Segment Information and Information about Geographic Areas (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) item	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Information and Information about Geographic Areas
Number of business segment | item									1
Revenue and long-lived assets by geographic area
Revenue	$ 58,267	$ 54,922	$ 50,680	$ 46,000	$ 42,345	$ 39,287	$ 36,030	$ 32,292	$ 209,869	$ 149,954	$ 95,918
Long-lived assets	21,323				16,832				21,323	16,832
United States
Revenue and long-lived assets by geographic area
Revenue									177,730	125,737	82,019
Long-lived assets	19,508				16,265				19,508	16,265
EMEA
Revenue and long-lived assets by geographic area
Revenue									14,438	12,772	6,989
Long-lived assets	327				209				327	209
Other
Revenue and long-lived assets by geographic area
Revenue									17,701	11,445	$ 6,910
Long-lived assets	$ 1,488				$ 358				$ 1,488	$ 358