SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Equity Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Cost	$ 63,383	$ 99,859
Gross Unrealized Gain	14,819	264,879
Gross Unrealized Loss	(16,594)	(2,960)
Fair Value	61,608	361,778
Equity securities - Life Sciences Portfolio
Debt and Equity Securities, FV-NI [Line Items]
Cost	28,498	56,037
Gross Unrealized Gain	14,815	262,811
Gross Unrealized Loss	(617)	(1,488)
Fair Value	42,696	317,360
Equity securities - other common stock
Debt and Equity Securities, FV-NI [Line Items]
Cost	34,885	43,822
Gross Unrealized Gain	4	2,068
Gross Unrealized Loss	(15,977)	(1,472)
Fair Value	$ 18,912	$ 44,418