INCOME TAXES - Reconciliation between Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Computed expected income tax benefit	$ (39,568)	$ (60,120)	$ (60,674)
State income taxes - net of federal income tax benefit	(6,175)	(10,197)	(17,171)
Change in valuation allowance	42,855	81,251	94,062
Non-deductible expenses	4,489	2,687	2,623
Non-deductible base erosion expenses	11,403	0	0
Non-deductible officers’ compensation	12,775	3,648	8,345
Stock-based compensation	(9,678)	135	(30,523)
Tax credits (federal and state)	(18,226)	(16,863)	(16,957)
Foreign rate differential	40	35	35
Other	3,358	(110)	(3,498)
Provision for (benefit from) income taxes	$ 1,273	$ 466	$ (23,758)