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Calculations of Basic and Diluted Loss per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share Disclosure [Line Items]    
Net loss - basic and diluted $ (2,105)us-gaap_NetIncomeLoss $ (2,929)us-gaap_NetIncomeLoss
Weighted-average shares outstanding - basic and diluted 13,738us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 13,274us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Basic and diluted loss per common share $ (0.15)us-gaap_EarningsPerShareBasicAndDiluted $ (0.22)us-gaap_EarningsPerShareBasicAndDiluted