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Summary of significant accounting policies (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share Basic And Diluted [Line Items]        
Net (Loss) Income $ (1,938) $ 13,120 $ (11,076) $ (2,911)
Denominator        
Denominator for basic earnings per ordinary share - weighted average shares outstanding 25,426,250 24,364,014 25,127,179 24,306,288
Effect of dilutive warrants, unit purchase options and contingently issuable shares 5,399,081 4,273,152 4,607,484 3,954,980
Denominator for diluted earnings per ordinary share - weighted average shares outstanding 30,825,331 28,637,166 29,734,663 28,261,268
Basic earnings per ordinary share (in dollars per share) $ (0.08) $ 0.54 $ (0.44) $ (0.12)
Diluted earnings per ordinary share (in dollars per share) $ (0.08) $ 0.46 $ (0.44) $ (0.12)