Other Assets - Loan to a Service Provider Partner (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jul. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total revenue	$ 158,851	$ 127,880	$ 452,427	$ 361,875
Service Provider | Loan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, maximum available					$ 2,500
Debt instrument, interest rate					9.00%
Loan receivable, noncurrent	600		600
Total revenue	$ 100	$ 100	$ 100	$ 100