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SHARE-BASED COMPENSATION - Restricted Stock Units, Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Performance-based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance-based RSUs \| Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	100.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Granted (in shares)	2,045,000	1,900,000	0
Vested (in shares)	298,000	0	0
Unrecognized compensation expense	$ 14,100,000	$ 6,700,000	$ 0
Weighted-average period for recognition of unrecognized compensation expense	2 years 6 months	3 years
Non-cash compensation expense	$ 5,700,000	$ 1,800,000
Restricted Stock Units (RSUs) \| Key Members Of Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	6 months
Compensation expense	$ 1,700,000
Share-based liability	$ 1,700,000
Restricted Stock Units (RSUs) \| Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Restricted Stock Units (RSUs) \| Tranche 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	100.00%
Vesting period	2 years
Time-based RSUs \| Tranche 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Time-based RSUs \| Tranche 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%
Time-based RSUs \| Tranche 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.33%