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Share-based compensation - 2014 Plan PSUs (Details) - 2014 Plan - $ / shares
1 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Performance share units ("PSUs")        
Number of shares        
Granted (in shares)   111,564    
Distributed (in shares)   0 0 0
Undistributed at end of year (in shares)   111,564    
Weighted average grant-date fair value        
Undistributed at beginning of year (in dollars per share)   $ 0.00    
Granted (in dollars per share)   5.76    
Undistributed at end of year (in dollars per share)   $ 5.76 $ 0.00  
Performance share units, 2017 performance objectives | Chief Executive Officer        
Number of shares        
Granted (in shares) 61,560