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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Current assets:    
Accounts receivable, reserves $ 167 $ 797
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) 13,500 13,500
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 75,000,000 75,000,000
Common stock, shares issued (in shares) 21,707,890 13,003,893
Common stock, shares outstanding (in shares) 21,707,890 13,003,893