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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Net revenues $ 1,395 $ 1,876
Cost of revenue 925 1,547
Gross profit 470 329
Operating expenses:    
General and administrative 1,083 467
Selling 135 92
Total operating expenses 1,218 559
Foreign joint venture:    
Equity income from joint venture 265 171
Joint venture operation's related expenses (54) (61)
Net equity income from foreign joint venture operations 211 110
Loss from operations (537) (120)
Other income (expense):    
Interest expense (21) (7)
Other income 63 82
Total other income 42 75
Loss from continuing operations before income tax expense (495) (45)
Income tax provision   60
Net loss from continuing operations (495) (105)
Loss from discontinued operations   (2,859)
Net loss (495) (2,964)
Dividend and accretion of discount on redeemable convertible preferred stock (91) (90)
Net loss attributable to common stockholders $ (586) $ (3,054)
Loss per common share - basic and diluted:    
Continuing operations $ (0.06) $ (0.02)
Discontinued operations   (0.33)
Consolidated operations $ (0.06) $ (0.35)
Weighted average number of common shares outstanding:    
Basic and diluted 9,282,013 8,723,530