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Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 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 | (663) |  |  | — |  |  | — |
Restricted stock unit awards cancelled | 52 |  |  | — |  |  | — |
Stock option awards granted | (776) |  |  | 776 |  |  | 11.10 |
Stock option awards exercised | — |  |  | (1,086) |  |  | 5.72 |
Stock option awards cancelled | 472 |  |  | (472) |  |  | 10.67 |
Balance June 30, 2022 | 10,736 |  |  | 27,903 |  |  | $ | 8.03 |
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 |
Restricted stock unit awards granted | (203) |  |  | — |  |  | — |
Restricted stock unit awards cancelled | 2 |  |  | — |  |  | — |
Stock option awards granted | (697) |  |  | 697 |  |  | 14.75 |
Stock option awards exercised | — |  |  | (55) |  |  | 3.12 |
Stock option awards cancelled | 130 |  |  | (130) |  |  | 8.18 |
Balance June 30, 2022 | 132 |  |  | 4,920 |  |  | $ | 7.43 |
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 | 2.5 | % |  | 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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