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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Net sales $ 8,030 $ 8,298
Cost of sales 8,586 8,207
Gross margin (556) 91
Operating expenses:    
Research and development 104 523
Selling and marketing 611 876
General and administrative 1,094 1,346
Total operating expenses 1,809 2,745
Income (loss) from operations (2,365) (2,654)
Net equity income (loss) from foreign joint ventures’ operations:    
Equity income (loss) from foreign joint ventures’ operations 52 (195)
Foreign joint ventures’ operations related expenses (64) (51)
Net equity loss from foreign joint ventures’ operations (12) (246)
Loss from operations and net equity income from foreign joint ventures’ operations (2,377) (2,900)
Other income (expense):    
Interest expense and other, net (100) (39)
Loss before income taxes (2,477) (2,939)
Provision for (benefit from) income taxes 18 (56)
Net loss before dividends on redeemable convertible preferred stock (2,495) (2,883)
Dividends on redeemable convertible preferred stock (89) (88)
Net loss attributable to common stockholders $ (2,584) $ (2,971)
Earnings (loss) per common share:    
Basic $ (0.31) $ (0.36)
Diluted $ (0.31) $ (0.36)
Weighted - average number of common shares outstanding:    
Basic 8,337,119 8,263,223
Diluted 8,337,119 8,263,223