Information about Geographic Areas - Classification of Revenue by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 22,315	$ 15,693	$ 13,066	$ 11,593	$ 15,618	$ 12,343	$ 10,881	$ 8,751	$ 62,667	$ 47,593	$ 31,403
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									41,265	32,244	21,855
Europe & Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									14,807	9,174	5,775
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									$ 6,595	$ 6,175	$ 3,773