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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accounts receivable-trade, allowance $ 211 $ 204
Inventories, allowance 134 60
Redeemable convertible preferred stock, Series A, discount $ 604 $ 617
Redeemable convertible preferred stock, par value $ 0.001 $ 0.001
Redeemable convertible preferred stock, shares authorized 1,000,000 1,000,000
Redeemable convertible preferred stock, shares issued 1,000,000 1,000,000
Redeemable convertible preferred stock, shares outstanding 1,000,000 1,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 50,000,000 50,000,000
Common stock, shares issued 8,650,410 8,499,508
Common stock, shares outstanding 8,486,870 8,335,968
Treasury stock, shares 163,540 163,540
Equity Method Investments    
Retained earnings; accumulated statutory reserves in equity method investments $ 2,887 $ 2,887