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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net loss $ (14,095) $ (9,744) $ (47,229) $ (23,700)
Weighted average shares outstanding - Basic and diluted 55,390,247 50,654,690 54,665,776 42,100,504
Loss per share:        
Loss per share, Basic and diluted $ (0.25) $ (0.19) $ (0.86) $ (0.56)