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Fair Value Measurements - Schedule of Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value $ 72,454 $ 166,038
Total liabilities measured at fair value 0 0
Level 1 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 72,454 166,038
Level 1 | U.S. government agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 0  
Level 1 | Derivative liabilities associated with the Medicis settlement    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total liabilities measured at fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 53,721 0
Total liabilities measured at fair value 0 0
Level 2 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 0 0
Level 2 | U.S. government agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 53,721  
Level 2 | Derivative liabilities associated with the Medicis settlement    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total liabilities measured at fair value 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 0 0
Total liabilities measured at fair value 1,481 1,541
Level 3 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 0 0
Level 3 | U.S. government agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 0  
Level 3 | Derivative liabilities associated with the Medicis settlement    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total liabilities measured at fair value 1,481 1,541
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 126,175 166,038
Total liabilities measured at fair value 1,481 1,541
Recurring | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 72,454 166,038
Recurring | U.S. government agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total assets measured at fair value 53,721  
Recurring | Derivative liabilities associated with the Medicis settlement    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total liabilities measured at fair value $ 1,481 $ 1,541