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Stock Option Plan (Tables) | 6 Months Ended
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Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock Option Activity | Stock option activity under the Company's 2019 Plan is set forth below:
|  | Number of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2022 |  | 1,421,235 |  |  | $ | 12.94 |  |  | 7.09 |  | $ | 483 |
Granted |  | 58,500 |  |  | $ | 3.15 |  |  |  |  |
Exercised |  | (93,335) |  |  | $ | 0.26 |  |  |  |  |
Forfeited |  | (32,426) |  |  | $ | 14.38 |  |  |  |  |
Expired |  | (359,448) |  |  | $ | 17.02 |  |  |  |  |
Outstanding, June 30, 2023 |  | 994,526 |  |  | $ | 12.03 |  |  | 6.90 |  | $ | 349 |
Vested and expected to vest, June 30, 2023 |  | 994,526 |  |  | $ | 12.03 |  |  | 6.90 |  | $ | 349 |
Options exercisable, June 30, 2023 |  | 825,513 |  |  | $ | 12.24 |  |  | 6.66 |  | $ | 349 |
Schedule of Restricted Stock Unit Activity | Restricted stock unit activity under the Company's 2019 Plan is set forth below:
|  | Number of Shares |  | Weighted- Average Grant Date Fair Value |  | Aggregate Intrinsic Value (in thousands)
Outstanding, December 31, 2022 |  | 1,036,208 |  |  | $ | 7.28 |  |  | $ | 2,487 |
Awards granted |  | 796,400 |  |  | $ | 2.42 |  |  |
Awards released |  | (144,985) |  |  | $ | 12.01 |  |  |
Awards canceled |  | (89,045) |  |  | $ | 9.53 |  |  |
Outstanding, June 30, 2023 |  | 1,598,578 |  |  | $ | 4.30 |  |  | $ | 4,636 |
Schedule of Non-cash Stock-based Compensation Expense | Total non-cash stock-based compensation expense recorded related to options granted, restricted stock units granted and stock purchase rights granted under the ESPP in the condensed statements of operations is as follows (in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2023 |  | 2022 |  | 2023 |  | 2022
Costs of revenue |  | $ | 63 |  |  | $ | 59 |  |  | $ | 116 |  |  | $ | 103 |
Selling, general and administrative |  | 874 |  |  | 1,203 |  |  | 1,705 |  |  | 2,321 |
Research and development |  | 41 |  |  | 178 |  |  | 143 |  |  | 392 |
Total |  | $ | 978 |  |  | $ | 1,440 |  |  | $ | 1,964 |  |  | $ | 2,816 |

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