Geographic Information - Schedule of Revenue by Geographic Areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 430,492	$ 311,999	$ 208,768
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	229,663	168,479	116,220
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	123,036	87,360	59,047
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 77,793	$ 56,160	$ 33,501