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Summary of Significant Accounting Policies - Allowances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss    
Beginning balance $ 598 $ 95
Charges to the provision 1,450 1,010
Accounts written off, net of recoveries (1,257) (507)
Ending balance 791 598
Unbilled accounts receivable $ 1,300 $ 349