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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Net sales $ 8,289 $ 8,030
Cost of sales 9,278 8,586
Gross margin (989) (556)
Operating expenses:    
Research and development 43 104
Selling and marketing 683 611
General and administrative 1,122 1,094
Total operating expenses 1,848 1,809
Loss from operations (2,837) (2,365)
Net equity income from foreign joint ventures’ operations:    
Equity income from foreign joint ventures’ operations 171 52
Foreign joint ventures’ operations related expenses (61) (64)
Net equity income from foreign joint ventures’ operations 110 (12)
Loss from operations and net equity income from foreign joint ventures’ operations (2,727) (2,377)
Other income (expense):    
Interest expense and other, net (178) (100)
Loss before income taxes (2,905) (2,477)
Provision for income taxes 59 18
Net loss (2,964) (2,495)
Dividends on redeemable convertible preferred stock (90) (89)
Net loss attributable to common stockholders $ (3,054) $ (2,584)
Loss per common share:    
Basic $ (0.35) $ (0.31)
Diluted $ (0.35) $ (0.31)
Weighted - average number of common shares outstanding:    
Basic 8,723,530 8,337,119
Diluted 8,723,530 8,337,119