XML 133 R90.htm IDEA: XBRL DOCUMENT v3.21.1
LEASES - Narrative (Details) - Copler
 12 Months Ended
Dec. 31, 2020
extensionPeriod
Disclosure of lessee, leases [Line Items]  
Leases, non-cancellable lease 15 years
Leases, extension period 2 years
Leases, number of extension periods 4