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LEASES - Reported under ASC 842 and ASC 840 (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Future minimum lease payments for non-cancellable operating leases    
Remaining period in 2021 $ 98  
2022 391  
2023 359  
Total operating lease payment 848  
Less: discount to present value 37  
Total operating lease liabilities 811  
Less: current operating lease liabilities 365 $ 403
Noncurrent operating lease liabilities $ 446