Annual report pursuant to Section 13 and 15(d)

TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES - Narrative (Details)

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TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction      
Stock options outstanding (in shares)   4,935,732 6,898,346
Manager      
Related Party Transaction      
Termination payment $ 10.7    
Affiliates      
Related Party Transaction      
Number of shares owned by related party (in shares)   9,000,000.0  
Stock options outstanding (in shares)   3,600,000  
Reimbursement of employee services   $ 0.1 $ 0.2
Transition Services Agreement | Manager      
Related Party Transaction      
Expenses incurred   $ 0.0 $ 0.1