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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share Disclosure [Line Items]        
Net loss - basic and diluted $ (1,191) $ (1,727) $ (5,479) $ (3,832)
Weighted-average shares outstanding - basic and diluted 14,155 13,845 14,059 13,779
Basic and diluted loss per common share $ (0.08) $ (0.12) $ (0.39) $ (0.28)