Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net (Details)

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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment $ 3,632 $ 3,320
Less: accumulated depreciation and amortization (3,079) (3,038)
Property and equipment, net 553 282
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 2,894 2,893
Machinery and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life 3 years  
Machinery and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life 10 years  
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 49 49
Office furniture and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Useful Life 3 years  
Office furniture and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Useful Life 10 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Useful Life 6 years  
Property and equipment $ 228 228
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 461 $ 150