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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-based Compensation Expense by Classification | Stock-based compensation expense by classification included with in the condensed consolidated statements of operations and comprehensive loss was as follows (in thousands):
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Research and development |  | $ | 2,673 |  |  | $ | 1,965 |  |  | $ | 12,615 |  |  | $ | 9,033 |
General and administrative |  |  | 10,369 |  |  |  | 7,783 |  |  |  | 28,408 |  |  |  | 11,257 |
Total stock-based compensation expense |  | $ | 13,042 |  |  | $ | 9,748 |  |  | $ | 41,023 |  |  | $ | 20,290 |
Summary of RSA Activity | A summary of the Company’s RSAs activity was as follows:
|  | Number of Shares |  |  | Weighted-Average Value at Grant Date Per Share |
Unvested shares as of December 31, 2020 |  |  | 7,562,503 |  |  | $ | 0.0001 |
Vested |  |  | (3,968,751 | ) |  | $ | 0.0001 |
Forfeited |  |  | (18,750 | ) |  | $ | 0.0001 |
Unvested shares as of September 30, 2021 |  |  | 3,575,002 |  |  | $ | 0.0001 |
Summary of Stock Option Activity | A summary of the Company’s stock option activity was as follows:
|  | Number of Stock Options |  |  | Weighted- Average Exercise Price Per Share |  |  | Weighted- Average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value (in thousands) |
Options outstanding as of December 31, 2020 |  |  | 34,413,889 |  |  | $ | 3.33 |  |  |  |  |  |  |
Granted |  |  | 12,521,501 |  |  | $ | 9.00 |  |  |  |  |  |  |
Exercised |  |  | (776,449 | ) |  | $ | 2.63 |  |  |  |  |  |  |
Canceled or forfeited |  |  | (2,597,874 | ) |  | $ | 4.00 |  |  |  |  |  |  |
Options outstanding as of September 30, 2021 |  |  | 43,561,067 |  |  | $ | 4.93 |  |  |  | 7.97 |  |  | $ | 432,916 |
Options exercisable as of September 30, 2021 |  |  | 24,397,665 |  |  | $ | 3.29 |  |  |  | 7.17 |  |  | $ | 280,840 |
Schedule of Assumptions Used in Black-Scholes Option-Pricing Model for Estimating Fair Value of Stock Options Granted | The fair value of stock options granted to employees, directors and consultants was estimated on the date of grant using the Black-Scholes option pricing model using the following weighted-average assumptions:
|  | Nine Months Ended September 30,
|  | 2021 |  | 2020
Risk-free interest rate |  | 0.79% |  | 0.99%
Expected volatility |  | 79% |  | 75%
Expected term (in years) |  | 6.10 |  | 6.25
Expected dividend yield |  | 0% |  | 0%

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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