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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Net sales $ 13,268 $ 8,673 $ 34,258 $ 28,415
Cost of sales 12,192 9,124 32,922 27,549
Gross margin 1,076 (451) 1,336 866
Operating expenses:        
Research and development 55 145 237 864
Selling and marketing 646 466 1,952 1,759
General and administrative 1,125 1,587 3,116 3,914
Total operating expenses 1,826 2,198 5,305 6,537
Loss from operations (750) (2,649) (3,969) (5,671)
Net equity income from foreign joint ventures’ operations:        
Equity income from foreign joint ventures’ operations 98 215 284 367
Foreign joint ventures’ operations related expenses (67) (53) (195) (202)
Net equity income from foreign joint ventures’ operations 31 162 89 165
Loss from operations and net equity income from foreign joint ventures’ operations (719) (2,487) (3,880) (5,506)
Other income (expense):        
Interest expense and other, net (332) (78) (797) 200
Income (loss) before income taxes (1,051) (2,565) (4,677) (5,306)
Provision for (benefit from) income taxes (11) 59 (83) 50
Net income (loss) before dividends on redeemable convertible preferred stock (1,040) (2,624) (4,594) (5,356)
Dividends on redeemable convertible preferred stock (89) (89) (267) (265)
Net income (loss) attributable to common stockholders $ (1,129) $ (2,713) $ (4,861) $ (5,621)
Earnings (loss) per common share:        
Basic $ (0.13) $ (0.33) $ (0.57) $ (0.68)
Diluted $ (0.13) $ (0.33) $ (0.57) $ (0.68)
Weighted - average number of common shares outstanding:        
Basic 8,598,461 8,327,009 8,478,848 8,294,268
Diluted 8,598,461 8,327,009 8,478,848 8,294,268