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LEASES - Summary of Leases Not Yet Commenced (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
2020  
Disclosure of maturity analysis of operating lease payments [line items]  
Leases not yet commenced $ 1,413
2021  
Disclosure of maturity analysis of operating lease payments [line items]  
Leases not yet commenced 2,468
2022  
Disclosure of maturity analysis of operating lease payments [line items]  
Leases not yet commenced 2,731
2023  
Disclosure of maturity analysis of operating lease payments [line items]  
Leases not yet commenced 2,775
2024  
Disclosure of maturity analysis of operating lease payments [line items]  
Leases not yet commenced 2,855
2025  
Disclosure of maturity analysis of operating lease payments [line items]  
Leases not yet commenced $ 478