Segments - Summary of Revenue by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 44,320	$ 40,627	$ 38,779	$ 36,843	$ 34,842	$ 32,254	$ 31,684	$ 30,471	$ 160,569	$ 129,251	$ 106,615
North America
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									120,306	101,192	86,565
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									33,800	22,296	16,077
APAC
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									$ 6,463	$ 5,763	$ 3,973