Information about Geographic Areas - Classification of Revenue by Geography (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 15,618	$ 12,343	$ 10,881	$ 8,751	$ 10,120	$ 8,389	$ 7,218	$ 5,676	$ 47,593	$ 31,403	$ 22,973
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									32,244	21,855	15,906
Europe & Middle East [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									9,174	5,775	4,167
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue									$ 6,175	$ 3,773	$ 2,900