Annual report pursuant to Section 13 and 15(d)

RELATED PARTY TRANSACTIONS - Narrative (Details)

v3.20.4
RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
Jun. 25, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]          
Maximum outstanding borrowings   $ 50,000,000      
Outstanding borrowings     $ 0 $ 8,400,000  
Wesco US LLC          
Related Party Transaction [Line Items]          
Outstanding borrowings       $ 8,400,000  
Interest rate (as a percent)       5.95%  
Interest expense   200,000   $ 500,000 $ 300,000
Wesco US LLC | Revolving Credit Facility          
Related Party Transaction [Line Items]          
Maximum outstanding borrowings $ 9,000,000.0        
Remaining balance forgiven   $ 3,400,000      
Wesco US LLC | LIBOR | Revolving Credit Facility          
Related Party Transaction [Line Items]          
Basis spread on variable rate (as a percent) 4.00%        
Watermill          
Related Party Transaction [Line Items]          
Due to related parties     900,000    
Related party expenses     400,000    
Watermill | Swerve          
Related Party Transaction [Line Items]          
Related party expenses     $ 800,000