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Stock Option Plan (Tables) | 6 Months Ended
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Jun. 30, 2022
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, 2021 |  | 2,014,330 |  |  | $ | 12.10 |  |  | 7.87 |  | $ | 5,428 |
Granted |  | 63,000 |  |  | $ | 5.25 |  |  |  |  |
Forfeited |  | (102,110) |  |  | $ | 13.79 |  |  |  |  |
Expired |  | (25,846) |  |  | $ | 14.39 |  |  |  |  |
Outstanding, June 30, 2022 |  | 1,949,374 |  |  | $ | 11.76 |  |  | 7.00 |  | $ | 2,611 |
Vested and expected to vest, June 30, 2022 |  | 1,949,374 |  |  | $ | 11.76 |  |  | 7.00 |  | $ | 2,611 |
Options exercisable, June 30, 2022 |  | 1,334,116 |  |  | $ | 10.76 |  |  | 6.55 |  | $ | 2,365 |
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, 2021 |  | 415,325 |  |  | $ | 16.54 |  |  | $ | 4,830 |
Awards granted |  | 540,225 |  |  | $ | 8.66 |  |  |
Awards released |  | (90,821) |  |  | $ | 17.05 |  |  |
Awards canceled |  | (79,789) |  |  | $ | 11.96 |  |  |
Outstanding, June 30, 2022 |  | 784,940 |  |  | $ | 11.53 |  |  | $ | 4,506 |
Schedule of Fair Value Assumptions, Stock Options | The fair value of employee stock options was estimated using the following assumptions to determine the fair value of stock options granted:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Expected volatility |  | 54% |  | 83% |  | 54% |  | 83%-84%
Risk-free interest rate |  | 3.4% |  | 1.1% |  | 3.4% |  | 0.8%-1.1%
Dividend yield |  | — |  | — |  | — |  | —
Expected term (in years) |  | 5.50 |  | 5.50-6.08 |  | 5.50 |  | 5.50-6.08
Schedule of Fair Value Assumptions, Employee Stock Purchase Plan | The following assumptions were used to calculate the stock-based compensation for each stock purchase right granted under the ESPP:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Expected volatility |  | 45% |  | 60% |  | 45% |  | 60%
Risk-free interest rate |  | 0.6% |  | 0.1% |  | 0.6% |  | 0.1%
Dividend yield |  | — |  | — |  | — |  | —
Expected term (in years) |  | 0.50 |  | 0.50 |  | 0.50 |  | 0.50
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,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Costs of revenue |  | $ | 59 |  |  | $ | 61 |  |  | $ | 103 |  |  | $ | 72 |
Selling, general and administrative |  | 1,203 |  |  | 1,049 |  |  | 2,321 |  |  | 1,840 |
Research and development |  | 178 |  |  | 175 |  |  | 392 |  |  | 285 |
Total |  | $ | 1,440 |  |  | $ | 1,285 |  |  | $ | 2,816 |  |  | $ | 2,197 |

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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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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