INCOME TAX - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Operating expenses not currently deductible	$ 16,639	$ 9,084
Stock option and other employee benefit plans	19,596	17,446
Loss and credit carryforwards	18,604	27,199
Deferred revenue	4,717	807
Total deferred income tax assets	59,556	54,536
Valuation allowance	0	(1,490)
Total deferred income tax assets, net of valuation allowance	59,556	53,046
Deferred income tax liabilities:
Intangible assets	(266,827)	(76,766)
Property and equipment	(12,272)	(9,918)
Prepaid expenses	(8,542)	(6,869)
Total deferred income tax liabilities	(287,641)	(93,553)
Net deferred income tax liabilities	$ (228,085)	$ (40,507)