INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Net operating loss carryforwards	$ 182,386	$ 187,449
Tax credit carryforwards	26,519	21,588
Capitalized research & development expenditures	18,919	12,551
Long-term lease liabilities	16,288	21,902
Capitalized software, leasehold improvements and equipment, net	10,923	0
Other	33,485	30,980
Total deferred tax assets	288,520	274,470
Less valuation allowance	(76,821)	(64,877)
Net deferred tax assets	211,699	209,593
Deferred tax liabilities:
Intangible assets, net	(46,571)	(47,016)
Right-of-use assets	(10,588)	(13,919)
Capitalized costs to obtain a contract with a customer	(9,004)	(9,264)
Capitalized software, leasehold improvements and equipment, net	0	(3,839)
Other	(92)	(83)
Total deferred tax liabilities	(66,255)	(74,121)
Net deferred tax assets	$ 145,444	$ 135,472