Component of Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Office and computer equipment	$ 1,076	$ 1,552
Software	884	856
Leasehold improvements	841	1,357
Manufacturing equipment	153	153
Property and equipment, Gross	2,954	3,918
Less: accumulated depreciation	(2,153)	(1,924)
Property and equipment, net	$ 801	$ 1,994