Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity (Public Offerings) (Details)

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Stockholders' equity (Public Offerings) (Details) (USD $)
1 Months Ended 9 Months Ended
Apr. 30, 2014
May 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Stockholders' equity [Abstract]        
Shares issued during period 8,335,000 11,500,000    
Shares issued during period, price per share $ 2.40 $ 1.25    
Value of shares issued during period $ 20,000,000 $ 14,400,000    
Cost of shares issued during period 1,543,000 1,405,000    
Placement fee percentage 6.50% 7.00%    
Shares issued for warrants exercised     1,161,570 4,025,000
Exercise price of warrants   $ 1.36 $ 1.36  
Value of shares issued for warrants exercised     1,580,000  
Incentive stock options exercised to purchase common shares     39,079  
Total proceeds from stock options exercised to purchase common shares     82,000  
Intrinsic value of stock options exercised to purchase common shares     $ 14,000  
Warrants, number of shares per warrant   0.35 0.35  
Warrants, number of shares   4,025,000    
Underwriter, addtional shares purchased   15.00%