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SUBSEQUENT EVENTS - Director Fees (Details) - Non-employee director - 2021 Plan
 1 Months Ended
Aug. 31, 2021
USD ($)
Subsequent Event [Line Items]  
Fees as cash retainer for board service $ 25,000
Additional annual cash retainers for each member of compensation committee or nominating and governance committee 2,000
Additional annual cash retainers for the chairman of compensation committee or nominating and governance committee 5,000
Additional annual cash retainers for each member of audit committee 8,000
Additional annual cash retainers for the chairman of audit committee 45,000
Value of stock option to purchase shares of common stock $ 75,000
Vesting period 1 year
Threshold number of in-person meetings to be entitled to additional compensation 4
Threshold number of telephonic meetings to be entitled to additional compensation 12
Additional compensation in the event directors are required to attend additional telephonic meeting beyond the 12 telephonic meeting thresholds $ 500
Additional compensation in the event directors are required to attend additional in-person meeting beyond the four in-person meeting threshold $ 1,000