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Summary of Significant Accounting Policies - Amortization Expense Associated with Commissions Asset and Intake Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Intake Costs asset        
Capitalized Contract Cost [Line Items]        
Amortization expense $ 2,250 $ 2,294 $ 7,764 $ 7,915
Capitalized commissions asset        
Capitalized Contract Cost [Line Items]        
Amortization expense $ 4,224 $ 3,053 $ 14,105 $ 10,433