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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Stockholders' equity:    
Series A 6% convertible preferred stock, par value $ 0.001 $ 0.001
Series A 6% convertible preferred stock, shares authorized 3,500,000 3,500,000
Series A 6% convertible preferred stock, shares issued 0
Series A 6% convertible preferred stock, shares outstanding 0
Series B convertible preferred stock, par value $ 0.001 $ 0.001
Series B convertible preferred stock, shares issued 3,588,139
Series B convertible preferred stock, shares outstanding 1,975,639
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 27,194,251 17,995,409
Common stock, shares outstanding 27,051,172 17,852,330