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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted-average assumptions used in determining the fair value of stock options granted were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Volatility | 83.8 | % |  | 79.6 | % |  | 78.6 | % |  | 78.9 | %
Risk-free interest rate | 3.25 | % |  | 1.12 | % |  | 1.92 | % |  | 1.16 | %
Expected life (years) | 6.25 |  | 6.25 |  | 6.19 |  | 6.25
Dividend yield rate | — | % |  | — | % |  | — | % |  | — | %
Share-based Compensation, Stock Options, Activity | A summary of stock option activity for the nine months ended September 30, 2022, is presented below:
|  |  |  |  | Weighted |  |  |
|  |  | Weighted |  | Average |  |  |
|  |  | Average |  | Remaining |  | Aggregate |
| Stock |  | Exercise |  | Contractual |  | Intrinsic |
| Options |  | Per Share |  | Terms (Years) |  | Value |
Outstanding, December 31, 2021 | 3,922,286 |  |  | $ | 11.23 |  |  | 7.10 |  | $ | 455 |  |
Granted | 1,665,786 |  |  | 6.74 |  |  |  |  |  |
Exercised | (53,098) |  |  | 10.08 |  |  |  |  |  |
Canceled/forfeited | (602,342) |  |  | 14.17 |  |  |  |  |  |
Outstanding, September 30, 2022 | 4,932,632 |  |  | $ | 9.37 |  |  | 7.23 |  | $ | 4,245 |  |
Exercisable, September 30, 2022 | 2,860,912 |  |  | $ | 10.35 |  |  | 6.01 |  | $ | 1,338 |  |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity | A summary of RSU activity for the nine months ended September 30, 2022, is presented below:
|  |  | Weighted Average
|  |  | Grant Date
| Restricted |  | Fair Value
| Stock Units |  | Per Share
Outstanding, December 31, 2021 | 1,926,467 |  |  | $ | 8.06 |
Granted | 1,667,320 |  |  | 6.88 |
Vested | (553,328) |  |  | 8.22 |
Forfeited | (401,656) |  |  | 6.88 |
Outstanding, September 30, 2022 | 2,638,803 |  |  | $ | 7.46 |
Schedule of Stock-based Compensation Expense Allocation | The following table summarizes stock-based compensation expense:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Selling, general and administrative | $ | 2,398 |  |  | $ | 2,399 |  |  | $ | 8,236 |  |  | $ | 6,784 |
Research and development | 85 |  |  | 77 |  |  | 185 |  |  | 143 |
| $ | 2,483 |  |  | $ | 2,476 |  |  | $ | 8,421 |  |  | $ | 6,927 |

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