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LEASES - Additional Information (Details) - COVID-19 - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Lessee, Lease, Description [Line Items]    
Deferred rent   $ 1.4
Payments for deferred rent   $ 0.4
Forecast    
Lessee, Lease, Description [Line Items]    
Payments for deferred rent $ 1.0