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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Assumptions used in Estimation of Fair Value of the Share-based Payment Awards on the Grant Date |
|  | Year Ended
|  | December 31,
|  | 2021 |  | 2020
Risk-free interest rate |  | 1.22% - 1.47% |  | 0.46% - 2.74%
Volatility |  | 100% - 132% |  | 104%
Expected life (years) |  | 3.0 - 6.25 |  | 5.5 - 6.5
Dividend yield |  | 0 % |  | 0 %
Summary of Stock Option Activity under Plans | A summary of stock option activity under the Plans is presented below (in thousands, except exercise price):
|  | Options outstanding |
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Number of |  |  | Exercise |
|  | Shares |  |  | Prices |
Balance as of January 1, 2020 |  |  | 467 |  |  | $ | 8.20 |
Options granted |  |  | 845 |  |  | $ | 2.65 |
Options cancelled and returned to the Plans |  |  | (254 | ) |  | $ | 6.85 |
Options exercised |  |  | (5 | ) |  | $ | 1.77 |
Balance as of December 31, 2020 |  |  | 1,053 |  |  | $ | 2.54 |
Options granted |  |  | 409 |  |  | $ | 3.00 |
Options exercised |  |  | (42 | ) |  | $ | 2.72 |
Options cancelled and returned to the Plans |  |  | (20 | ) |  | $ | 1.72 |
Effect of business combination |  |  | 158 |  |  | $ | 10.35 |
Balance as of December 31, 2021 |  |  | 1,558 |  |  | $ | 3.49 |
Summary of RSU Activity under Plans | A summary of RSU activity under the Plans is presented below (in thousands, except fair value):
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |
Non-vested shares as of December 31, 2020 |  |  | — |  |  | $ | 0.00 |
Granted |  |  | 30 |  |  | $ | 5.07 |
Vested |  |  | (10 | ) |  | $ | 4.21 |
Effect of business combination |  |  | 68 |  |  | $ | 4.21 |
Non-vested shares as of December 31, 2021 |  |  | 88 |  |  | $ | 4.50 |
Summary of Significant Ranges of Outstanding and Exercisable Options | The following table summarizes significant ranges of outstanding and exercisable options at December 31, 2021 (in thousands, except contractual life and exercise price):
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  | Weighted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Remaining |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Contractual |  |  | Average |  |  |  |  |  |  | Average |  |  | Aggregate |
|  | Number |  |  | Life |  |  | Exercise |  |  | Number |  |  | Exercise |  |  | Intrinsic |
Range of Exercise Price |  | Outstanding |  |  | (in Years) |  |  | Price |  |  | Exercisable |  |  | Price |  |  | value |
$1.57 - $14.99 |  |  | 1,542 |  |  |  | 6.64 |  |  | $ | 2.67 |  |  |  | 552 |  |  | $ | 2.55 |  |  | $ | 908 |
$15.00 - $25.59 |  |  | 8 |  |  |  | 1.78 |  |  | $ | 15.00 |  |  |  | 8 |  |  | $ | 15.00 |  |  | $ | — |
$25.60 - $143.99 |  |  | 2 |  |  |  | 3.62 |  |  | $ | 40.15 |  |  |  | 2 |  |  | $ | 41.81 |  |  | $ | — |
$144.00 - $409.99 |  |  | 5 |  |  |  | 4.69 |  |  | $ | 144.00 |  |  |  | 5 |  |  | $ | 144.00 |  |  | $ | — |
$410.00 - $924.00 |  |  | 1 |  |  |  | 3.05 |  |  | $ | 410.00 |  |  |  | 1 |  |  | $ | 430.64 |  |  | $ | — |
$1.57 - $924.00 |  |  | 1,558 |  |  |  |  |  |  | $ | 3.49 |  |  |  | 568 |  |  | $ | 4.71 |  |  | $ | 908 |

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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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