Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Balance Sheet Components - Schedule of Property, Plant and Equipment (Detail)

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Note 5 - Balance Sheet Components - Schedule of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 7,258 $ 7,362
Less: accumulated depreciation and amortization (4,405) (4,119)
Property and equipment, net 2,853 3,243
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 36 55
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,504 2,504
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,561 3,521
Vehicles [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 209 334
Manufacturing And Lab Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3 3
Displays [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 483 483
Website [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 462 $ 462