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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 31, 2016
Sep. 23, 2014
Jul. 01, 2013
Fair Value of Financial Instruments [Line Items]              
Cash equivalents, money market funds   $ 20,500,000 $ 55,800,000        
Fair value of Milestone Rights         $ 44,700,000    
Property and equipment, net   28,927,000 48,749,000        
Property and equipment impairment   1,259,000 140,412,000 $ 0      
Gain (loss) on property, plant and equipment   $ (600,000)          
Carrying Value              
Fair Value of Financial Instruments [Line Items]              
Property and equipment, net     189,200,000        
Sanofi-Aventis Deutschland GmbH              
Fair Value of Financial Instruments [Line Items]              
Loan facility forgiven date   Nov. 09, 2016          
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          
Milestone Rights Liability | Deerfield              
Fair Value of Financial Instruments [Line Items]              
Long term liability   8,900,000          
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]              
Market discount rate 14.50%            
Long term liability   8,900,000 8,900,000       $ 13,100,000
Fair Value, Inputs, Level 3              
Fair Value of Financial Instruments [Line Items]              
Property, plant, and equipment, fair value     48,800,000        
Property and equipment impairment   700,000 $ (140,412,000)        
Fair Value, Inputs, Level 3 | Milestone Rights Liability              
Fair Value of Financial Instruments [Line Items]              
Fair value of Milestone Rights   $ 18,400,000          
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   111.00%          
Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Sanofi-Aventis Deutschland GmbH              
Fair Value of Financial Instruments [Line Items]              
Market discount rate   11.00%          
Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Senior convertible notes due December 31, 2019              
Fair Value of Financial Instruments [Line Items]              
Market discount rate   12.00%          
Fair Value, Inputs, Level 3 | Income Approach Valuation Technique | Milestone Rights Liability              
Fair Value of Financial Instruments [Line Items]              
Market discount rate   14.50%