Property and Equipment - Schedule of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Computer equipment and purchased software	$ 3,411	$ 3,595
Machinery and equipment	690	704
Furniture and fixtures	819	607
Leasehold improvements	1,293	938
Total	6,213	5,844
Less accumulated depreciation	(4,849)	(4,900)
Property and equipment, net	$ 1,364	$ 944