MARKETABLE SECURITIES - Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Interest receivable	$ 2,700	$ 1,200
Amortized Cost	264,736	253,764
Gross Unrealized Gains	22	71
Gross Unrealized Losses	(2,862)	(5,394)
Estimated Fair Market Value	261,896	248,441
Investments due in 3 months or less:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,088	21,803
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(207)	(135)
Estimated Fair Market Value	35,881	21,668
Investments due in 4-12 months:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,377	173,833
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(664)	(4,019)
Estimated Fair Market Value	38,717	169,814
Investments due in 12 months or greater:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	189,271	58,128
Gross Unrealized Gains	18	71
Gross Unrealized Losses	(1,991)	(1,240)
Estimated Fair Market Value	187,298	56,959
Corporate securities | Investments due in 3 months or less:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,088	21,803
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(207)	(135)
Estimated Fair Market Value	35,881	21,668
Corporate securities | Investments due in 4-12 months:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,377	173,833
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(664)	(4,019)
Estimated Fair Market Value	38,717	169,814
Corporate securities | Investments due in 12 months or greater:
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	189,271	58,128
Gross Unrealized Gains	18	71
Gross Unrealized Losses	(1,991)	(1,240)
Estimated Fair Market Value	$ 187,298	$ 56,959