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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share Disclosure [Line Items]        
Net loss - basic and diluted $ (2,096) $ (1,191) $ (3,427) $ (5,479)
Weighted-average shares outstanding - basic and diluted 14,456 14,155 14,426 14,059
Basic and diluted loss per common share $ (0.14) $ (0.08) $ (0.24) $ (0.39)