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Collaboration and Other Agreements - Provention Bio, Inc. (Details)
3 Months Ended
May 31, 2018
USD ($)
performance_obligation
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
Collaboration And Other Agreements [Line Items]          
Revenues   $ 13,682,000 $ 9,662,000    
Fair Value   $ 77,793,000     $ 89,284,000
Provention          
Collaboration And Other Agreements [Line Items]          
Number of performance obligations | performance_obligation 2        
Collaborative agreement transaction price $ 6,100,000        
Number of shares available under warrants (in shares) | shares 2,432,688        
License Agreement | Provention | Provention PRV-3279          
Collaboration And Other Agreements [Line Items]          
Warrant to purchase shares of common stock, exercise price (in dollars per share) | $ / shares $ 2.50        
Potential development and regulatory milestone payments under agreement $ 65,000,000.0        
Potential commercial milestone payments under agreement $ 225,000,000.0        
Asset Purchase Agreement | Provention | Provention PRV-031          
Collaboration And Other Agreements [Line Items]          
Warrant to purchase shares of common stock, exercise price (in dollars per share) | $ / shares $ 2.50        
Potential development and regulatory milestone payments under agreement $ 170,000,000.0        
Potential commercial milestone payments under agreement 225,000,000.0        
Potential milestone payments to third parties $ 1,300,000        
Revenues From License Agreements | Provention          
Collaboration And Other Agreements [Line Items]          
Revenues       $ 6,100,000