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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Share-Based Payment Arrangement, Option, Activity | The following table summarizes the Company’s stock option activity and related information under all equity plans, excluding performance and market awards:
|  | Number of Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2022 |  | 4,191,426 |  |  | $ | 3.18 |  |  | 9.1 |  | $ | 6 |
Granted |  | 2,794,596 |  |  | $ | 1.64 |  |  |  |  |
Forfeited |  | (411,588) |  |  | $ | 3.55 |  |  |  |  |
Outstanding at June 30, 2023 |  | 6,574,434 |  |  | $ | 2.50 |  |  | 9.0 |  | $ | 2 |
Vested and exercisable at June 30, 2023 |  | 1,247,904 |  |  | $ | 3.63 |  |  | 7.9 |  | $ | 2 |
Share-Based Payment Arrangement, Outstanding Award, Activity, Excluding Option |
|  | Number of Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2022 |  | 5,368,501 |  |  | $ | 9.92 |  |  | 9.0 |  | $ | — |
Forfeited |  | (201,952) |  |  | $ | 9.92 |  |  |  |  |
Outstanding at June 30, 2023 |  | 5,166,549 |  |  | $ | 9.92 |  |  | 8.4 |  | $ | — |
Vested and exercisable at June 30, 2023 |  | 1,436,378 |  |  | $ | 9.92 |  |  | 8.1 |  | $ | — |
The following table summarizes the Company’s restricted stock units activity and related information under all equity plans:
|  | Number of Restricted Stock Units |  | Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2022 |  | 447,948 |  |  | $ | 2.50 |
Forfeited |  | (112,064) |  |  | $ | 2.50 |
Outstanding at June 30, 2023 |  | 335,884 |  |  | $ | 2.50 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions | The assumptions used to determine the grant date fair value of non-market based, stock options granted were as follows, presented on a weighted-average basis:
|  | Six Months Ended June 30,
|  | 2023 |  | 2022
Expected term (in years) |  | 5.9 |  | 5.8
Expected volatility |  | 83% |  | 78%
Risk-free interest rate |  | 3.5% |  | 3.0%
Dividend yield |  | — |  | —
Share-Based Payment Arrangement, Expensed and Capitalized, Amount | Total stock-based compensation expense was as follows (in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2023 |  | 2022 |  | 2023 |  | 2022
General and administrative |  | $ | 3,081 |  |  | $ | 7,863 |  |  | $ | 6,320 |  |  | $ | 8,322 |
Research and development |  | 353 |  |  | 1,362 |  |  | 877 |  |  | 1,564 |
Total stock-based compensation expense |  | $ | 3,434 |  |  | $ | 9,225 |  |  | $ | 7,197 |  |  | $ | 9,886 |

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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 -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + 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 -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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