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Stock-based Compensation - Recognized and Unamortized Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Share-based Compensation |  |  |
Total stock-based compensation expense | $ 1,909 | $ 1,448 |
Total unamortized stock-based compensation expense | $ 19,207 |  | $ 11,960
Weighted average period over which expense is to be recognized | 2 years 10 months 24 days |  | 2 years 10 months 24 days
RSU awards |  |  |
Share-based Compensation |  |  |
Total stock-based compensation expense | $ 1,176 | 1,230 |
Total unamortized stock-based compensation expense | 12,838 |  | $ 10,204
PSU awards |  |  |
Share-based Compensation |  |  |
Total stock-based compensation expense | 412 | 60 |
Total unamortized stock-based compensation expense | 5,544 |  | 1,547
DSU awards |  |  |
Share-based Compensation |  |  |
Total stock-based compensation expense | 226 | $ 158 |
Total unamortized stock-based compensation expense | 825 |  | $ 209
2021 ESPP |  |  |
Share-based Compensation |  |  |
Total stock-based compensation expense | $ 95 |  |

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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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