Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES - Narrative (Details)

v3.21.1
COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Commitments [Line Items]      
Rent expense $ 2.5 $ 2.0 $ 1.9
Minimum processing fees to be paid over next four years $ 7.0    
Minimum      
Other Commitments [Line Items]      
Operating leases, terms 2 years    
Maximum      
Other Commitments [Line Items]      
Operating leases, terms 16 years