FAIR VALUE MEASUREMENTS - SECURITIES WITH UNREALIZED LOSSES (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months - Estimated Fair Value	$ 351,581	$ 75,721
Less Than 12 Months - Gross Unrealized Losses	(972)	(165)
12 Months or Longer - Estimated Fair Value		28,435
12 Months or Longer - Gross Unrealized Losses		(82)
Total - Estimated Fair Value	351,581	104,156
Total - Gross Unrealized Losses	(972)	(247)
U.S. Treasury securities (due in less than one year)
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months - Estimated Fair Value	26,446	11,424
Less Than 12 Months - Gross Unrealized Losses	(22)	(57)
12 Months or Longer - Estimated Fair Value		1,497
12 Months or Longer - Gross Unrealized Losses		(5)
Total - Estimated Fair Value	26,446	12,921
Total - Gross Unrealized Losses	(22)	(62)
Municipal securities (due in less than one year)
Schedule Of Available For Sale Securities [Line Items]
12 Months or Longer - Estimated Fair Value		2,976
12 Months or Longer - Gross Unrealized Losses		(24)
Total - Estimated Fair Value		2,976
Total - Gross Unrealized Losses		(24)
Government-sponsored enterprise securities (due in less than one year)
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months - Estimated Fair Value	94,523	9,845
Less Than 12 Months - Gross Unrealized Losses	(293)	(14)
Total - Estimated Fair Value	94,523	9,845
Total - Gross Unrealized Losses	(293)	(14)
Government-sponsored enterprise securities (due in one to two years)
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months - Estimated Fair Value	10,651
Less Than 12 Months - Gross Unrealized Losses	(35)
Total - Estimated Fair Value	10,651
Total - Gross Unrealized Losses	(35)
Commercial paper (due in less than one year)
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months - Estimated Fair Value	149,584	52,454
Less Than 12 Months - Gross Unrealized Losses	(281)	(92)
Total - Estimated Fair Value	149,584	52,454
Total - Gross Unrealized Losses	(281)	(92)
Corporate notes (due in less than one year)
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months - Estimated Fair Value	39,438	1,998
Less Than 12 Months - Gross Unrealized Losses	(160)	(2)
12 Months or Longer - Estimated Fair Value		23,962
12 Months or Longer - Gross Unrealized Losses		(53)
Total - Estimated Fair Value	39,438	25,960
Total - Gross Unrealized Losses	(160)	$ (55)
Corporate notes (due in one to two years)
Schedule Of Available For Sale Securities [Line Items]
Less Than 12 Months - Estimated Fair Value	30,939
Less Than 12 Months - Gross Unrealized Losses	(181)
Total - Estimated Fair Value	30,939
Total - Gross Unrealized Losses	$ (181)