Geographic Information and Major Customer and Product Data - Summary of Revenues within Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues based on customer's location:
Revenues	$ 101,348	$ 74,616	$ 53,410
United States [Member]
Revenues based on customer's location:
Revenues	56,910	42,165	31,062
EMEA [Member]
Revenues based on customer's location:
Revenues	35,809	25,986	18,690
Rest of the World [Member]
Revenues based on customer's location:
Revenues	$ 8,629	$ 6,465	$ 3,658