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CONSOLIDATED CONDENSED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Accounts receivable, reserves $ 785,000 $ 797,000
Stockholders’ equity (deficit):    
Preferred stock, par value (in dollars per share) $ 0.001  
Preferred stock, shares authorized (in shares) 5,000,000  
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) 20,492,601 13,003,893
Common stock, shares outstanding (in shares) 20,492,601 13,003,893
Series A Preferred Stock [Member]    
Stockholders’ equity (deficit):    
Convertible preferred stock 3.60% 3.60%
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