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Stockholder's Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment | $ 1,042 | $ 912 | $ 3,029 | $ 2,459
Stock options exercised, delivered to company | 143 |  |  |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment | 1,031 | 899 | 2,988 | $ 2,430
Unrecognized compensation expense | $ 4,045 |  | $ 4,045 |
Weighted-average period of recognition |  |  | 2 years 7 months 13 days |
Stock options exercised (in shares) | 18,000 |  | 263,000 |
Stock options exercised, delivered to company |  |  | $ 2,615 |
Stock options granted (in shares) | 0 |  | 496,000 | 654,000
Stock options expired (in shares) | 48,000 |  | 126,000 |
Stock options outstanding (in shares) | 2,142,000 |  | 2,142,000 |
Stock options outstanding, weighted average exercise price (in USD per share) | $ 9.92 |  | $ 9.92 |
Stock options exercisable (in shares) | 846,000 |  | 846,000 |
Exercisable stock options, weighted average exercise price (in USD per share) | $ 9.33 |  | $ 9.33 |
Restricted stock surrendered (in shares) | 0 |  | 0 |
Employee Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment | $ 11 | $ 13 |  |
Employee Stock | ESPP Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment |  |  | $ 41 | $ 29
Percentage of Company's common stock share price | 85.00% |  | 85.00% |
Stock options issued ESPP (in shares) | 26,000 | 0 | 26,000 | 20,000
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense | $ 4,469 |  | $ 4,469 |
Weighted-average period of recognition |  |  | 2 years 4 months 24 days |
Restricted stock (in shares) | 60,000 |  | 217,000 |
Restricted stock, weighted average price (in USD per share) | $ 11.00 |  | $ 12.23 |
Restricted stock award, forfeitures, less than (in shares) | 17,000 |  | 37,000 |
Restricted stock vested (in shares) | 68,000 |  | 228,000 |
Restricted stock surrendered (in shares) | 0 |  | 0 |
Restricted stock outstanding (in shares) | 509,000 |  | 509,000 |
Unvested outstanding options (in shares) | 0 |  | 0 |
Performance-Based or Market-Based Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested outstanding options (in shares) | 0 |  | 0 |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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