Annual report pursuant to Section 13 and 15(d)

Improvements and Equipment, net (Details)

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Improvements and Equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Machinery and equipment $ 4,911 $ 5,041
Office furniture and equipment 344 337
Leasehold improvements [1] 594 595
Property, Plant and Equipment, Gross, Total 5,849 5,973
Less: Accumulated depreciation and amortization (4,286) (3,881)
Improvements and equipment, net $ 1,563 $ 2,092
Machinery and Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Machinery and Equipment [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 10 years  
Office Equipment [Member] | Minimum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Leasehold Improvements [Member] | Maximum [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 10 years  
[1] Leasehold improvements are amortized over the shorter of the remaining lease term or estimated useful life.