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STOCKHOLDERS' EQUITY - Restricted stock grants (Details) - Common Stock Class D - Restricted Stock Awards [Member]
 3 Months Ended
Mar. 31, 2023
$ / shares
shares
STOCKHOLDERS' EQUITY  
Shares, Unvested at beginning of year | shares 434,264
Shares, Grants | shares 743,599
Shares, Vested | shares (771,729)
Shares, Forfeited/cancelled/expired | shares 0
Shares, Unvested at end of year | shares 406,134
Average Fair Value at Grant Date, Unvested at beginning of year (in dollars per share) | $ / shares $ 4.27
Average Fair Value at Grant Date, Grants (in dollars per share) | $ / shares 5.13
Average Fair Value at Grant Date, Vested (in dollars per share) | $ / shares 5.04
Average Fair Value at Grant Date, Forfeited/cancelled/expired (in dollars per share) | $ / shares 0
Average Fair Value at Grant Date, Unvested at end of year (in dollars per share) | $ / shares $ 4.39