LEASES - Operating and Financing Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease costs	$ 0.2	$ 0.3
Finance leases, amortization expense and interest	0.1	0.1
Maximum
Lessee, Lease, Description [Line Items]
Short-term lease costs	$ 0.1	$ 0.1