MARKETABLE SECURITIES - Available for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Short-term AFS securities
Amortized cost, short-term AFS securities	$ 452,706	$ 385,611
Gross unrealized gains, short-term AFS securities	20	1,111
Gross unrealized losses, short-term AFS securities	(1,206)	(10)
Fair value, short-term AFS securities	451,520	386,712
Long-term AFS securities
Amortized cost, long-term AFS securities	598,793	523,640
Gross unrealized gains, long-term AFS securities	7	2,101
Gross unrealized losses, long-term AFS securities	(6,958)	(46)
Fair value, long-term AFS securities	591,842	525,695
U.S. Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	266,510	200,604
Gross unrealized gains, short-term AFS securities	12	660
Gross unrealized losses, short-term AFS securities	(685)	(1)
Fair value, short-term AFS securities	265,837	201,263
Long-term AFS securities
Amortized cost, long-term AFS securities	278,833	289,530
Gross unrealized gains, long-term AFS securities	4	1,372
Gross unrealized losses, long-term AFS securities	(3,556)	(3)
Fair value, long-term AFS securities	275,281	290,899
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	183,612	185,007
Gross unrealized gains, short-term AFS securities	8	451
Gross unrealized losses, short-term AFS securities	(495)	(9)
Fair value, short-term AFS securities	183,125	185,449
Long-term AFS securities
Amortized cost, long-term AFS securities	312,119	227,235
Gross unrealized gains, long-term AFS securities	3	724
Gross unrealized losses, long-term AFS securities	(3,333)	(43)
Fair value, long-term AFS securities	308,789	227,916
U.S. governmental agency securities
Short-term AFS securities
Amortized cost, short-term AFS securities	2,584
Gross unrealized gains, short-term AFS securities	0
Gross unrealized losses, short-term AFS securities	(26)
Fair value, short-term AFS securities	2,558
Long-term AFS securities
Amortized cost, long-term AFS securities	7,841	6,875
Gross unrealized gains, long-term AFS securities	0	5
Gross unrealized losses, long-term AFS securities	(69)	0
Fair value, long-term AFS securities	$ 7,772	$ 6,880

Debt Securities, Available-for-sale Securities, Current

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Debt Securities, Available-for-sale, Gross Unrealized Gains, Current

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Topic 326
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