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MERGER AND ACQUISITION - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
May 06, 2020
Apr. 30, 2020
Dec. 31, 2020
RDD Merger      
Business Acquisition [Line Items]      
Common stock consideration (in shares)   37,860,510  
Number of options outstanding (in shares)   1,014,173  
Value of common stock acquired   $ 26.6  
Liabilities assumed   1.3  
Net assets received   $ 0.1  
Naia Acquisition      
Business Acquisition [Line Items]      
Common stock consideration (in shares) 4,835,438    
Cash consideration $ 2.1    
Pre-payment consideration for operating costs 0.1    
Potential future milestone payments 80.4    
Value of common stock acquired 2.2    
Liabilities assumed $ 0.1    
RDD Merger and Naia Acquisition      
Business Acquisition [Line Items]      
Purchase of in-process research and development expense     $ 32.3