Quarterly report pursuant to Section 13 or 15(d)

SEVERANCE LIABILITY (Details)

v3.21.2
SEVERANCE LIABILITY (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2021
Dec. 31, 2020
Postemployment Benefits [Abstract]        
Severance expense $ 306 $ 881    
Severance accrual   $ 771    
Severance period   42 months    
Accrued severance, current     $ 223 $ 339
Accrued severance, noncurrent     $ 72 $ 241