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CONSOLIDATED CONDENSED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Accounts receivable, reserves $ 185 $ 167
Stockholders’ equity:    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 23,500 23,500
Preferred stock, shares outstanding (in shares) 1,186 2,431
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 6,176,054 5,782,573
Common stock, shares outstanding (in shares) 6,176,054 5,782,573