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Stockholders' Equity (Deficit) - Stock-Based Compensation Related to Stock Options, Restricted Stock Awards, Restricted Stock Unit, and Employee Stock Purchases (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense $ 3,597,000 $ 3,783,000 $ 3,069,000
Research and Development [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense 1,538,000 1,801,000 1,331,000
General and Administrative [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation expense $ 2,059,000 $ 1,982,000 $ 1,738,000