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Other Assets - Loan to a Distribution Partner (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2016 USD ($) renewal_option	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 09, 2020 USD ($)	Jul. 31, 2019 USD ($)	Jul. 01, 2018	Jun. 30, 2018	May 31, 2018 USD ($)	Apr. 30, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue from distribution partners		$ 188,857	$ 141,637	$ 361,355	$ 293,576
Distribution Partner Two | Term Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, interest rate										6.00%
Receivable, face amount											$ 4,000
Annual principal repayment on loan							$ 2,000	$ 1,000
Loan receivable, noncurrent			3,000		3,000
Distribution Partner Two | Loan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable, maximum available	$ 4,000
Loan, interest rate	6.00%
Number of renewal options | renewal_option	2
Renewal term	1 year
Loan receivable, current											$ 4,000
Distribution Partner Two | London Interbank Offered Rate (LIBOR) | Term Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread on variable rate									7.00%
Distribution Partner Two | London Interbank Offered Rate (LIBOR) | Loan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread on variable rate	4.00%
Distribution Partner Three | Loan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivable, current							$ 1,000
Loan receivable, noncurrent			3,000		3,000							$ 3,000
Debt instrument, interest rate		9.00%		9.00%								8.50%
Distribution Partners Two and Three | Loan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue from distribution partners		$ 900	$ 900	$ 1,600	$ 1,300
Other Assets | Distribution Partner Three | Loan Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivable, noncurrent		$ 4,400		$ 4,400		$ 4,200

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