Information about Operating Segments and Geographic Areas - Revenue and Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Total revenue:
Total revenue	$ 26,797	$ 22,467	$ 22,738	$ 25,439	$ 25,028	$ 26,435	$ 28,873	$ 26,265	$ 97,441	$ 106,601
Long-lived assets:
Total long-lived assets	5,351				5,945				5,351	5,945
North America [Member]
Total revenue:
Total revenue									92,299	97,858
Long-lived assets:
Total long-lived assets	1,025				1,353				1,025	1,353
Asia [Member]
Total revenue:
Total revenue									2,024	3,405
Long-lived assets:
Total long-lived assets	90				247				90	247
Europe [Member]
Total revenue:
Total revenue									3,118	5,338
Long-lived assets:
Total long-lived assets	$ 4,236				$ 4,345				$ 4,236	$ 4,345