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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Schedule of Key Assumptions Used to Determine Fair Value of Options Granted | The weighted-averages for assumptions used in determining the fair value of stock options granted were as follows:
| Year Ended December 31,
| 2021 |  | 2020
Volatility | 78.9% |  | 61.2%
Risk-free interest rate | 1.2% |  | 1.4%
Expected life (years) | 6.25 |  | 6.14
Dividend yield rate | —% |  | —%
Schedule of Stock Options Activity | A summary of stock option activity under the Plan for the year ended December 31, 2021 and 2020, is presented below:
|  |  |  |  | Weighted |  |  |
|  |  | Weighted |  | Average |  |  |
|  |  | Average |  | Remaining |  | Aggregate |
| Stock |  | Exercise |  | Contractual |  | Intrinsic |
| Options |  | Per Share |  | Terms (Years) |  | Value |
Outstanding as of December 31, 2019 | 3,977,401 |  |  | 14.07 |  |  | 8.51 |  | $ | 7,198 |  |
Granted | 1,322,119 |  |  | 8.89 |  |  |  |  |  |
Exercised | — |  |  |  |  |  |  |  |
Cancelled/forfeited | (892,022) |  |  | 15.62 |  |  |  |  |  |
Outstanding as of December 31, 2020 | 4,407,498 |  |  | $ | 12.20 |  |  | 7.66 |  | $ | 50 |  |
Granted | 357,125 |  |  | 9.18 |  |  |  |  |  |
Exercised | (99,435) |  |  | 9.81 |  |  |  |  |  |
Cancelled/forfeited | (742,902) |  |  | 16.21 |  |  |  |  |  |
Outstanding as of December 31, 2021 | 3,922,286 |  |  | $ | 11.23 |  |  | 7.10 |  | $ | 455 |  |
Exercisable as of December 31, 2021 | 2,316,637 |  |  | $ | 11.44 |  |  | 6.67 |  | $ | 98 |  |
Vested and expected to vest as of December 31, 2021 | 3,922,286 |  |  | $ | 11.23 |  |  | 7.10 |  | $ | 455 |  |
Schedule of RSUs Activity | A summary of RSU activity under the Plan for the year ended December 31, 2021 and 2020, is presented below:
|  |  | Weighted
| Restricted |  | Average
| Stock |  | Grant Date
| Units |  | Fair Value
Outstanding as of December 31, 2019 | 229,870 |  |  | $ | 15.89 |
Granted | 1,301,439 |  |  | 5.88 |
Vested | (186,870) |  |  | 13.6 |
Forfeited | (170,698) |  |  | 7.21 |
Outstanding as of December 31, 2020 | 1,173,741 |  |  | $ | 6.42 |
Granted | 1,850,243 |  |  | 7.94 |
Vested | (566,788) |  |  | 5.08 |
Forfeited | (530,729) |  |  | 7.22 |
Outstanding as of December 31, 2021 | 1,926,467 |  |  | $ | 8.06 |
Schedule of Stock-based Compensation Expense | The following table summarizes stock-based compensation expense arising from the above Plan:
| Year Ended December 31,
| 2021 |  | 2020
Selling, general and administrative | $ | 9,372 |  |  | $ | 10,408 |
Research and development | 204 |  |  | 176 |
Total stock-based compensation expense | $ | 9,576 |  |  | $ | 10,584 |

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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 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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