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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net income (loss) from continuing operations $ 715 $ 2,645 $ 1,760 $ (2,913)
Net loss from discontinued operations 0 0 0 (21,124)
Net income (loss) $ 715 $ 2,645 $ 1,760 $ (24,037)
Weighted average of shares outstanding (in shares) 76,487,160 75,282,042 76,056,652 71,318,930
Weighted average restricted shares vested not delivered (in shares) 2,901,223 2,914,917 3,240,947 3,566,816
Total basic weighted average shares outstanding (in shares) 79,388,383 78,196,959 79,297,599 74,885,746
Total weighted average diluted shares outstanding (in shares) 81,132,304 78,196,959 80,443,530 74,885,746
Basic:        
Continuing operations (in usd per share) $ 0.01 $ 0.03 $ 0.02 $ (0.04)
Discontinued operations (in usd per share) 0.00 0.00 0.00 (0.28)
Net income (loss) - basic (in usd per share) 0.01 0.03 0.02 (0.32)
Diluted:        
Continuing operations (in usd per share) 0.01 0.03 0.02 (0.04)
Discontinued operations (in usd per share) 0.00 0.00 0.00 (0.28)
Net income (loss) - diluted (in usd per share) $ 0.01 $ 0.03 $ 0.02 $ (0.32)
Restricted Stock Units        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Dilutive effect of assumed conversion of options to purchase (in shares) 1,408,277 0 882,263 0
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Dilutive effect of assumed conversion of options to purchase (in shares) 329,808 0 262,567 0
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Dilutive effect of assumed conversion of options to purchase (in shares) 5,836 0 1,101 0