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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 |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Research and development |  | $ | 858 |  |  | $ | 134 |  |  | $ | 3,861 |  |  | $ | 364 |
General and administrative |  |  | 1,567 |  |  |  | 75 |  |  |  | 6,084 |  |  |  | 190 |
Total stock-based compensation |  | $ | 2,425 |  |  | $ | 209 |  |  | $ | 9,945 |  |  | $ | 554 |
Schedule of outstanding common stock options and related activity |
Equity |  | Number of Options |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Term (Years) |  |  | Intrinsic Value |
Outstanding - December 31, 2020 |  |  | 7,032,591 |  |  | $ | 0.97 |  |  |  | 5.34 |  |  | $ | 62,462 |
Granted |  |  | 2,574,441 |  |  |  | 8.85 |  |  |  | 9.61 |  |  |  | - |
Exercised |  |  | (409,867 | ) |  |  | 1.04 |  |  |  | - |  |  |  | 2,373 |
Forfeited |  |  | (133,742 | ) |  |  | 8.66 |  |  |  | - |  |  |  | - |
Outstanding - September 30, 2021 |  |  | 9,063,423 |  |  | $ | 3.09 |  |  |  | 5.90 |  |  | $ | 38,863 |
Options vested and exercisable - September 30, 2021 |  |  | 6,000,723 |  |  | $ | 0.82 |  |  |  | 4.33 |  |  | $ | 36,247 |
Stock options vested and expected to vest - September 30, 2021 |  |  | 9,063,423 |  |  | $ | 3.09 |  |  |  | 5.90 |  |  | $ | 38,863 |
Schedule of assumptions used to calculate the fair value of stock options |
|  | Nine months ended September 30, 2021 |
Expected stock price volatility |  |  | 84.8 – 87.4% |
Risk-free interest rate |  |  | 0.59 – 0.94% |
Expected dividend yield |  |  | 0.00% |
Expected term |  |  | 6.00 years |
Schedule of restricted common stock activity |
|  | Number of Restricted Stock Awards |  |  | Weighted- Average Grant Date Fair Value |
Outstanding and unvested balance as of December 31, 2020 |  |  | 1,507,062 |  |  | $ | 10.30 |
Converted to shares of Common Stock upon vesting |  |  | (224,109 | ) |  |  | - |
Forfeited |  |  | (37,464 | ) |  |  | 10.82 |
Outstanding and unvested balance as of September 30, 2021 |  |  | 1,245,489 |  |  | $ | 10.14 |

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- Definition Tabular disclosure of activity for outstanding award under share-based payment arrangement excluding share and unit options and nonvested award. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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