Information about Geographic Areas - Revenue and Long-Lived Assets by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Revenue:
Total revenue	$ 22,731	$ 20,870
Long-lived assets:
Total long-lived assets	6,675		5,625
North America [Member]
Revenue:
Total revenue	20,591	19,082
Long-lived assets:
Total long-lived assets	1,776		678
Asia [Member]
Revenue:
Total revenue	1,084	904
Long-lived assets:
Total long-lived assets	373		403
Europe [Member]
Revenue:
Total revenue	1,056	884
Long-lived assets:
Total long-lived assets	$ 4,526		$ 4,544