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Stock-based Compensation - Recognized and Unamortized Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation
Total stock-based compensation expense	$ 7,864	$ 7,135	$ 3,997
Total unamortized stock-based compensation expense	$ 11,960	$ 10,884
Weighted average period over which expense is to be recognized	2 years 10 months 24 days	3 years
Stock options
Share-based Compensation
Total stock-based compensation expense			146
RSU awards
Share-based Compensation
Total stock-based compensation expense	$ 5,809	$ 6,493	3,249
Total unamortized stock-based compensation expense	10,204	10,411
PSU awards
Share-based Compensation
Total stock-based compensation expense	979	77
Total unamortized stock-based compensation expense	1,547	179
DSU awards
Share-based Compensation
Total stock-based compensation expense	962	565	$ 602
Total unamortized stock-based compensation expense	209	$ 294
2021 ESPP
Share-based Compensation
Total stock-based compensation expense	$ 114

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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.

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