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ACQUISITIONS - Harpoon Medical, Inc. (Details) - Harpoon Medical - USD ($)
$ in Millions
1 Months Ended 12 Months Ended 24 Months Ended
Dec. 01, 2017
Dec. 31, 2017
Dec. 31, 2018
Nov. 30, 2017
Business Acquisition [Line Items]        
Purchase price subject to certain adjustments $ 119.5      
Cash previously paid for cost method investment       $ 16.0
Net proceeds from sale of previous ownership       $ 8.0
Carrying value at acquisition date 1.5      
Remeasurement gain   $ 6.5    
Potential milestone-driven payments   $ 150.0    
Period to make additional pre-specified milestone-driven payments   10 years    
Liability for estimated fair value of contingent milestone payment   $ 59.7    
Portion of purchase price in escrow $ 10.0      
Escrow fund released period after acquisition 12 months      
Acquisition-related costs     $ 0.4  
Additional research and development expenditures to be incurred prior to product introduction $ 41.4      
Measurement Input, Discount Rate | Minimum | In-process research and development (Note 4)        
Business Acquisition [Line Items]        
Discount rate used to determine fair value 0.180      
Measurement Input, Discount Rate | Maximum | In-process research and development (Note 4)        
Business Acquisition [Line Items]        
Discount rate used to determine fair value 0.190      
Harpoon Medical        
Business Acquisition [Line Items]        
Ownership percentage 6.00%