SHARE-BASED COMPENSATION PLANS - Nonvested Shares of Series A Preferred Stock (Details) - Series A and Series A-1 Preferred Stock shares in Millions	Jun. 30, 2021 $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	0.5
Outstanding, ending balance (in shares) | shares	0.5
Weighted Average Grant Date Fair Value
Outstanding and nonvested, beginning balance (in dollars per share) | $ / shares	$ 3.55
Outstanding and nonvested, ending balance (in dollars per share) | $ / shares	$ 3.55