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Summary of Significant Accounting Policies and Other Items - Accounts Receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable and Allowance for Credit Losses      
Unbilled revenue $ 24,100 $ 8,700  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at Beginning of Period 598 837 $ 576
Expense 310 342 355
Write off (167) (581) (94)
Balance at End of Period $ 741 $ 598 $ 837