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Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2022
Share-Based Payment Arrangement [Abstract] |
Stock Plan Activities | Related activity under the Incentive Plan is as follows:
| Awards Available |  | Options Outstanding |  | Weighted Average Exercise Price
Balance December 31, 2021 | 3,651 |  |  | 28,685 |  |  | $ | 7.90 |
Plan amendment | 8,000 |  |  | — |  |  | — |
Restricted stock unit awards granted | (681) |  |  | — |  |  | — |
Restricted stock unit awards cancelled | 218 |  |  | — |  |  | — |
Stock option awards granted | (813) |  |  | 813 |  |  | 11.10 |
Stock option awards exercised | — |  |  | (1,334) |  |  | 5.65 |
Stock option awards cancelled | 787 |  |  | (787) |  |  | 10.02 |
Balance September 30, 2022 | 11,162 |  |  | 27,377 |  |  | $ | 8.04 |
Related activity under the Inducement Plan is as follows:
| Awards Available |  | Options Outstanding |  | Weighted Average Exercise Price
Balance December 31, 2021 | 900 |  |  | 4,408 |  |  | $ | 6.20 |
Plan amendment | 1,926 |  |  | — |  |  | — |
Restricted stock unit awards granted | (424) |  |  | — |  |  | — |
Restricted stock unit awards cancelled | 2 |  |  | — |  |  | — |
Stock option awards granted | (1,381) |  |  | 1,381 |  |  | 13.84 |
Stock option awards exercised | — |  |  | (196) |  |  | 3.77 |
Stock option awards cancelled | 323 |  |  | (323) |  |  | 7.02 |
Balance September 30, 2022 | 1,346 |  |  | 5,270 |  |  | $ | 8.28 |
Weighted Average Assumptions for Stock Option Awards Granted to Employees and Directors Under the Plans | Weighted Average Assumptions for Stock Option Awards Granted to Employees and Directors under the Plans
| 2022 |  | 2021
Expected Life in Years | 5.5 |  | 5.5
Expected Volatility | 84.1 | % |  | 84.2 | %
Expected Dividend Yield | 0.0 | % |  | 0.0 | %
Risk-Free Interest Rate | 2.9 | % |  | 0.8 | %

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, 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 (e) -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 (c)(2) -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 (d) -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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