series A Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, authorized	0	3,862,500
Convertible preferred stock, issued	0	3,862,500
Convertible preferred stock, outstanding	0	3,862,500
Aggregate liquidation preference	$ 0	$ 15,450
Series B Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, authorized	0	6,750,000
Convertible preferred stock, issued		6,749,999
Convertible preferred stock, outstanding	0	6,749,999
Aggregate liquidation preference	$ 0	$ 54,000
Series C Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, authorized	0	4,448,788
Convertible preferred stock, issued		4,448,780
Convertible preferred stock, outstanding	0	4,448,780
Aggregate liquidation preference	$ 0	$ 53,385
Series D Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, authorized	0	5,287,500
Convertible preferred stock, issued		4,217,327
Convertible preferred stock, outstanding	0	4,217,327
Aggregate liquidation preference	$ 0	$ 55,669

STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating expenses:
Research and development	$ 7,723	$ 5,040	$ 14,977	$ 10,252
General and administrative	3,400	1,315	5,325	2,449
Total operating expenses	11,123	6,355	20,302	12,701
Loss from operations	(11,123)	(6,355)	(20,302)	(12,701)
Other income:
Interest income, net	25	317	266	578
Other income	74	73	140	143
Total other income	99	390	406	721
Net loss and comprehensive loss	$ (11,024)	$ (5,965)	$ (19,896)	$ (11,980)
Net loss per share, basic and diluted	$ (0.51)	$ (3.19)	$ (1.68)	$ (6.51)
Weighted-average shares outstanding, basic and diluted	21,627,361	1,872,309	11,808,103	1,841,233

STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands	Total	Initial Public Offering	Series A Convertible Preferred Stock	Series B Convertible Preferred Stock	Series C Convertible Preferred Stock	Series D Convertible Preferred Stock	Common Stock	Common Stock Initial Public Offering	Additional Paid-in Capital	Additional Paid-in Capital Initial Public Offering	Accumulated Deficit
Beginning Balance at Dec. 31, 2018			$ 15,431	$ 53,906	$ 37,929
Beginning Balance (in shares) at Dec. 31, 2018			3,862,500	6,749,999	3,177,271
Beginning Balance (in shares) at Dec. 31, 2018							1,802,134
Beginning Balance at Dec. 31, 2018	$ (64,426)								$ 1,381		$ (65,807)
Issuance of preferred stock, net of issuance costs					$ 15,243
Issuance of preferred stock, net of issuance costs (in shares)					1,271,509
Exercise of common stock options and vesting of early exercised common stock options	21								21
Exercise of common stock options and vesting of early exercised common stock options (in shares)							26,159
Stock-based compensation expense	191								191
Net loss	(6,015)										(6,015)
Ending Balance at Mar. 31, 2019			$ 15,431	$ 53,906	$ 53,172
Ending Balance (in shares) at Mar. 31, 2019			3,862,500	6,749,999	4,448,780
Ending Balance at Mar. 31, 2019	(70,229)								1,593		(71,822)
Ending Balance (in shares) at Mar. 31, 2019							1,828,293
Issuance of preferred stock, net of issuance costs						$ 49,864
Issuance of preferred stock, net of issuance costs (in shares)						3,777,564
Exercise of common stock options and vesting of early exercised common stock options	59								59
Exercise of common stock options and vesting of early exercised common stock options (in shares)							111,884
Stock-based compensation expense	190								190
Net loss	(5,965)										(5,965)
Ending Balance at Jun. 30, 2019			$ 15,431	$ 53,906	$ 53,172	$ 49,864
Ending Balance (in shares) at Jun. 30, 2019			3,862,500	6,749,999	4,448,780	3,777,564
Ending Balance at Jun. 30, 2019	$ (75,945)								1,842		(77,787)
Ending Balance (in shares) at Jun. 30, 2019							1,940,177
Beginning Balance at Dec. 31, 2019			$ 15,431	$ 53,906	$ 53,172	$ 55,549
Beginning Balance (in shares) at Dec. 31, 2019	19,278,606		3,862,500	6,749,999	4,448,780	4,217,327
Beginning Balance (in shares) at Dec. 31, 2019	1,984,222						1,984,222
Beginning Balance at Dec. 31, 2019	$ (90,084)								2,606		(92,690)
Exercise of common stock options and vesting of early exercised common stock options	12								12
Exercise of common stock options and vesting of early exercised common stock options (in shares)							13,433
Stock-based compensation expense	527								527
Net loss	(8,872)										(8,872)
Ending Balance at Mar. 31, 2020			$ 15,431	$ 53,906	$ 53,172	$ 55,549
Ending Balance (in shares) at Mar. 31, 2020			3,862,500	6,749,999	4,448,780	4,217,327
Ending Balance at Mar. 31, 2020	(98,417)								3,145		(101,562)
Ending Balance (in shares) at Mar. 31, 2020							1,997,655
Exercise of common stock options and vesting of early exercised common stock options	39								39
Exercise of common stock options and vesting of early exercised common stock options (in shares)							23,200
Stock-based compensation expense	1,381								1,381
Initial public offering of common stock		$ 138,000						$ 1		$ 137,999
Initial public offering of common stock (in shares)								8,625,000
Issuance costs associated with initial public offering		$ (12,790)								$ (12,790)
Conversion to Common Stock			$ (15,431)	$ (53,906)	$ (53,172)	$ (55,549)
Conversion to Common Stock (in shares)			(3,862,500)	(6,749,999)	(4,448,780)	(4,217,327)
Conversion to Common Stock	178,058						$ 2		178,056
Conversion to Common Stock (in shares)							19,278,606
Net loss	(11,024)										(11,024)
Ending Balance (in shares) at Jun. 30, 2020			0	0	0	0
Ending Balance at Jun. 30, 2020	$ 195,247						$ 3		$ 307,830		$ (112,586)
Ending Balance (in shares) at Jun. 30, 2020	29,924,461						29,924,461

STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Series C Convertible Preferred Stock
Preferred stock, issuance costs	$ 213

STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (19,896)	$ (11,980)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	496	488
Share-based compensation expense	1,908	381
Loss on fixed asset disposal		3
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(1,746)	(129)
Accounts payable and accrued other liabilities	1,375	212
Net cash used in operating activities	(17,863)	(11,025)
Cash flows from investing activities:
Acquisitions of property and equipment	(206)	(493)
Proceeds from notes receivable	193
Net cash used in investing activities	(13)	(493)
Cash flows from financing activities:
Proceeds from issuance of common stock pursuant to initial public offering, gross	138,000
Issuance costs associated with initial public offering	(12,692)
Proceeds from issuance of preferred stock		65,122
Issuance cost associated with preferred stock		(15)
Proceeds from stock option exercises	51	80
Net cash provided by financing activities	125,359	65,187
Net increase in cash and cash equivalents	107,483	53,669
Cash and cash equivalents, beginning of period	89,159	42,636
Cash and cash equivalents, end of period	196,642	96,305
Supplemental disclosure of non-cash investing and financing activities:
Conversion of preferred stock to common stock	178,058
Amounts accrued for purchase of property and equipment	$ 27	193
Amounts accrued for preferred stock issuance costs		$ 109

Description of the Business

6 Months Ended

Jun. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Description of the Business

1. Description of the Business

ORIC Pharmaceuticals, Inc. (ORIC or the Company) is a clinical-stage biopharmaceutical company dedicated to improving patients’ lives by Overcoming Resistance In Cancer. The Company was incorporated in Delaware in August 2014 and has offices in South San Francisco and San Diego, California.

Since inception, the Company has devoted its primary efforts to raising capital and research and development activities and has incurred significant operating losses and negative cash flows from operations. As of June 30, 2020, the Company had an accumulated deficit of $112.6 million. Through June 30, 2020, all of the Company’s financial support has been provided primarily from the sale of convertible preferred stock and proceeds from the issuance of common stock.

As the Company continues its expansion, it may seek additional financing and/or strategic investments, however, there can be no assurance that any additional financing or strategic investments will be available to the Company on acceptable terms, if at all. If events or circumstances occur such that the Company does not obtain additional funding, it will most likely be required to reduce its plans and/or certain discretionary spending, which could have a material adverse effect on the Company’s ability to achieve its intended business objectives. The accompanying financial statements do not include any adjustments that might be necessary if it were unable to continue as a going concern. Management believes that it has sufficient working capital on hand to fund operations through at least the next twelve months from the date of the issuance of these unaudited interim financial statements.

Initial Public Offering and Related Transaction

On April 28, 2020, the Company completed an initial public offering (IPO) selling 8,625,000 shares of common stock, which includes the full exercise by the underwriters of their option to purchase up to 1,125,000 additional shares, at a price of $16.00 per share resulting in gross proceeds of $138.0 million. After deducting underwriting discounts and commissions and other offering expenses related to the IPO of $12.8 million, the net proceeds to the Company from the transaction were $125.2 million. In connection with the IPO, all shares of convertible preferred stock outstanding at the time of the IPO converted into 19,278,606 shares of common stock. On April 21, 2020, the Company amended its certificate of incorporation to effect a one-for-four reverse stock split of its issued and outstanding common and convertible preferred stock. The accompanying financial statements and related notes give retroactive effect to the reverse stock split for all periods presented.

Basis of Presentation and Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

2. Basis of Presentation and Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP) for interim financial information and with the instructions of the Securities and Exchange Commission (SEC) on Form 10-Q and Rule 10-01 of Regulation S-X. Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP, have been omitted. The accompanying unaudited financial statements include all known adjustments necessary for a fair presentation of the results of interim periods as required by GAAP. These adjustments consist primarily of normal recurring accruals and estimates that impact the carrying value of assets and liabilities. Operating results for the period ended June 30, 2020 are not necessarily indicative of the results that may be expected for the year ending December 31, 2020, particularly in light of the novel coronavirus pandemic, or COVID-19, and its impact on domestic and global economies. To limit the spread of COVID-19, governments have taken various actions including the issuance of stay-at-home orders and physical distancing guidelines. Accordingly, businesses have adjusted, reduced or suspended operating activities. Beginning the week of March 16, 2020, the majority of the Company’s workforce began working from home. Disruptions caused by the COVID-19 pandemic, including the effects of the stay-at-home orders and work-from-home policies, have impacted productivity, have resulted in increased operational expenses, certain adjustments to the operations of the Company’s clinical trials, the suspension of enrollment of new patients at certain of the Company’s clinical trial sites, and delays in certain supply chain activities and collecting and analyzing data from patients in the Company’s clinical trials, and may further disrupt the business and delay the development programs and regulatory timelines, the magnitude of which will depend, in part, on the length and severity of the restrictions and other limitations on the Company’s ability to conduct business in the ordinary course. As a result, research and development expenses and general and administrative expenses may vary significantly if there is an increased impact from COVID-19 on the costs and timing associated with the conduct of the clinical trials and other related business activities.

The accompanying unaudited financial statements should be read in conjunction with the audited financial statements and the related notes thereto for the year ended December 31, 2019, which are included in the Company’s final prospectus filed with the SEC pursuant to Rule 424(b)(4) on April 24, 2020 under the Securities Act of 1933, as amended (the Securities Act).

Use of Estimates

The preparation of the Company’s financial statements in conformity with GAAP requires management to make estimates and assumptions that impact the reported amounts of assets, liabilities, expenses, and the disclosure of contingent assets and liabilities

in the Company’s financial statements and accompanying notes. These estimates and assumptions are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and the recording of expenses that are not readily apparent from other sources. Actual results may differ materially from these estimates.

Concentration of Credit Risk

Financial instruments, which potentially subject the Company to concentration of credit risk, consist primarily of cash and cash equivalents. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company is exposed to credit risk in the event of default by the financial institutions holding its cash and cash equivalents that are recorded on its balance sheets. The Company mitigates its risk by investing in high-grade instruments and limiting the concentration in any one issuer, which limits its exposure. The Company has not experienced any losses since inception.

The carrying amounts of cash and cash equivalents, prepaid expenses, accounts payable and accrued other liabilities are reasonable estimates of their fair value because of the short maturity of these items.

Cash and Cash Equivalents

The Company considers all highly liquid investments with maturities of 90 days or less at the time of purchase that are readily convertible into cash as cash equivalents. These investments may include money market funds, securities issued by U.S. Government agencies, corporate debt securities and commercial paper.

Research and Development Expenses and Accrued Research and Development Expenses

The Company is required to estimate its expenses resulting from its obligations under contracts with vendors, consultants, contract research organizations (CRO), and contract manufacturing organizations (CMO) in connection with conducting research and development activities. The financial terms of these contracts vary from contract to contract and may result in payment flows that do not match the periods over which materials or services are provided under such contracts.

Research and development costs are expensed in the period in which they are incurred. External costs consist primarily of payments to outside CROs, CMOs, clinical trial sites and central laboratories in connection with the Company’s discovery and preclinical activities, process development, clinical manufacturing and clinical development activities. External expenses are recognized based on an evaluation of the progress to completion of specific tasks using information provided to the Company by its service providers or its estimate of the level of service that has been performed at each reporting date. The Company allocates external costs by program, clinical or preclinical. Internal costs consist primary of employee-related costs, laboratory supplies, facilities, depreciation and costs related to compliance with regulatory requirements. The Company does not allocate internal costs by program because these costs are deployed across multiple programs and, as such, are not separately classified.

Deferred Offering Costs

The Company capitalizes costs that are directly associated with equity financings until such financings are consummated at which time such costs are recorded against the gross proceeds of the offering. Should an in-process equity financing be abandoned, the deferred offering costs will be expensed immediately as a charge to operating expenses in the statement of operations and comprehensive loss.

Net Loss Per Share

Basic net loss per common share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period, without consideration of potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares and potentially dilutive securities outstanding for the period. As the Company has reported a net loss for all periods presented, diluted net loss per common share is the same as basic net loss per common share for those periods.

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except share and per share amounts).

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Numerator
Net loss	$	(11,024	)	$	(5,965	)	$	(19,896	)	$	(11,980	)
Denominator
Weighted average shares outstanding used in computing net loss per share, basic and diluted		21,627,361			1,872,309			11,808,103			1,841,233
Net loss per share, basic and diluted	$	(0.51	)	$	(3.19	)	$	(1.68	)	$	(6.51	)

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive:

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Options to purchase common stock		3,947,577		1,801,095		3,947,577		1,801,095
Convertible preferred stock		—		18,838,843		—		18,838,843
Total		3,947,577		20,639,938		3,947,577		20,639,938

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (FASB) under its accounting standard codifications (ASC) or other standard setting bodies and adopted by the Company as of the specified effective date, unless otherwise discussed below.

New Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (ASC 842), which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e., lessees and lessors). The new standard requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease, respectively. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. ASC 842 provides a lessee with an option to not account for leases with a term of 12 month or less as leases in the scope of the new standard. ASC 842 supersedes the previous leases standard, ASC 840 Leases. For public business entities, this ASU is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, and should be applied through a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. Early adoption is permitted. As amended by ASU No. 2020-05, for all other entities, this ASU is effective for fiscal years beginning after December 15, 2021 and interim periods within fiscal years beginning after December 15, 2022. As a result of the Company having elected the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act, ASU No. 2016-02 is effective for the Company for the year ended December 31, 2022, and all interim periods within. In July 2018, the FASB issued supplemental adoption guidance and clarification to ASC 842 within ASU No. 2018-10, Codification Improvements to Topic 842, Leases and ASU No. 2018-11, Leases (Topic 842): Targeted Improvements. ASU No. 2018-11 provides another transition method in addition to the existing modified retrospective transition method by allowing entities to initially apply the new leasing standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of accumulated deficit in the period of adoption. The Company is currently evaluating the impact the adoption of these ASUs will have on financial statements and related disclosures. The Company expects to recognize a right-of-use asset and corresponding lease liability on its balance sheets for its real estate operating leases upon adoption. See Note 8 for more information related to the Company’s lease obligations, which are presented on an undiscounted basis therein.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326) (ASC 326): Measurement of Credit Losses on Financial Instruments, which introduced the expected credit losses methodology for the measurement of credit losses on financial assets measured at amortized cost basis, replacing the previous incurred loss methodology. The amendments in Update 2016-13 added Topic 326, Financial Instruments—Credit Losses, and made several consequential amendments to the Codification. Update 2016-13 also modified the accounting for available-for-sale debt securities, which must be individually assessed for credit losses when fair value is less than the amortized cost basis, in accordance with Subtopic 326-30, Financial Instruments— Credit Losses—Available-for-Sale Debt Securities. The guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those years. Since the Company has elected to use the extended transition period under the JOBS Act available to emerging growth companies (EGCs), the ASU is effective for the Company for fiscal years beginning after December 15, 2020. The Company expects to adopt the new standard in the first quarter of 2021. The Company is currently evaluating the impact the adoption of this standard will have on its financial statements and related disclosures.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (ASU 2019-12), which eliminates certain exceptions to the general principles in Topic 740 and simplifies other areas of the existing guidance. For non-EGCs, ASU 2019-12 is effective for fiscal years beginning after December 15, 2020. For EGCs, the standard is effective for fiscal years beginning after December 15, 2021. The Company expects to adopt the new standard in the first quarter of 2022. The Company is currently evaluating the impact the adoption of ASU 2019-12 will have on its financial statements and related disclosures.

Property and Equipment, Net

6 Months Ended

Jun. 30, 2020

Property Plant And Equipment [Abstract]

Property and Equipment, Net

3. Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

	June 30, 2020			December 31, 2019
Lab equipment	$	3,933		$	3,748
Leasehold improvements		1,710			1,710
Computer hardware and software		206			158
Furniture and fixtures		140			140
Total property and equipment, gross		5,989			5,756
Less accumulated depreciation		(4,011	)		(3,515	)
Total property and equipment, net	$	1,978		$	2,241

Accrued Other Liabilities

6 Months Ended

Jun. 30, 2020

Accrued Liabilities Current [Abstract]

Accrued Other Liabilities

4. Accrued Other Liabilities

Accrued other liabilities consisted of the following (in thousands):

	June 30, 2020		December 31, 2019
Accrued compensation	$	1,604	$	1,883
Accrued clinical development costs		901		484
Accrued manufacturing costs		569		479
Deferred rent - short-term		523		495
Accrued professional fees		447		338
Other accruals		345		279
Accrued deferred financing costs		—		1,244
Total accrued other liabilities	$	4,389	$	5,202

Fair Value Measurements

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

5. Fair Value Measurements

The accounting guidance defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring or nonrecurring basis. Fair value is defined as an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, the accounting guidance establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level 1: Observable inputs such as quoted prices in active markets;

Level 2: Inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and

Level 3: Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

At June 30, 2020 and December 31, 2019, the carrying amounts of the Company’s financial instruments, which include cash and cash equivalents, accounts payable and accrued expenses, approximate fair value because of the short term nature of these instruments. Included in cash and cash equivalents at June 30, 2020 and December 31, 2019 are money market funds with a carrying value and fair value of $196.6 million and $88.1 million, respectively, based upon a Level 1 fair value assessment.

As of June 30, 2020 and December 31, 2019, the Company did not hold any Level 2 or Level 3 financial assets.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Convertible Preferred Stock

6 Months Ended

Jun. 30, 2020

Temporary Equity Disclosure [Abstract]

Convertible Preferred Stock

6. Convertible Preferred Stock

Prior to its conversion to common stock in connection with the Company’s IPO in April 2020, the Company’s convertible preferred stock was classified as temporary equity on the Company’s balance sheets in accordance with authoritative guidance. Convertible preferred stock authorized and issued and its principal terms as of December 31, 2019 consisted of the following (in thousands, except share and per share amounts):

	As of December 31, 2019
	Shares Authorized		Shares Issued and Outstanding		Issue Period	Issue Price per Share		Dividend Annual Rate per Share		Aggregate Liquidation Preference
Series A		3,862,500		3,862,500	2014 - 2015	$	4.00	$	0.32	$	15,450
Series B		6,750,000		6,749,999	2015 - 2016	$	8.00	$	0.64	$	54,000
Series C		4,448,788		4,448,780	2018 - 2019	$	12.00	$	0.96	$	53,385
Series D		5,287,500		4,217,327	2019	$	13.20	$	1.056	$	55,669
Total		20,348,788		19,278,606

In connection with the Company’s IPO in April 2020, all outstanding shares of the convertible preferred stock converted into 19,278,606 shares of common stock and the related carrying value was reclassified to common stock and additional paid-in capital. There were no shares of convertible preferred stock outstanding as of the closing of the IPO.

Equity Incentive Plans and Stock-Based Compensation

6 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Equity Incentive Plans and Stock-Based Compensation

7. Equity Incentive Plans and Stock-Based Compensation

Equity Incentive Plans

In February 2020, the Company’s Board of Directors adopted, and its stockholders approved, the 2020 Equity Incentive Plan (the 2020 Plan), which became effective in April 2020 in connection with its IPO. Upon adoption of the 2020 Plan, the Company restricted the grant of future equity awards under its 2014 Equity Incentive Plan, as amended and restated (the 2014 Plan).

The 2020 Plan provides for the grants of stock options and other equity-based awards to employees, non-employee directors, and consultants of the Company. A total of 2,656,500 shares of the Company’s common stock were initially reserved for issuance pursuant to the 2020 Plan. The number of shares reserved under the 2020 Plan also included 241,653 shares of the Company’s common stock that remained available for issuance under the 2014 Plan as of immediately prior to the effectiveness of the 2020 Plan. The 2020 Plan share reserve will be increased by the number of shares under the 2014 Plan that are repurchased, forfeited, expired or cancelled after the effective date of the 2020 Plan up to the limit under the 2020 Plan. In addition, the number of shares of the Company’s common stock available for issuance under the 2020 Plan will automatically increase on the first day of each fiscal year, beginning with the Company’s 2021 fiscal year, in an amount equal to the lessor of (1) 2,656,500 shares, (2) 5% of the outstanding shares of the Company’s common stock on the last day of the immediately preceding fiscal year, or (3) such other amount as determined by the Company’s Board of Directors.

Stock options granted under the 2020 Plan and the 2014 Plan become exercisable at various dates as determined by the Company’s Board of Directors or its authorized committee and will expire no more than ten years from their date of grant. Stock options generally vest over a four-year term. The exercise price of each option is determined by the Company’s Board of Directors, although generally options have an exercise price equal to the fair market value of the Company’s stock on the date of the option grant. In the case of incentive stock options, the exercise price shall not be less than 100% of the fair market value of the Company’s common stock at the time the option is granted. For holders of more than 10% of the Company’s total combined voting power of all classes of stock, incentive stock options may not be granted at less than 110% of the fair market value of the Company’s common stock at the date of grant and for a term not to exceed five years.

As of June 30, 2020, there were 1,559,427 shares available for future issuance under the 2020 Plan. As of December 31, 2019, there were 203,696 shares available for future issuance under the 2014 Plan.

The following table summarizes the option activity for the six months ended June 30, 2020:

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2019		2,683,441		$	3.75
Granted		1,350,759			16.42
Exercised		(36,633	)		1.54
Forfeited and cancelled		(49,990	)		3.05
Outstanding at June 30, 2020		3,947,577		$	8.13		9.0	$	100,761
Exercisable at June 30, 2020		844,559		$	1.85		8.0	$	26,926

Certain stock options granted under the Company’s 2014 Plan provided option holders the ability to early exercise their stock options prior to vesting. The shares of common stock granted from the early exercise of unvested stock options are restricted and continue to vest in accordance with the original vesting schedule. The Company has the option to repurchase any unvested shares at the original purchase price upon any voluntary or involuntary termination. The shares purchased by the employees and non-employees pursuant to the early exercise of stock options are not deemed, for accounting purposes, to be outstanding or issued until those shares vest. The cash received in exchange for exercised and unvested shares related to stock options granted is recorded as a liability for the early exercise of stock options on the accompanying balance sheets and will be transferred into common stock and additional paid-in capital as the shares vest. As of June 30, 2020 and December 31, 2019, there were 14,768 shares and 29,579 shares subject to repurchase by the Company, respectively. As of June 30, 2020 and December 31, 2019, the Company recorded less than $0.1 million of liabilities associated with shares issued with repurchase rights.

Employee Stock Purchase Plan

In February 2020, the Company’s Board of Directors adopted, and its stockholders approved, the 2020 Employee Stock Purchase Plan (ESPP). The ESPP became effective in connection with the Company’s IPO however no offering period or purchase period under the ESPP will begin unless and until otherwise determined by the Company’s Board of Directors. A total of 290,000 shares of common stock were reserved for future issuance under the ESPP. Further, the number of shares of common stock available for issuance under the ESPP will automatically increase on the first day of each fiscal year following the fiscal year in which the first offering period under the ESPP commences in an amount equal to the lessor of (1) 500,000 shares, (2) 1% of the outstanding shares of the Company’s common stock on the last day of the immediately preceding fiscal year, or (3) such other amount as determined by the Company’s Board of Directors. As of June 30, 2020, no shares had been issued pursuant to the ESPP and there were no active offering periods or purchase periods.

Stock-Based Compensation Expense

Stock options are valued using the Black-Scholes Merton option pricing model on the date of grant. This option pricing model involves a number of estimates, including the expected lives of the stock options, the Company’s anticipated stock volatility and interest rates. Stock-based compensation expense is recognized using the ratable straight-line method over the vesting period. Forfeitures are recognized as they occur.

The Company determines the assumptions used in the option pricing model in the following manner:

•

Expected term. The expected term represents the period of time that options are expected to be outstanding. Because the Company does not have sufficient historical exercise behavior, it determines the expected life assumption using the simplified method which is an average of the contractual term of the option and its vesting period.

•

Expected volatility. Due to the Company’s limited historical stock price volatility data, the expected volatility assumption is based on volatilities of a peer group of similar companies whose share prices are publicly available. The peer group was developed based on companies in the biotechnology industry. The Company will continue to apply this process until a sufficient amount of historical information regarding the volatility of its own stock price becomes available.

•

Risk-free interest rate. The risk-free interest rate is based on the U.S. Treasury yield in effect at the time of grant for zero coupon U.S. Treasury notes with maturities similar to the expected term of the awards.

•

Expected dividend yield. The Company bases the expected dividend yield assumption on the fact that it has never paid cash dividends and has no present intention to pay cash dividends and, therefore, used an expected dividend yield of zero.

Prior to the Company’s IPO, the fair value of the Company’s common stock underlying the stock options was determined by the Board of Directors with assistance from management and, in part, on input from an independent third-party valuation firm. The Board of Directors determined the fair value of common stock by considering a number of objective and subjective factors, including valuations of comparable companies, sales of convertible preferred stock, operating and financial performance, the lack of liquidity of the Company’s common stock and the general and industry-specific economic outlook. Subsequent to the Company’s IPO, the fair value of the Company’s common stock is determined based on its closing market price.

The fair value of stock option awards to employees, executives, directors, and other service providers was estimated at the date of grant using the Black-Scholes Merton option pricing model with the following weighted-average assumptions.

	Six Months Ended June 30,
	2020	2019
Stock price	$16.00 - $35.92	$1.60
Risk-free interest rate	4.00% - 4.45%	2.58%
Expected volatility	88.01% - 88.06%	100.5%
Expected term (in years)	5.50 - 6.08	6.10
Expected dividend yield	0%	0%

The Company recognized stock-based compensation expense of $1.4 million and $0.2 million for the three months ended June 30, 2020 and 2019, respectively, and $1.9 million and $0.4 million for the six months ended June 30, 2020 and 2019, respectively. No stock-based compensation expense has been recognized as of June 30, 2020, pursuant to the Company’s ESPP. The total unrecognized compensation expense related to outstanding unvested stock-based awards as of June 30, 2020 and 2019 was $20.7 million and $2.1 million, respectively, which is expected to be recognized over a weighted-average remaining service period of 3.10 years for 2020 and 2019.

The table below summarizes the total stock-based compensation expense included in the Company’s statements of operations for stock options for the periods presented (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Research and development	$	541	$	59	$	814	$	117
General and administrative		840		131		1,094		264
Total Stock-Based Compensation Expense	$	1,381	$	190	$	1,908	$	381

Commitment and Contingencies

6 Months Ended

Jun. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

8. Commitments and Contingencies

Operating Leases

Rent expense is recorded on a straight-line basis over the term of the respective lease. Total rent expense for South San Francisco and San Diego locations was $0.3 million and $0.7 million for the three months and six months ended June 30, 2020 and 2019, respectively.

Future minimum lease payments under non-cancelable operating leases as of June 30, 2020 were as follows (in thousands):

	Operating Leases
2020 remaining six months	$	956
2021		1,871
2022		686
Total minimum lease payments	$	3,513

Litigation

From time to time, the Company may be involved in legal proceedings arising in the ordinary course of business. The Company believes there is no threatened litigation or litigation pending that could have, individually or in the aggregate, a material adverse effect on the Company’s financial position, results of operations or cash flows.

Subsequent Events

6 Months Ended

Jun. 30, 2020

Subsequent Events [Abstract]

Subsequent Events

9. Subsequent Events

On August 3, 2020, the Company entered into a license agreement (Mirati License Agreement) with Mirati Therapeutics, Inc, a Delaware corporation (“Mirati”). The Mirati License Agreement gives the Company access to Mirati’s preclinical stage core

polycomb repressive complex 2 protein (PRC2) program, including a lead product candidate now designated as ORIC-944. Under the Mirati License Agreement, Mirati granted the Company a worldwide, exclusive, sublicensable, royalty-free license under Mirati’s rights to certain patents and patent applications directed to certain small molecule compounds that bind to and inhibit PRC2 and certain related know-how, in each case, to develop and commercialize certain licensed compounds and licensed products incorporating any such compound. Under the Mirati License Agreement, the Company is wholly responsible for development and commercialization of licensed products. In addition, the Company is obligated to use commercially reasonable efforts to develop and commercialize at least one licensed product in certain major markets. For a limited period of time, both Mirati and the Company are prohibited from researching, developing or commercializing any other compound or product whose principal mechanism of action is to modulate or inhibit PRC2 by directly binding thereto.

The Company’s financial obligations under the Mirati License Agreement are comprised of an upfront payment of 588,235 shares of ORIC common stock issued pursuant to a stock issuance agreement (Stock Agreement) entered into between the parties on August 3, 2020. The number of shares issued pursuant to the Stock Agreement were based on a price of $34.00 per share, representing a premium of 10% to the 60-day trailing volume weighted average trading price of the Company’s common stock. The shares were issued in a private placement in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended, for transactions by an issuer not involving any public offering. During the eighteen month period following the date of the Stock Agreement, Mirati is subject to certain transfer restrictions, and the parties agreed to negotiate and enter into a registration rights agreement, with respect to the shares. The Company is not obligated to pay Mirati milestones or royalties.

Unless earlier terminated, the Mirati License Agreement will continue in effect on a country-by-country and licensed product-by-licensed product basis until the later of (a) the expiration of the last valid claim of a licensed patent covering such licensed product in such country or (b) ten years after the first commercial sale of such licensed product in such country. Following the expiration of the Mirati License Agreement, the Company will retain its licenses under the intellectual property Mirati licensed to it on a royalty-free basis. The Company and Mirati may each terminate the Mirati License Agreement if the other party materially breaches the terms of such agreement, subject to specified notice and cure provisions, or enters into bankruptcy or insolvency proceedings. Mirati may terminate the agreement if the Company challenges any of the patent rights licensed to the Company by Mirati or if the Company discontinues development of licensed products for a specified period of time. The Company also has the right to terminate the Mirati License Agreement without cause by providing prior written notice to Mirati.

If Mirati terminates the Mirati License Agreement, or the Company terminates the Mirati License Agreement without cause, then the Company is obligated to assign to Mirati, or grant an exclusive license to Mirati with respect to, certain of its patents, know-how and regulatory filings directed to licensed compounds and licensed products.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Basis of Presentation

Use of Estimates

Concentration of Credit Risk

Cash and Cash Equivalents

Research and Development Expenses and Accrued Research and Development Expenses

Deferred Offering Costs

Net Loss Per Share

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except share and per share amounts).

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Numerator
Net loss	$	(11,024	)	$	(5,965	)	$	(19,896	)	$	(11,980	)
Denominator
Weighted average shares outstanding used in computing net loss per share, basic and diluted		21,627,361			1,872,309			11,808,103			1,841,233
Net loss per share, basic and diluted	$	(0.51	)	$	(3.19	)	$	(1.68	)	$	(6.51	)

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Options to purchase common stock		3,947,577		1,801,095		3,947,577		1,801,095
Convertible preferred stock		—		18,838,843		—		18,838,843
Total		3,947,577		20,639,938		3,947,577		20,639,938

Recent Accounting Pronouncements

New Accounting Pronouncements Not Yet Adopted

Basis of Presentation and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2020

Accounting Policies [Abstract]

Summary of Computation of Basic and Diluted Net Loss Per Share

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except share and per share amounts).

	Three Months Ended June 30,						Six Months Ended June 30,
	2020			2019			2020			2019
Numerator
Net loss	$	(11,024	)	$	(5,965	)	$	(19,896	)	$	(11,980	)
Denominator
Weighted average shares outstanding used in computing net loss per share, basic and diluted		21,627,361			1,872,309			11,808,103			1,841,233
Net loss per share, basic and diluted	$	(0.51	)	$	(3.19	)	$	(1.68	)	$	(6.51	)

Summary of Outstanding Shares of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Options to purchase common stock		3,947,577		1,801,095		3,947,577		1,801,095
Convertible preferred stock		—		18,838,843		—		18,838,843
Total		3,947,577		20,639,938		3,947,577		20,639,938

Property and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2020

Property Plant And Equipment [Abstract]

Schedule of Property and Equipment, Net

Property and equipment, net consisted of the following (in thousands):

	June 30, 2020			December 31, 2019
Lab equipment	$	3,933		$	3,748
Leasehold improvements		1,710			1,710
Computer hardware and software		206			158
Furniture and fixtures		140			140
Total property and equipment, gross		5,989			5,756
Less accumulated depreciation		(4,011	)		(3,515	)
Total property and equipment, net	$	1,978		$	2,241

Accrued Other Liabilities (Tables)

6 Months Ended

Jun. 30, 2020

Accrued Liabilities Current [Abstract]

Schedule of Accrued Other Liabilities

Accrued other liabilities consisted of the following (in thousands):

	June 30, 2020		December 31, 2019
Accrued compensation	$	1,604	$	1,883
Accrued clinical development costs		901		484
Accrued manufacturing costs		569		479
Deferred rent - short-term		523		495
Accrued professional fees		447		338
Other accruals		345		279
Accrued deferred financing costs		—		1,244
Total accrued other liabilities	$	4,389	$	5,202

Convertible Preferred Stock (Tables)

6 Months Ended

Jun. 30, 2020

Temporary Equity Disclosure [Abstract]

Schedule of Convertible Preferred Stock Authorized and Issued and its Principal Terms

Convertible preferred stock authorized and issued and its principal terms as of December 31, 2019 consisted of the following (in thousands, except share and per share amounts):

	As of December 31, 2019
	Shares Authorized		Shares Issued and Outstanding		Issue Period	Issue Price per Share		Dividend Annual Rate per Share		Aggregate Liquidation Preference
Series A		3,862,500		3,862,500	2014 - 2015	$	4.00	$	0.32	$	15,450
Series B		6,750,000		6,749,999	2015 - 2016	$	8.00	$	0.64	$	54,000
Series C		4,448,788		4,448,780	2018 - 2019	$	12.00	$	0.96	$	53,385
Series D		5,287,500		4,217,327	2019	$	13.20	$	1.056	$	55,669
Total		20,348,788		19,278,606

Equity Incentive Plans and Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Option Activity

The following table summarizes the option activity for the six months ended June 30, 2020:

	Options			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2019		2,683,441		$	3.75
Granted		1,350,759			16.42
Exercised		(36,633	)		1.54
Forfeited and cancelled		(49,990	)		3.05
Outstanding at June 30, 2020		3,947,577		$	8.13		9.0	$	100,761
Exercisable at June 30, 2020		844,559		$	1.85		8.0	$	26,926

Summary of Fair Value of Stock Options Estimated Using Black-Scholes Merton Option Pricing Model Assumptions

	Six Months Ended June 30,
	2020	2019
Stock price	$16.00 - $35.92	$1.60
Risk-free interest rate	4.00% - 4.45%	2.58%
Expected volatility	88.01% - 88.06%	100.5%
Expected term (in years)	5.50 - 6.08	6.10
Expected dividend yield	0%	0%

Summary of Total Stock-based Compensation Expense

The table below summarizes the total stock-based compensation expense included in the Company’s statements of operations for stock options for the periods presented (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Research and development	$	541	$	59	$	814	$	117
General and administrative		840		131		1,094		264
Total Stock-Based Compensation Expense	$	1,381	$	190	$	1,908	$	381

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2020

Commitments And Contingencies Disclosure [Abstract]

Summary of Future Minimum Lease Payments under Non-cancelable Operating Leases

Future minimum lease payments under non-cancelable operating leases as of June 30, 2020 were as follows (in thousands):

	Operating Leases
2020 remaining six months	$	956
2021		1,871
2022		686
Total minimum lease payments	$	3,513

Description of the Business - Additional Information (Detail) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	Apr. 28, 2020 USD ($) $ / shares shares	Apr. 21, 2020	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Jun. 30, 2019 $ / shares
Description Of Business [Line Items]
Accumulated deficit			$ 112,586	$ 112,586	$ 92,690
Price per share of common stock \| $ / shares						$ 1.60
Gross proceeds from IPO excluding underwriting discounts and commissions and other offering expenses				$ 138,000
Maximum
Description Of Business [Line Items]
Price per share of common stock \| $ / shares			$ 35.92	$ 35.92
Minimum
Description Of Business [Line Items]
Price per share of common stock \| $ / shares			$ 16.00	$ 16.00
Common Stock
Description Of Business [Line Items]
Gross proceeds from IPO excluding underwriting discounts and commissions and other offering expenses	$ 138,000
Underwriting discounts and commissions and other offering expenses	12,800
Net proceeds from IPO	$ 125,200
Reverse stock split		one-for-four
Reverse stock split ratio		0.25
Common Stock \| Initial Public Offering
Description Of Business [Line Items]
Shares of common stock issued \| shares	8,625,000		8,625,000
Price per share of common stock \| $ / shares	$ 16.00
Convertible preferred stock outstanding converted into shares of common stock \| shares	19,278,606
Common Stock \| Option to Purchase Additional Shares \| Maximum
Description Of Business [Line Items]
Shares of common stock issued \| shares	1,125,000

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Liquid investments maturity period	90 days

Basis of Presentation and Summary of Significant Accounting Policies - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator
Net loss	$ (11,024)	$ (5,965)	$ (19,896)	$ (11,980)
Denominator
Weighted average shares outstanding used in computing net loss per share, basic and diluted	21,627,361	1,872,309	11,808,103	1,841,233
Net loss per share, basic and diluted	$ (0.51)	$ (3.19)	$ (1.68)	$ (6.51)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

Basis of Presentation and Summary of Significant Accounting Policies - Summary of Outstanding Shares of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive securities excluded from computation of net loss per share	3,947,577	20,639,938	3,947,577	20,639,938
Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive securities excluded from computation of net loss per share	3,947,577	1,801,095	3,947,577	1,801,095
Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti dilutive securities excluded from computation of net loss per share		18,838,843		18,838,843

Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 5,989	$ 5,756
Less accumulated depreciation	(4,011)	(3,515)
Total property and equipment, net	1,978	2,241
Lab Equipment
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	3,933	3,748
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	1,710	1,710
Computer Hardware and Software
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	206	158
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment, gross	$ 140	$ 140

Accrued Other Liabilities - Schedule of Accrued Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accrued Liabilities Current [Abstract]
Accrued compensation	$ 1,604	$ 1,883
Accrued clinical development costs	901	484
Accrued manufacturing costs	569	479
Deferred rent - short-term	523	495
Accrued professional fees	447	338
Other accruals	345	279
Accrued deferred financing costs		1,244
Total accrued other liabilities	$ 4,389	$ 5,202

Fair Value Measurements - Additional Information (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents, at carrying value	$ 196,642,000	$ 89,159,000
Level 1 \| Money Market Funds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash and cash equivalents, at carrying value	196,600,000	88,100,000
Cash and cash equivalents, fair value	196,600,000	88,100,000
Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value disclosure	0	0
Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Assets, fair value disclosure	$ 0	$ 0

Convertible Preferred Stock - Schedule of Convertible Preferred Stock Authorized and Issued and its Principal Terms (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Apr. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Temporary Equity [Line Items]
Shares Authorized	20,348,788
Shares Issued	19,278,606
Shares Outstanding	19,278,606		0
Series A Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	3,862,500	0
Shares Issued	3,862,500	0
Shares Outstanding	3,862,500	0		3,862,500	3,862,500	3,862,500	3,862,500
Issue Price per Share	$ 4.00
Dividend Annual Rate per Share	$ 0.32
Aggregate Liquidation Preference	$ 15,450	$ 0
Series A Convertible Preferred Stock \| Minimum
Temporary Equity [Line Items]
Issue Period	2014
Series A Convertible Preferred Stock \| Maximum
Temporary Equity [Line Items]
Issue Period	2015
Series B Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	6,750,000	0
Shares Issued	6,749,999
Shares Outstanding	6,749,999	0		6,749,999	6,749,999	6,749,999	6,749,999
Issue Price per Share	$ 8.00
Dividend Annual Rate per Share	$ 0.64
Aggregate Liquidation Preference	$ 54,000	$ 0
Series B Convertible Preferred Stock \| Minimum
Temporary Equity [Line Items]
Issue Period	2015
Series B Convertible Preferred Stock \| Maximum
Temporary Equity [Line Items]
Issue Period	2016
Series C Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	4,448,788	0
Shares Issued	4,448,780
Shares Outstanding	4,448,780	0		4,448,780	4,448,780	4,448,780	3,177,271
Issue Price per Share	$ 12.00
Dividend Annual Rate per Share	$ 0.96
Aggregate Liquidation Preference	$ 53,385	$ 0
Series C Convertible Preferred Stock \| Minimum
Temporary Equity [Line Items]
Issue Period	2018
Series C Convertible Preferred Stock \| Maximum
Temporary Equity [Line Items]
Issue Period	2019
Series D Convertible Preferred Stock
Temporary Equity [Line Items]
Shares Authorized	5,287,500	0
Shares Issued	4,217,327
Shares Outstanding	4,217,327	0		4,217,327	3,777,564
Issue Period	2019
Issue Price per Share	$ 13.20
Dividend Annual Rate per Share	$ 1.056
Aggregate Liquidation Preference	$ 55,669	$ 0

Convertible Preferred Stock - Additional Information (Details) - shares	Apr. 30, 2020	Dec. 31, 2019
Temporary Equity Disclosure [Abstract]
Outstanding shares of convertible preferred stock converted into shares of common stock	19,278,606
Convertible preferred stock, outstanding	0	19,278,606

Equity Incentive Plans and Stock-Based Compensation - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Apr. 30, 2020	Oct. 31, 2014	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares subject to repurchase			14,768		14,768		29,579
Expected dividend yield					0.00%	0.00%
Stock-based compensation expense			$ 1,381,000	$ 190,000	$ 1,908,000	$ 381,000
Total unrecognized compensation expense related to outstanding unvested stock-based awards			20,700,000	$ 2,100,000	$ 20,700,000	$ 2,100,000
Total unrecognized compensation expense related to outstanding unvested stock-based awards expected to be recognized over weighted-average remaining service period					3 years 1 month 6 days	3 years 1 month 6 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Liabilities with shares issued with repurchase rights			$ 100,000		$ 100,000		$ 100,000
2020 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock initially reserved for issuance	2,656,500
Additional number of shares available for future issuance	2,656,500
Percentage of outstanding shares of common stock	5.00%
Number of shares available for future issuance			1,559,427		1,559,427
2014 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock remained available for issuance	241,653
Number of shares available for future issuance							203,696
2020 Plan and 2014 Plan \| Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period		4 years
2020 Plan and 2014 Plan \| Stock Options \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period		10 years
2020 Plan and 2014 Plan \| Incentive Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price as a percentage of fair market value		100.00%
Minimum percentage required for holders of combined voting power to be eligible for incentive stock options		10.00%
Percentage of options may not be granted at less than fair market value of the common stock at the date of grant		110.00%
Maximum term of options may not be granted at less than fair market value of the common stock at the date of grant		5 years
2020 ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional number of shares available for future issuance	500,000
Percentage of outstanding shares of common stock	1.00%
Number of shares available for future issuance	290,000
Number of shares issued under ESPP	0

Equity Incentive Plans and Stock-Based Compensation - Summary of Option Activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Options outstanding, Beginning Balance \| shares	2,683,441
Options, Granted \| shares	1,350,759
Options, Exercised \| shares	(36,633)
Options, Forfeited and cancelled \| shares	(49,990)
Options outstanding, Ending Balance \| shares	3,947,577
Options, Exercisable \| shares	844,559
Weighted Average Exercise Price, Options outstanding Beginning Balance \| $ / shares	$ 3.75
Weighted Average Exercise Price, Granted \| $ / shares	16.42
Weighted Average Exercise Price, Exercised \| $ / shares	1.54
Weighted Average Exercise Price, Forfeited and Cancelled \| $ / shares	3.05
Weighted Average Exercise Price, Options outstanding Ending Balance \| $ / shares	8.13
Weighted Average Exercise Price, Exercisable \| $ / shares	$ 1.85
Weighted Average Remaining Contractual Term (in years), Options outstanding	9 years
Weighted Average Remaining Contractual Term (in years), Exercisable	8 years
Aggregate Intrinsic Value, Options outstanding \| $	$ 100,761
Aggregate Intrinsic Value, Exercisable \| $	$ 26,926

Equity Incentive Plans and Stock-Based Compensation - Summary of Fair Value of Stock Options Estimated Using Black-Scholes Merton Option Pricing Model Assumptions (Details) - $ / shares	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price		$ 1.60
Risk-free interest rate		2.58%
Risk-free interest rate, minimum	4.00%
Risk-free interest rate, maximum	4.45%
Expected volatility		100.50%
Expected volatility, minimum	88.01%
Expected volatility, maximum	88.06%
Expected term (in years)		6 years 1 month 6 days
Expected dividend yield	0.00%	0.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price	$ 16.00
Expected term (in years)	5 years 6 months
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price	$ 35.92
Expected term (in years)	6 years 29 days

Equity Incentive Plans and Stock-Based Compensation - Summary of Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,381	$ 190	$ 1,908	$ 381
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	541	59	814	117
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 840	$ 131	$ 1,094	$ 264

Commitment and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
South San Francisco and San Diego Locations
Loss Contingencies [Line Items]
Total rent expense	$ 0.3	$ 0.7	$ 0.3	$ 0.7

Commitment and Contingencies - Summary of Future Minimum Lease Payments Under Non-cancelable Operating Leases (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2020 remaining six months	$ 956
2021	1,871
2022	686
Total minimum lease payments	$ 3,513

Subsequent Events - Additional Information (Detail)	Aug. 03, 2020 Product $ / shares shares	Jun. 30, 2020 shares	Dec. 31, 2019 shares
Subsequent Event [Line Items]
Upfront payment shares issued		29,924,461	1,984,222
Subsequent Event
Subsequent Event [Line Items]
Number of licensed products obliged to develop and commercialize \| Product	1
Subsequent Event \| Mirati Therapeutics, Inc
Subsequent Event [Line Items]
Number of period the agreement in effect	10 years
Subsequent Event \| Private Placement \| Mirati Therapeutics, Inc \| Common Stock
Subsequent Event [Line Items]
Upfront payment shares issued	588,235
Issue Price per Share \| $ / shares	$ 34.00
Premium percentage	10.00%
Stock transfer restrictions period	18 months