Intangible Assets - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Total amortization	$ 6,191	$ 3,861	$ 3,862
Acquired technology and domain name
Finite-Lived Intangible Assets [Line Items]
Total amortization	4,614	3,034	3,035
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total amortization	1,250	500	500
Trade names
Finite-Lived Intangible Assets [Line Items]
Total amortization	$ 327	$ 327	$ 327