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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, 2016
Mar. 31, 2015
Earnings Per Share Disclosure [Line Items]    
Net loss - basic and diluted $ (4,288) $ (2,105)
Weighted-average shares outstanding - basic and diluted 13,963 13,738
Basic and diluted loss per common share $ (0.31) $ (0.15)