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Summary of Significant Accounting Policies - Allowance for Credit Loss (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses, beginning of period $ 2,266 $ 2,260
Charges (recoveries) to costs and expenses, net 6 (80)
Account write-offs and other 39  
Account write-offs and other   (192)
Allowance for credit losses, end of period $ 2,311 $ 1,988