EMPLOYEE EQUITY-BASED COMPENSATION - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Shares
Outstanding, beginning balance (in shares)	7,192,540	8,045,461
Granted (in shares)	140,000	489,804
Forfeited (in shares)	(208,569)	(370,106)
Exercised (in shares)	(6,105)	(426,762)
Expired (in shares)	(1,709,205)	(545,857)
Outstanding, ending balance (in shares)	5,408,661	7,192,540	8,045,461
Exercisable, ending balance (in shares)	4,263,496
Weighted Average Exercise Price per Share
Outstanding, beginning balance (in dollars per share)	$ 13.89	$ 14.18
Granted (in dollars per share)	3.05	7.09
Forfeited (in dollars per share)	12.58	14.04
Exercised (in dollars per share)	1.04	3.79
Expired (in dollars per share)	10.96	19.85
Outstanding, ending balance (in dollars per share)	14.60	$ 13.89	$ 14.18
Exercisable, ending balance ( in dollars per share)	$ 15.39
Intrinsic value of options exercised	$ 0.0	$ 3.3	$ 23.5
Fair value of shares vesting	$ 7.2	$ 11.1	$ 9.0

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.