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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
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share Disclosure [Line Items]    
Net loss - basic and diluted $ (11,598) $ (1,331)
Weighted-average shares outstanding - basic and diluted 16,601 14,396
Basic and diluted loss per common share $ (0.70) $ (0.09)