Intangible Assets - Amortization by classification (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets
Amortization of intangible assets	$ 3,353	$ 4,071
Service costs
Intangible Assets
Amortization of intangible assets	118	1,035
Service costs | Maximum
Intangible Assets
Accelerated amortization of intangible assets	100	100
Sales and marketing
Intangible Assets
Amortization of intangible assets	1,177	948
Product development
Intangible Assets
Amortization of intangible assets	474	931
General and administrative
Intangible Assets
Amortization of intangible assets	$ 1,584	$ 1,157