Segment Information - Company's Revenue by Geographic Region, Based on Customer's Location (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	$ 164,010	$ 137,759	$ 104,235
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	94,266	83,736	61,588
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	43,111	33,183	24,958
APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net revenue	$ 26,633	$ 20,840	$ 17,689