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Loss per share - Schedule of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]    
Net income (loss) from continuing operations $ 3,192 $ (31,706)
Net loss from discontinued operations (21,124) (21,500)
Net loss $ (17,932) $ (53,206)
Denominator:    
Weighted average shares outstanding (in shares) 73,470,197 55,648,235
Weighted average restricted shares vested not delivered (in shares) 3,235,680 5,504,834
Basic (in shares) 76,705,877 61,153,069
Diluted (in shares) 76,705,877 61,153,069
Basic and diluted:    
Income (loss) from continuing operations, per basic and diluted share (in dollars per share) $ 0.04 $ (0.52)
Income (loss) from discontinued operations, per basic and diluted share (in dollars per share) (0.28) (0.35)
Basic and diluted loss per share (in dollars per share) $ (0.23) $ (0.87)