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Stock Option Plan (Tables) | 9 Months Ended
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Sep. 30, 2021
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
Outstanding, December 31, 2020 |  | 1,975,761 |  |  | $ | 11.81 |  |  | 8.71 |  | $ | 6,750 |
Granted |  | 229,850 |  |  | $ | 16.79 |  |  |  |  |
Exercised |  | (11,188) |  |  | $ | 7.13 |  |  |  |  |
Forfeited |  | (122,435) |  |  | $ | 14.49 |  |  |  |  |
Expired |  | (4,931) |  |  | $ | 21.50 |  |  |  |  |
Outstanding, September 30, 2021 |  | 2,067,057 |  |  | $ | 12.20 |  |  | 8.14 |  | $ | 6,956 |
Vested and expected to vest, September 30, 2021 |  | 2,067,057 |  |  | $ | 12.20 |  |  | 8.14 |  | $ | 6,956 |
Options exercisable, September 30, 2021 |  | 979,111 |  |  | $ | 10.30 |  |  | 7.77 |  | $ | 4,794 |
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
Outstanding, December 31, 2020 |  | — |  |  | $ | — |  |  | $ | — |
Awards granted |  | 422,150 |  |  | $ | 16.81 |  |  |
Awards released |  | — |  |  | $ | — |  |  |
Awards canceled |  | (19,050) |  |  | $ | 16.28 |  |  |
Outstanding, September 30, 2021 |  | 403,100 |  |  | $ | 16.84 |  |  | $ | 5,482 |
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 September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Expected volatility |  | 86% |  | 52% |  | 83%-86% |  | 47%-52%
Risk-free interest rate |  | 0.9% |  | 0.4% |  | 0.8%-1.1% |  | 0.4%-1.7%
Dividend yield |  | — |  | — |  | — |  | —
Expected term (in years) |  | 5.77 |  | 6.08 |  | 5.50-6.08 |  | 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 September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Expected volatility |  | 45% |  | 83% |  | 45%-60% |  | 58%-83%
Risk-free interest rate |  | 0.1% |  | 0.1% |  | 0.1% |  | 0.1%-1.1%
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 statement of operations is as follows (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenue |  | $ | 64 |  |  | $ | 9 |  |  | $ | 136 |  |  | $ | 21 |
Selling, general and administrative |  | 1,115 |  |  | 710 |  |  | 2,955 |  |  | 1,696 |
Research and development |  | 175 |  |  | 80 |  |  | 460 |  |  | 160 |
Total |  | $ | 1,354 |  |  | $ | 799 |  |  | $ | 3,551 |  |  | $ | 1,877 |

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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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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- 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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