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ACQUISITIONS AND PRO FORMA RESULTS (Asset Acquisition, Narrative) (Details)
 3 Months Ended 12 Months Ended
Sep. 09, 2019
USD ($)
asset
Jan. 04, 2019
USD ($)
asset
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule Of Asset Acquisition [Line Items]            
In-process research and development expenses       $ 64,916,000 $ 0 $ 0
Rebound            
Schedule Of Asset Acquisition [Line Items]            
Upfront payment $ 67,100,000          
Contingent development milestone payments commitment (up to) $ 35,000,000.0          
Number of assets acquired | asset 1          
Remaining net assets acquired $ 7,200,000          
Development milestone payment, to be paid     $ 5,000,000.0 $ 5,000,000.0    
In-process research and development expenses     $ 5,000,000.0      
Rebound | Cash and Cash Equivalents            
Schedule Of Asset Acquisition [Line Items]            
Remaining net assets acquired 2,100,000          
Rebound | Deferred Tax Asset            
Schedule Of Asset Acquisition [Line Items]            
Remaining net assets acquired 4,200,000          
Rebound | IPR&D            
Schedule Of Asset Acquisition [Line Items]            
Upfront payment $ 59,900,000          
ISC | Enabling technology license            
Schedule Of Asset Acquisition [Line Items]            
Number of assets acquired | asset   1        
Upfront payment, intangible assets   $ 1,700,000        
Option to acquire, period subsequent to first commercial sale   4 years        
Maximum future purchase price, if circumstances met (not to exceed)   $ 80,000,000.0