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COMMITMENTS AND CONTINGENCIES - Future minimum lease payments under non-cancelable operating leases (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Future minimum lease payments under non-cancelable operating leases  
Remainder of 2021 $ 3,665
2022 3,591
2023 2,755
2024 2,308
2025 1,811
2026 1,846
Thereafter 2,601
Total minimum lease payments $ 18,577