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Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-Based Compensation |  |  |  |
Stock options | $ 74 | $ 140 | $ 436 | $ 535
Restricted stock units | 87 | 165 | 71 | 640
Deferred stock units | (131) |  | 204 |
Total | $ 30 | $ 305 | $ 711 | $ 1,175

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- Definition Amount of noncash expense for deferred stock unit awards under share-based payment arrangements. + References No definition available. + Details
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- Definition Share Based Compensation Restricted Stock Units + References No definition available. + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Amount of noncash expense for option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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