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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Net sales $ 8,298 $ 15,311
Cost of sales 8,207 13,028
Gross profit 91 2,283
Operating expenses:    
Research and development 523 138
Selling and marketing 876 603
General and administrative 1,346 1,267
Total operating expenses 2,745 2,008
Income (loss) from operations (2,654) 275
Net equity income (loss) from foreign joint ventures’ operations:    
Equity income (loss) from foreign joint ventures’ operations (195) 116
Foreign joint ventures’ operations related expenses (51) (98)
Net equity income (loss) from foreign joint ventures’ operations (246) 18
Income (loss) from operations and net equity income from foreign joint ventures’ operations (2,900) 293
Other income (expense):    
Interest expense and other, net (39) (19)
Income (loss) before income taxes (2,939) 274
Provision for (benefit from) income taxes (56)  
Net income (loss) before dividends on redeemable convertible preferred stock (2,883) 274
Dividends on redeemable convertible preferred stock (88) (87)
Net income (loss) attributable to common stockholders $ (2,971) $ 187
Earnings (loss) per common share:    
Basic $ (0.36) $ 0.02
Diluted $ (0.36) $ 0.02
Weighted - average number of common shares outstanding:    
Basic 8,263,223 8,206,684
Diluted 8,263,223 8,441,782