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Subsequent Events (Details)
May. 09, 2016
USD ($)
country
Jul. 31, 2015
USD ($)
PDL BioPharma | Scenario 2    
Subsequent Event [Line Items]    
Contract amount   $ 100,000,000
Subsequent event | Affiliated entity | ARIAD Pharmaceuticals    
Subsequent Event [Line Items]    
Number of other countries in which Iclusig is commercialized | country 22  
Consideration received for sale of stock $ 140,000,000  
Subsequent event | PDL BioPharma | Scenario 2    
Subsequent Event [Line Items]    
Amount of additional funding (up to) 40,000,000  
Subsequent event | License agreement | Incyte    
Subsequent Event [Line Items]    
Additional milestone payments (up to) 135,000,000  
Contribution receivable for funding trials in 2016 (up to) 7,000,000  
Contribution receivable for funding trials in 2017 (up to) $ 7,000,000.0  
Potential extension period for pediatric exclusivity 6 months  
Term of license fee 7 years  
Subsequent event | License agreement | Incyte | Minimum    
Subsequent Event [Line Items]    
Royalty payment rate (as a percent) 32.00%  
Subsequent event | License agreement | Incyte | Maximum    
Subsequent Event [Line Items]    
Royalty payment rate (as a percent) 50.00%