Information about Geographic Areas - Revenue and Long-Lived Assets by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Total revenue:
Total revenue	$ 25,829	$ 23,572	$ 21,837	$ 20,870	$ 25,856	$ 25,485	$ 24,505	$ 25,548	$ 92,108	$ 101,394
Long-lived assets:
Total long-lived assets	5,625				8,813				5,625	8,813
Operating Segments [Member] | North America [Member]
Total revenue:
Total revenue									80,412	81,581
Long-lived assets:
Total long-lived assets	678				3,663				678	3,663
Operating Segments [Member] | Asia [Member]
Total revenue:
Total revenue									7,314	14,875
Long-lived assets:
Total long-lived assets	403				447				403	447
Operating Segments [Member] | Europe [Member]
Total revenue:
Total revenue									4,382	4,938
Long-lived assets:
Total long-lived assets	$ 4,544				$ 4,703				$ 4,544	$ 4,703