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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Shares of Common Stock Reserved for Issuance | Shares of common stock reserved for issuance under the Company’s equity incentive plans were as follows:
|  | March 31, 2024 |
Outstanding stock awards |  |  | 9,261,193 |
Reserved for future award grants |  |  | 5,528,052 |
Reserved for future ESPP |  |  | 583,756 |
Total common stock reserved for stock awards |  |  | 15,373,001 |
Service-Based
Summary of Stock Option Activity | A summary of the Company’s service-based stock option activity (excluding performance-based stock option activity, which is presented separately below) for the three months ended March 31, 2024 is as follows:
|  | Outstanding Service-Based Options |
(in thousands, except share and per share data) |  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Balance—December 31, 2023 |  |  | 5,805,586 |  |  | $ | 7.40 |  |  |  | 6.90 |  |  | $ | 64 |
Options granted |  |  | 2,400,500 |  |  |  | 1.59 |  |  |  |  |  |  |
Options exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |
Options forfeited or expired |  |  | (256,904 | ) |  |  | 7.60 |  |  |  |  |  |  |
Balance—March 31, 2024 |  |  | 7,949,182 |  |  | $ | 5.64 |  |  |  | 7.85 |  |  | $ | 46 |
Options vested and exercisable as of March 31, 2024 |  |  | 3,321,228 |  |  | $ | 9.62 |  |  |  | 5.72 |  |  | $ | — |
Summary of Weighted-average Assumptions Used in Determination of Fair Value of Stock Options |
|  | Three Months Ended March 31,
|  | 2024 |  | 2023
Expected term (in years) |  | 5.50 - 6.08 |  | 5.77
Volatility |  | 72.63 - 80.28% |  | 78.98%
Risk-free interest rate |  | 3.88 - 4.33% |  | 3.58%
Dividend yield |  | –% |  | –%
Summary of Restricted Stock Units Activity | A summary of the Company’s RSU activity for the three months ended March 31, 2024 is as follows:
|  | Unvested Restricted Stock Units |
(in thousands, except share and per share data) |  | Number of Shares |  |  | Weighted- Average Grant Date Fair Value |  |  | Aggregate Fair Value |
Balance—December 31, 2023 |  |  | 1,253,826 |  |  | $ | 8.99 |  |  | $ | 2,633 |
RSUs granted |  |  | — |  |  |  | — |  |  |  |
RSUs vested |  |  | (33,505 | ) |  |  | 26.87 |  |  |  | 49 |
RSUs forfeited |  |  | (172,810 | ) |  |  | 9.45 |  |  |  |
Balance—March 31, 2024 |  |  | 1,047,511 |  |  | $ | 8.34 |  |  | $ | 1,561 |
Stock Based Compensation Expense by Award Type and Function | The following is a summary of stock-based compensation expense by award type (in thousands):
|  | Three Months Ended March 31, |
|  | 2024 |  |  | 2023 |
Service-based stock options |  | $ | 1,215 |  |  | $ | 1,343 |
Performance-based stock options |  |  | 6 |  |  |  | — |
RSUs |  |  | 1,408 |  |  |  | 2,123 |
ESPP |  |  | 58 |  |  |  | 229 |
Total stock-based compensation expense |  | $ | 2,687 |  |  | $ | 3,695 |
The following is a summary of stock-based compensation expense by function (in thousands):
|  | Three Months Ended March 31, |
|  | 2024 |  |  | 2023 |
Cost of revenue |  | $ | 154 |  |  | $ | 490 |
Research and development |  |  | 947 |  |  |  | 1,245 |
Selling, general and administrative |  |  | 1,586 |  |  |  | 1,960 |
Total stock-based compensation expense |  | $ | 2,687 |  |  | $ | 3,695 |
2019 Employee Stock Purchase Plan | Performance-Based Stock Option |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Summary of Stock Option Activity | A summary of the Company's performance-based stock option activity for the three months ended March 31, 2024 is as follows:
|  | Outstanding Performance-Based Options |
(in thousands, except share and per share data) |  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value |
Balance—December 31, 2023 |  |  | — |  |  | $ | — |  |  |  | — |  |  | $ | — |
Options granted |  |  | 264,500 |  |  |  | 1.61 |  |  |  |  |  |  |
Balance—March 31, 2024 |  |  | 264,500 |  |  | $ | 1.61 |  |  |  | 9.96 |  |  | $ | — |
Options vested and exercisable as of March 31, 2024 |  |  | — |  |  |  |  |  |  |  |  |  |

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