Other Financial Information - Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Leasehold improvements	$ 43	$ 43
Machinery and equipment	1,591	1,385
Capital lease equipment	76	76
Computer software	130	142
Furniture and fixtures	35	37
Equipment in process	0	0
Total property and equipment	1,875	1,683
Less: accumulated depreciation and amortization	(585)	(325)
Property and equipment, net	1,290	1,358
Depreciation	$ 300	$ 200	$ 100