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Summary of Significant Accounting Policies - Composition of the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period $ 14,948 $ 8,541 $ 9,398 $ 5,839
Charges to bad debt expense 1,566 773 2,910 4,012
Direct write-offs charged against the allowance (110) (1,631) (971) (2,168)
Balance at end of period $ 16,404 $ 7,683 16,404 $ 7,683
Adjustment due to Adoption of New ASU        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Balance at beginning of period     $ 5,067