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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Stockholders' equity:    
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
Series A Preferred Stock [Member]    
Stockholders' equity:    
Preferred stock, par value $ 0.001  
Preferred stock, shares authorized 3,500,000  
Preferred stock, shares issued 0  
Preferred stock, shares outstanding 0  
Series B Preferred Stock [Member]    
Stockholders' equity:    
Preferred stock, par value $ 0.001  
Preferred stock, shares issued 3,588,139  
Preferred stock, shares outstanding 1,975,639