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COMMITMENTS AND CONTINGENCIES - Future Minimum Payments for Capital Lease (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Commitments And Contingencies Disclosure [Line Items]    
Capital lease, initial term 36 months 36 months
Future minimum payments for the capital lease    
2021 $ 1,729  
2022 1,547  
2023 1,174  
2024 9  
Total capital lease obligations 4,459  
Less amounts representing interest (1,202)  
Capital lease obligations, net of interest $ 3,257