Information about Geographic Areas - Classification of Revenue by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 14,697	$ 11,593
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	10,083	7,523
Europe & Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	2,853	2,943
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,761	$ 1,127