Information about Geographic Areas - Classification of Revenue by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 15,693	$ 12,343	$ 40,352	$ 31,975
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	10,929	8,049	26,584	21,425
Europe & Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	3,400	2,385	9,355	6,278
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,364	$ 1,909	$ 4,413	$ 4,272