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Stockholders' Equity - Stock Options and Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Stock-based compensation, general disclosures. |  |  |  |  |
Stock-based compensation expense | $ 2,892 | $ 2,658 | $ 5,121 | $ 5,115 |
Common stock options |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Stock-based compensation expense | 600 | $ 1,100 | 1,400 | $ 2,300 |
Total unrecognized pre-tax compensation expense related to nonvested stock option awards | $ 1,700 |  | $ 1,700 |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  |  | 1 year 8 months 12 days |  |
Options Outstanding |  |  |  |  |
Outstanding at beginning of period |  |  | 915,224 |  |
Exercised |  |  | (90,169) |  |
Forfeited |  |  | (47,509) |  |
Cancelled/Expired |  |  | (54,775) |  |
Outstanding at end of period | 722,771 |  | 722,771 |  | 915,224
Weighted Average Exercise Price Per Share |  |  |  |  |
Outstanding at beginning of period |  |  | $ 39.33 |  |
Exercised |  |  | 1.69 |  |
Forfeited |  |  | 47.38 |  |
Cancelled/Expired |  |  | 46.10 |  |
Outstanding at end of period | $ 42.99 |  | $ 42.99 |  | $ 39.33
Other information |  |  |  |  |
Options exercisable number of shares exercisable | 482,154 | 509,575 | 482,154 | 509,575 |
Options exercisable, weighted-average exercise price | $ 41.52 | $ 31.20 | $ 41.52 | $ 31.20 |
Weighted average remaining contractual life (in years) |  |  | 4 years 9 months 18 days |  | 5 years
Options exercisable, weighted-average remaining contractual life |  |  | 4 years 6 months |  |
Aggregate Intrinsic Value, Options outstanding | $ 45 |  | $ 45 |  | $ 2,068
Aggregate Intrinsic Value, Exercised |  |  | 910 |  |
Aggregate Intrinsic Value, Options exercisable | 45 |  | $ 45 |  |
Common stock options | Minimum |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |
Term (in years) |  |  | 7 years |  |
Common stock options | Maximum |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Vesting period (in years) |  |  | 4 years |  |
Term (in years) |  |  | 10 years |  |
2016 Plan | Time-Based Restricted Stock Units |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Stock-based compensation expense | 1,600 | $ 1,200 | $ 3,000 | $ 2,500 |
Total unrecognized pre-tax compensation expense related to awards | $ 10,500 |  | $ 10,500 |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  |  | 2 months 3 days |  |
Units Outstanding |  |  |  |  |
Restricted stock unit awards outstanding at the beginning of the period (in shares) |  |  | 259,147 |  |
Granted (in shares) |  |  | 407,844 |  |
Vested (in shares) |  |  | 70,594 |  |
Cancelled (in shares) |  |  | (37,217) |  |
Restricted stock unit awards outstanding at the end of the period (in shares) | 559,180 |  | 559,180 |  | 259,147
Weighted Average Grant Date Fair Value Per Unit |  |  |  |  |
Restricted stock unit awards outstanding at the beginning of the period (in dollars per share) |  |  | $ 42.32 |  |
Granted (in dollars per share) |  |  | 17.05 |  |
Vested (in dollars per share) |  |  | 51.30 |  |
Cancelled (in dollars per share) |  |  | 32.94 |  |
Restricted stock unit awards outstanding at the end of the period (in dollars per share) | $ 23.38 |  | $ 23.38 |  | $ 42.32
Aggregate Intrinsic Value |  |  |  |  |
Restricted stock unit awards, Average Intrinsic Value | $ 4,082 |  | $ 4,082 |  | $ 4,932
2016 Plan | Time-Based Restricted Stock Units | Minimum |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Vesting period (in years) |  |  | 1 year |  |
2016 Plan | Time-Based Restricted Stock Units | Maximum |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |
2016 Plan | Performance-based stock-settled restricted stock units |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Stock-based compensation expense | 300 | $ 200 | $ 100 | $ 100 |
Total unrecognized pre-tax compensation expense related to awards | $ 2,500 |  | $ 2,500 |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  |  | 2 years 6 months |  |
Units Outstanding |  |  |  |  |
Restricted stock unit awards outstanding at the beginning of the period (in shares) |  |  | 54,317 |  |
Granted (in shares) |  |  | 131,710 |  |
Vested (in shares) |  |  | 1,853 |  |
Cancelled (in shares) |  |  | (20,147) |  |
Restricted stock unit awards outstanding at the end of the period (in shares) | 164,027 |  | 164,027 |  | 54,317
Weighted Average Grant Date Fair Value Per Unit |  |  |  |  |
Restricted stock unit awards outstanding at the beginning of the period (in dollars per share) |  |  | $ 50.22 |  |
Granted (in dollars per share) |  |  | 18.54 |  |
Vested (in dollars per share) |  |  | 19.03 |  |
Cancelled (in dollars per share) |  |  | 23.18 |  |
Restricted stock unit awards outstanding at the end of the period (in dollars per share) | $ 25.11 |  | $ 25.11 |  | $ 50.22
Aggregate Intrinsic Value |  |  |  |  |
Restricted stock unit awards, Average Intrinsic Value | $ 1,197 |  | $ 1,197 |  | $ 1,034
2016 Plan | Performance-based stock-settled restricted stock units | Minimum |  |  |  |  |
Units Outstanding |  |  |  |  |
Percentage to earn or vest the performance-based stock-settled restricted stock units |  |  | 50.00% |  |
2016 Plan | Performance-based stock-settled restricted stock units | Maximum |  |  |  |  |
Units Outstanding |  |  |  |  |
Percentage to earn or vest the performance-based stock-settled restricted stock units |  |  | 150.00% |  |
2016 Plan | Tranche one | Performance-based stock-settled restricted stock units |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Compensation arrangement |  |  | 33.33% |  |
2016 Plan | Tranche two | Performance-based stock-settled restricted stock units |  |  |  |  |
Stock-based compensation, general disclosures. |  |  |  |  |
Compensation arrangement |  |  | 66.67% |  |

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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(04) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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