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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2016
May 31, 2016
Dec. 31, 2015
Sep. 23, 2014
Jul. 01, 2013
Fair Value of Financial Instruments [Line Items]          
Cash equivalents, money market funds $ 33,700,000   $ 55,800,000    
Debt facility principal amount 27,690,000   27,690,000    
Fair value of Milestone Rights   $ 44,700,000      
Carrying value 27,629,000   $ 27,613,000    
License and Collaboration Agreement with Sanofi          
Fair Value of Financial Instruments [Line Items]          
Maximum secured loan facility       $ 175,000,000  
License and Collaboration Agreement with Sanofi | Sanofi-Aventis Deutschland GmbH          
Fair Value of Financial Instruments [Line Items]          
Maximum secured loan facility 175,000,000        
Carrying value 71,500,000        
Estimated fair value 61,800,000        
Senior convertible notes due December 31, 2019 | Deerfield          
Fair Value of Financial Instruments [Line Items]          
Debt facility principal amount 55,000,000        
Less portion of commitment asset | Senior convertible notes due December 31, 2019 | Deerfield          
Fair Value of Financial Instruments [Line Items]          
Debt facility principal amount 20,000,000        
Milestone Rights Liability | Deerfield | Maximum          
Fair Value of Financial Instruments [Line Items]          
Contingent liability for milestone payments         $ 90,000,000
Milestone Rights Liability | Senior convertible notes due December 31, 2019 | Deerfield          
Fair Value of Financial Instruments [Line Items]          
Long term liability 8,900,000       $ 13,100,000
Fair Value, Inputs, Level 3 | Milestone Rights Liability          
Fair Value of Financial Instruments [Line Items]          
Fair value of Milestone Rights $ 15,300,000        
Fair Value, Inputs, Level 3 | Market Approach Valuation Technique | 5.75% Senior convertible notes due August 15, 2018 | Convertible Debt Securities          
Fair Value of Financial Instruments [Line Items]          
Fair value assumption, risk-free rate 20.00%        
Fair value assumption, stock price volatility 90.00%        
Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Sanofi-Aventis Deutschland GmbH          
Fair Value of Financial Instruments [Line Items]          
Market discount rate 10.00%        
Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Senior convertible notes due December 31, 2019          
Fair Value of Financial Instruments [Line Items]          
Debt facility principal amount $ 20,000,000        
Market discount rate 12.00%        
Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Less portion of commitment asset | Senior convertible notes due December 31, 2019          
Fair Value of Financial Instruments [Line Items]          
Debt facility principal amount $ 40,000,000        
Market discount rate 11.00%        
Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Milestone Rights Liability          
Fair Value of Financial Instruments [Line Items]          
Market discount rate 13.50%