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Net Loss Per Share - Computation of Basic and Diluted Net (Loss) Income Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator:        
Loss from continuing operations $ (4,926) $ (7,492) $ (19,969) $ (20,138)
Income from discontinued operations, net of income taxes (6) 96 (63) 116
Net loss $ (4,932) $ (7,396) $ (20,032) $ (20,022)
Denominator: (thousands)        
Weighted average common shares outstanding 51,151 51,082 51,105 50,851
Basic and diluted net loss per common share        
Continuing operations $ (0.10) $ (0.15) $ (0.39) $ (0.40)
Discontinued operations $ 0.00 $ 0.00 $ 0.00 $ 0.00
Net loss per common share $ (0.10) $ (0.14) $ (0.39) $ (0.39)