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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, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share Disclosure [Line Items]            
Net loss– basic and diluted $ (11,513) $ (4,867) $ (6,057) $ (11,598) $ (16,380) $ (17,655)
Weighted-average shares outstanding – basic and diluted 20,545   20,327   20,527 18,474
Basic and diluted loss per common share $ (0.56)   $ (0.30)   $ (0.80) $ (0.96)