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Other Financial Information - Property and Equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Leasehold improvements $ 20 $ 43
Machinery and equipment 1,569 1,591
Capital lease equipment 76 76
Computer software 130 130
Furniture and fixtures 29 35
Total property and equipment 1,824 1,875
Less: accumulated depreciation and amortization (818) (585)
Property and equipment, net 1,006 1,290
Depreciation $ 300 $ 300