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Reconciliation of Numerator and Denominator Used in Computation of Basic and Diluted Net Income Loss per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:                      
Net loss $ (5,860) $ (20,501) $ (6,724) $ (10,252) $ (1,716) $ (3,460) $ (1,907) $ (8,834) $ (43,337) $ (15,917) $ (16,982)
Effect of revaluation of warrant liability                   (2,059)  
Adjusted net loss used for dilution calculation                 $ (43,337) $ (17,976) $ (16,982)
Denominator:                      
Basic weighted average number of common shares outstanding                 67,569 54,515 48,050
Effect of dilutive potential common shares resulting from warrants accounted for as liabilities                   546  
Diluted weighted average number of common shares outstanding                 67,569 55,061 48,050
Basic $ (0.08) $ (0.29) $ (0.10) $ (0.17) $ (0.03) $ (0.06) $ (0.04) $ (0.17) $ (0.64) $ (0.29) $ (0.35)
Diluted $ (0.10) $ (0.29) $ (0.10) $ (0.17) $ (0.07) $ (0.08) $ (0.10) $ (0.17) $ (0.64) $ (0.33) $ (0.35)