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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share Disclosure [Line Items]        
Net loss - basic and diluted $ (1,727) $ (3,202) $ (3,832) $ (6,131)
Weighted-average shares outstanding - basic and diluted 13,845 13,483 13,779 13,379
Basic and diluted loss per common share $ (0.12) $ (0.24) $ (0.28) $ (0.46)