Information about Geographic Areas - Revenue and Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Total revenue:
Total revenue	$ 28,873	$ 23,055	$ 55,138	$ 45,786
Long-lived assets:
Total long-lived assets	6,256		6,256		$ 6,410
North America [Member]
Total revenue:
Total revenue	27,015	19,910	50,761	40,501
Long-lived assets:
Total long-lived assets	1,361		1,361		1,597
Asia [Member]
Total revenue:
Total revenue	603	1,666	1,988	2,750
Long-lived assets:
Total long-lived assets	482		482		360
Europe [Member]
Total revenue:
Total revenue	1,255	$ 1,479	2,389	$ 2,535
Long-lived assets:
Total long-lived assets	$ 4,413		$ 4,413		$ 4,453