Property and Equipment - Schedule of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Computer equipment and purchased software	$ 3,634	$ 3,595
Machinery and equipment	706	704
Furniture and fixtures	807	607
Leasehold improvements	1,015	938
Total	6,162	5,844
Less accumulated depreciation	(5,008)	(4,900)
Property and equipment, net	$ 1,154	$ 944