Information about Geographic Areas - Classification of Revenue by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 18,063	$ 14,697
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	12,211	10,083
Europe & Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	4,415	2,853
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,437	$ 1,761