FAIR VALUE MEASUREMENTS - Schedule of Company's Financial Instruments of Carrying Values and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost Basis	$ 719,947	$ 566,366
Allowance for Credit Losses	0	0
Net carrying amount	719,947	566,366
Gross Unrealized Gains	7	233
Gross Unrealized Losses	(1,451)	(29)
Aggregate Fair Value	718,503	566,570
U.S. Government Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost Basis	138,791	131,623
Allowance for Credit Losses	0	0
Net carrying amount	138,791	131,623
Gross Unrealized Gains	0	123
Gross Unrealized Losses	(194)	0
Aggregate Fair Value	138,597	131,746
Corporate Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost Basis	540,736	407,466
Allowance for Credit Losses	0	0
Net carrying amount	540,736	407,466
Gross Unrealized Gains	6	105
Gross Unrealized Losses	(1,181)	(28)
Aggregate Fair Value	539,561	407,543
Foreign Issuer Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost Basis	40,420	27,277
Allowance for Credit Losses	0	0
Net carrying amount	40,420	27,277
Gross Unrealized Gains	1	5
Gross Unrealized Losses	(76)	(1)
Aggregate Fair Value	$ 40,345	$ 27,281

Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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