Information about Geographic Areas - Revenue and Long-Lived Assets by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Total revenue:
Total revenue	$ 23,055	$ 21,837	$ 45,786	$ 42,707
Long-lived assets:
Total long-lived assets	6,487		6,487		5,625
North America [Member]
Total revenue:
Total revenue	19,910	19,757	40,501	38,839
Long-lived assets:
Total long-lived assets	1,614		1,614		678
Asia [Member]
Total revenue:
Total revenue	1,666	846	2,750	1,750
Long-lived assets:
Total long-lived assets	373		373		403
Europe [Member]
Total revenue:
Total revenue	1,479	1,234	2,535	2,118
Long-lived assets:
Total long-lived assets	$ 4,499		$ 4,499		$ 4,544