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Loss per share - Schedule of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]    
Net loss $ (12,725) $ (6,772)
Weighted average shares outstanding - Basic and diluted 53,811,688 27,468,214
Loss per share:    
Loss per share, Basic and diluted $ (0.24) $ (0.25)