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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 2,824 $ 2,623
Less: accumulated depreciation and amortization (2,428) (2,248)
Property and equipment, net 396 375
Machinery and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,394 1,354
Computer Equipment and Software [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 445 310
Office Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 208 202
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 777 $ 757