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Summary of Significant Accounting Policies - Cash and Cash Equivalents and Accounts Receivable and Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Allowance for doubtful accounts $ 1,467 $ 1,203
Unbilled accounts receivable $ 32,665 $ 27,692