Goodwill and Intangible Assets - Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Intangible Assets
Total amortization	$ 807	$ 1,133	$ 2,619	$ 3,115
Service costs
Intangible Assets
Total amortization	17	220	105	889
Sales and marketing
Intangible Assets
Total amortization	288	326	892	646
Product development
Intangible Assets
Total amortization	104	184	428	769
General and administrative
Intangible Assets
Total amortization	$ 398	$ 403	$ 1,194	$ 811