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Income (loss) per share - Schedule of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net income (loss) from continuing operations $ 1,045 $ (5,558)
Net loss from discontinued operations 0 (21,124)
Net income (loss) $ 1,045 $ (26,682)
Weighted average of shares outstanding (in shares) 75,621,360 67,311,784
Weighted average restricted shares vested not delivered (in shares) 3,476,066 4,225,959
Total basic weighted average shares outstanding (in shares) 79,097,426 71,537,743
Total weighted average diluted shares outstanding (in shares) 80,063,989 71,537,743
Basic:    
Continuing operations (in usd per share) $ 0.01 $ (0.08)
Discontinued operations (in usd per share) 0.00 (0.30)
Net income (loss) - basic and diluted (in usd per share) $ 0.01 $ (0.37)
Restricted Stock Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Dilutive effect of assumed conversion of options to purchase common stock (in shares) 769,495 0
Warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Dilutive effect of assumed conversion of options to purchase common stock (in shares) 197,068 0