FAIR VALUE MEASUREMENTS - Schedule of Company's Financial Instruments of Carrying Values and Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost Basis	$ 754,386	$ 566,366
Allowance for Credit Losses	0	0
Net Carrying Amount	754,386	566,366
Gross Unrealized Gains	20	233
Gross Unrealized Losses	(1,512)	(29)
Aggregate Fair Value	752,894	566,570
U.S. Government Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost Basis	82,043	131,623
Allowance for Credit Losses	0	0
Net Carrying Amount	82,043	131,623
Gross Unrealized Gains	0	123
Gross Unrealized Losses	(366)	0
Aggregate Fair Value	81,677	131,746
Corporate Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost Basis	631,815	407,466
Allowance for Credit Losses	0	0
Net Carrying Amount	631,815	407,466
Gross Unrealized Gains	19	105
Gross Unrealized Losses	(1,097)	(28)
Aggregate Fair Value	630,737	407,543
Foreign Issuer Debt Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost Basis	40,528	27,277
Allowance for Credit Losses	0	0
Net Carrying Amount	40,528	27,277
Gross Unrealized Gains	1	5
Gross Unrealized Losses	(49)	(1)
Aggregate Fair Value	$ 40,480	$ 27,281

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

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