Information about Geographic Areas - Revenue and Long-Lived Assets by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Total revenue:
Total revenue	$ 26,265	$ 22,731
Long-lived assets:
Total long-lived assets	6,275		6,410
North America [Member]
Total revenue:
Total revenue	23,745	20,591
Long-lived assets:
Total long-lived assets	1,483		1,597
Asia [Member]
Total revenue:
Total revenue	1,385	1,084
Long-lived assets:
Total long-lived assets	361		360
Europe [Member]
Total revenue:
Total revenue	1,135	1,056
Long-lived assets:
Total long-lived assets	$ 4,431		$ 4,453