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Other Assets - Loan to a Distribution Partner and Prepaid Expenses (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) renewal_option	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jul. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	May 31, 2018 USD ($)	Apr. 30, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue from distribution partners		$ 127,880	$ 111,848	$ 361,875	$ 309,092
Notes Receivable | Distribution Partner Two
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
Notes Receivable | Distribution Partner Two | London Interbank Offered Rate (LIBOR)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread on variable rate	4.00%
Notes Receivable | Distribution Partner Three
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivable, noncurrent									$ 3,000
Debt instrument, interest rate		8.50%		8.50%
Notes Receivable | Distribution Partners Two and Three
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue from distribution partners		$ 400	$ 200	$ 1,300	$ 900
Term Loan | Distribution Partner Two
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, interest rate		6.00%		6.00%
Receivable, face amount								$ 4,000
Annual principal repayment on loan						$ 1,000
Term Loan | Distribution Partner Two | London Interbank Offered Rate (LIBOR)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread on variable rate		7.00%		7.00%
Other Assets | Notes Receivable | Distribution Partner Two
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivable, noncurrent		$ 2,000		$ 2,000			$ 3,000
Other Assets | Notes Receivable | Distribution Partner Three
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivable, noncurrent		3,000		3,000
Other Current Assets | Notes Receivable | Distribution Partner Two
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivable, current		$ 1,000		$ 1,000			$ 1,000

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