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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

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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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

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