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Calculations of Basic and Diluted Income (Loss) Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share Disclosure [Line Items]    
Net income (loss) - basic and diluted $ (632) $ 1,344
Weighted-average shares outstanding - basic 12,761 12,432
Effect of dilutive securities:    
Stock options   333
Weighted-average shares outstanding - diluted 12,761 12,765
Basic income (loss) per common share $ (0.05) $ 0.11
Diluted income (loss) per common share $ (0.05) $ 0.11