Registration of securities issued in business combination transactions

INCOME TAXES - Narrative (Details)

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INCOME TAXES - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, not subject to expiration     $ 228.3
Federal and state research and development tax credit carryforwards $ 13.5    
Federal tax      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 273.8 $ 197.7  
State and local jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 243.2 $ 184.2