Information about Geographic Areas - Classification of Revenue by Geography (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 12,343	$ 8,389	$ 31,975	$ 21,283
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	8,049	5,333	21,425	15,028
Europe, Middle East & Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	2,385	1,592	6,278	3,702
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,909	$ 1,464	$ 4,272	$ 2,553