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Summary of significant accounting policies (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator for basic and diluted earnings per shares        
Net (Loss) Income $ (11,347) $ 408 $ (1,466) $ (4,273)
Denominator        
Denominator for basic earnings per ordinary share - weighted average shares outstanding 25,147,286 24,311,199 24,975,165 24,276,947
Effect of dilutive warrants and earnout shares 0 3,675,640 0 0
Denominator for diluted earnings per ordinary share - weighted average shares outstanding 25,147,286 27,986,839 24,975,165 24,276,947
Basic earnings per ordinary share (in dollars per share) $ (0.45) $ 0.02 $ (0.06) $ (0.18)
Diluted earnings per ordinary share (in dollars per share) $ (0.45) $ 0.01 $ (0.06) $ (0.18)