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Calculations of Basic and Diluted Loss per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share Disclosure [Line Items]        
Net loss- basic and diluted $ (6,057) $ (2,096) $ (17,655) $ (3,427)
Weighted-average shares outstanding - basic and diluted 20,327 14,456 18,474 14,426
Basic and diluted loss per common share $ (0.30) $ (0.14) $ (0.96) $ (0.24)