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Investment in Inex Bio, Inc - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 30, 2015
Apr. 30, 2015
May. 31, 2012
Apr. 30, 2012
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2014
Business Acquisition [Line Items]                  
Number of shares acquired during period     57,000            
Stock issued during period, value, acquisitions     $ 249,000            
Outstanding shares acquired, percentage     22.20%            
Percentage of fully diluted shares acquired     17.40%            
Percentage of equity owned by partners                 7.00%
Proceeds from exercise of warrants             $ 7,340,000    
Stock-based compensation expense         $ 36,103,000 $ 29,000 $ 140,667,000 $ 196,000  
Common Class A                  
Business Acquisition [Line Items]                  
Stock price of warrants         $ 2.44   $ 2.44    
Inex Bio Holdings                  
Business Acquisition [Line Items]                  
Percentage of equity owned by partners         50.00%   50.00%    
Payments to acquire business             $ 6,518,000    
Stock price of warrants $ 10.72                
Term of warrants after closing date of the purchase agreement 15 days                
Expected volatility rate 80.00%                
Stock-based compensation expense             22,747,000    
Cash based compensation             $ 5,418,000    
Inex Bio Holdings | Common Class A                  
Business Acquisition [Line Items]                  
Warrants issued to acquire shares             2,609,520    
Common stock exercise price         $ 2.00   $ 2.00    
Proceeds from exercise of warrants   $ 5,215,000              
Eragon Ventures, LLC                  
Business Acquisition [Line Items]                  
Number of shares acquired during period             220,000    
Percentage of equity owned by partners         50.00%   50.00%    
Percentage shares acquired         67.30%   67.30%    
Payments to acquire business             $ 1,100,000    
Other Owner Of Inex Bio Inc                  
Business Acquisition [Line Items]                  
Payments to acquire business             $ 1,482,000    
Stock price of warrants $ 10.72                
Term of warrants after closing date of the purchase agreement 15 days                
Expected volatility rate 80.00%                
Reacquired rights period             4 years    
Other Owner Of Inex Bio Inc | Common Class A                  
Business Acquisition [Line Items]                  
Warrants issued to acquire shares             593,072    
Common stock exercise price         $ 2.00   $ 2.00    
Proceeds from exercise of warrants   $ 1,185,000              
Inex license agreement                  
Business Acquisition [Line Items]                  
Milestone payment amount             $ 0 $ 0  
Percentage of royalty on net sales       5.00%          
Inex license agreement | Up front fee                  
Business Acquisition [Line Items]                  
License fees received       $ 300,000          
Inex license agreement | Maximum                  
Business Acquisition [Line Items]                  
Milestone payment amount       $ 775,000