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Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 shares | Nov. 30, 2015 | Dec. 31, 2020 USD ($) Segment Agreement | Dec. 31, 2019 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of operating segments | Segment |  |  | 1 |
Maturity days for highly liquid investments |  |  | The Company considers all short-term, highly liquid investments with original maturities of 90 days or less at acquisition date to be cash equivalents. |
Restricted cash |  |  | $ 878,000 | $ 878,000
Operating lease option to extent |  |  | true |
Operating lease option to terminate |  | true | true |
Impairment loss of long lived assets |  |  | $ 0 | 0
Conversion of convertible preferred stock into common stock upon initial public offering, shares | shares | 61,992,534 |  |  |
Description of Income tax benefit, likelihood of realized upon ultimate settlement |  |  | greater than 50% |
Laboratory and Computer Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment, useful life |  |  | 3 years |
Furniture and Fixtures [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property and equipment, useful life |  |  | 5 years |
Genentech [Member] | Genentech Agreement [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Number of collaboration and license agreement | Agreement |  |  | 1 |
Collaboration and license agreement entered date |  |  | Dec. 11, 2020 |
Letter of Credit [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash |  |  | $ 878,000 | $ 878,000

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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