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SEVERANCE LIABILITY (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2021
Dec. 31, 2020
Postemployment Benefits [Abstract]        
Severance expense $ 306 $ 881    
Severance accrual   $ 771    
Severance period   42 months    
Accrued severance, current     $ 212 $ 339
Accrued severance, noncurrent     $ 130 $ 241