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Stock-based Compensation - Recognized and Unamortized Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation |  |  |  |  |
Total stock-based compensation expense | $ 1,837 | $ 2,205 | $ 5,722 | $ 4,413 |
Total unamortized stock-based compensation expense | 13,634 |  | $ 13,634 |  | $ 10,884
Weighted average period over which expense is to be recognized |  |  | 3 years |  | 3 years
RSUs |  |  |  |  |
Share-based Compensation |  |  |  |  |
Total stock-based compensation expense | 1,316 | 2,029 | $ 4,362 | 3,952 |
Total unamortized stock-based compensation expense | 11,650 |  | 11,650 |  | $ 10,411
PSUs |  |  |  |  |
Share-based Compensation |  |  |  |  |
Total stock-based compensation expense | 290 | 41 | 619 | 41 |
Total unamortized stock-based compensation expense | 1,554 |  | 1,554 |  | 179
DSUs |  |  |  |  |
Share-based Compensation |  |  |  |  |
Total stock-based compensation expense | 231 | $ 135 | 741 | $ 420 |
Total unamortized stock-based compensation expense | $ 430 |  | $ 430 |  | $ 294

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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