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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]    
Net sales $ 47,130 $ 37,812
Cost of sales 44,702 36,796
Gross profit 2,428 1,016
Operating expenses:    
Research and development 280 962
Selling and marketing 2,465 2,181
General and administrative 4,194 5,242
Total operating expenses 6,939 8,385
Loss from operations (4,511) (7,369)
Net equity income from foreign joint ventures’ operations:    
Equity income from foreign joint ventures’ operations 656 529
Foreign joint ventures’ operations related expenses (250) (245)
Net equity income from foreign joint ventures’ operations 406 284
Loss from operations and net equity income from foreign joint ventures’ operations (4,105) (7,085)
Other income (expense):    
Interest expense and other, net (1,078) 69
Loss before income taxes (5,183) (7,016)
Provision for (benefit from) income taxes (2,955) 44
Net loss before dividends on redeemable convertible preferred stock (2,228) (7,060)
Dividends on redeemable convertible preferred stock (356) (353)
Net loss attributable to common stockholders [1] $ (2,584) $ (7,413)
Earnings (loss) per common share:    
Basic $ (0.30) $ (0.89)
Diluted $ (0.30) $ (0.89)
Weighted - average number of common shares outstanding:    
Basic 8,525,645 8,305,764
Diluted 8,525,645 8,305,764
[1] Net of preferred dividends of $356 and $353 in 2017 and 2016, respectively.