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COMMITMENTS AND CONTINGENCIES - Future minimum lease payments under non-cancelable operating leases (Details)

v3.21.1
COMMITMENTS AND CONTINGENCIES - Future minimum lease payments under non-cancelable operating leases (Details)
Dec. 31, 2020
USD ($)
Future minimum lease payments under non-cancelable operating leases  
2021 $ 4,945,000
2022 3,591,000
2023 2,755,000
2024 2,308,000
2025 1,811,000
Thereafter 4,447,000
Total minimum lease payments $ 19,857,000