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
Sep. 30, 2015
Sep. 30, 2014
Stockholders Equity [Line Items]      
Shares issued during period 8,335,000    
Shares issued during period, price per share $ 2.40    
Value of shares issued during period $ 20,000,000    
Cost of shares issued during period $ 1,543,000    
Placement fee percentage 6.50%    
Shares issued for warrants exercised   0 1,161,570
Exercise price of warrants     $ 1.36
Value of shares issued for warrants exercised     $ 1,580,000
Incentive stock options exercised to purchase common shares     39,079
Average exercise price     $ 2.09
Total proceeds from stock options exercised to purchase common shares     $ 82,000
Intrinsic value of stock options exercised to purchase common shares     $ 14,000