Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity (Details)

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Stockholders' equity (Details) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
Oct. 16, 2013
Equity [Abstract]      
Common stock, shares authorized (in shares) 75,000,000 75,000,000  
Common stock, par value per share (in dollars per share) $ 0.0001 $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000  
Preferred stock, par value per share (in dollars per share) $ 0.0001 $ 0.0001  
Common stock, shares outstanding (in shares) 24,972,515 24,940,195  
Preferred stock, shares outstanding (in shares) 0 0