EQUITY AND CASH COMPENSATION UNDER THE PPG AGREEMENTS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Long-term Purchase Commitment [Line Items]
Percent of services payable in cash or shares	50.00%
Issuance of common stock in connection with materials and license agreements (in shares)	0	0
Charges to expense for cash portion of reimbursement of expenses	$ 1.5	$ 1.5
New OLED Materials Agreement and OLED Materials Agreement [Member] | Weighted Average
Long-term Purchase Commitment [Line Items]
Minimum average closing price of common stock (in dollars per share)	$ 20.00	$ 20.00	$ 20.00