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Consolidated Statements of Stockholders' Equity - USD ($)
Series A Convertible Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit during Development Stage [Member] (Deprecated 2015-01-31)
Total
Balance (in shares) at Dec. 31, 2011     16,442,611      
Balance at Dec. 31, 2011     $ 16,443 $ 23,319,166 $ (22,632,002) $ 703,607
Sale of common stock for cash (in shares)     407,999      
Sale of common stock for cash     $ 408 272,952   273,360
Sale of convertible preferred stock and warrants for cash (in shares) 2,200          
Sale of convertible preferred stock and warrants for cash $ 871,614     1,127,418   $ 1,999,032
Conversion of preferred stock (in shares) (1,412)   1,882,667      
Conversion of preferred stock to common stock $ (559,418)   $ 1,882 557,536    
Stock-based compensation expense       $ 310,076   $ 310,076
Net loss         $ (2,135,140) (2,135,140)
Balance (in shares) at Dec. 31, 2012 788   18,733,277      
Balance at Dec. 31, 2012 $ 312,196   $ 18,733 $ 25,587,148 $ (24,767,142) 1,150,935
Sale of convertible preferred stock and warrants for cash (in shares)   1,650        
Sale of convertible preferred stock and warrants for cash $ 360,229 $ 1,255,569       $ 1,615,798
Conversion of preferred stock (in shares) (717)   2,048,570      
Conversion of preferred stock to common stock $ (611,839)   $ 2,049 $ 609,790    
Stock-based compensation expense       $ 381,604   $ 381,604
Net loss         $ (2,284,943) (2,284,943)
Balance (in shares) at Dec. 31, 2013 71 1,650 23,765,180      
Balance at Dec. 31, 2013 $ 60,586 $ 1,255,569 $ 23,765 $ 28,239,392 $ (27,052,085) 2,527,227
Sale of common stock for cash upon warrant exercise (in shares)     2,933,333      
Sale of common stock for cash upon warrant exercise     $ 2,933 1,640,400   1,643,333
Issuance of common stock for services (in shares)     50,000      
Issuance of common stock for services     $ 50 20,450   $ 20,500
Conversion of preferred stock (in shares) (71) (1,550) 4,631,428      
Conversion of preferred stock to common stock $ (60,586) $ (1,179,474) $ 4,632 1,235,428    
Stock-based compensation expense       $ 379,103   $ 379,103
Net loss         $ (2,733,555) (2,733,555)
Balance (in shares) at Dec. 31, 2014   100 31,950,813      
Balance at Dec. 31, 2014   $ 76,095 $ 31,951 $ 30,823,769 $ (29,785,640) 1,146,175
Sale of common stock for cash upon warrant exercise (in shares)     3,176,000      
Sale of common stock for cash upon warrant exercise     $ 3,176 870,224   873,400
Issuance of common stock for services (in shares)     378,205      
Issuance of common stock for services     $ 378 $ 99,622   100,000
Net loss           (1,376,657)
Balance at Jun. 30, 2015           $ 2,482,917