Information about Geographic Areas - Classification of Revenue by Geography (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 11,593	$ 8,751
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	7,523	5,989
Europe, Middle East & Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	2,943	1,763
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,127	$ 999