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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount excluding accrued interest, 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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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FAIR VALUE MEASUREMENTS - Carrying Values and Estimated Fair Values (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Financial assets:
Cash and cash equivalents	$ 429,075		$ 1,166,011
Level 1 \| Fair Value, Recurring
Financial assets:
Cash and cash equivalents	429,075		1,166,011
Short-term investments	1,023,564		664,275
Restricted cash	541		1,348
Derivative instrument	0		0
Level 1 \| Convertible Debt \| Convertible Notes due 2026 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments			82,449
Level 1 \| Convertible Debt \| Convertible Notes due 2030 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	2,314,641		2,172,782
Level 1 \| Notes Payable, Other Payables \| Samarium Project Loan \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	0		0
Level 1 \| Equipment notes \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	0		0
Level 2 \| Fair Value, Recurring
Financial assets:
Cash and cash equivalents	0		0
Short-term investments	0		0
Restricted cash	0		0
Derivative instrument	0		0
Level 2 \| Convertible Debt \| Convertible Notes due 2026 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments			0
Level 2 \| Convertible Debt \| Convertible Notes due 2030 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	0		0
Level 2 \| Notes Payable, Other Payables \| Samarium Project Loan \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	98,536		98,081
Level 2 \| Equipment notes \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	29,972		25,339
Level 3 \| Fair Value, Recurring
Financial assets:
Cash and cash equivalents	0		0
Short-term investments	0		0
Restricted cash	0		0
Derivative instrument	11,583	$ 12,806	8,708	$ 4,468	$ 6,997	$ 0
Level 3 \| Convertible Debt \| Convertible Notes due 2026 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments			0
Level 3 \| Convertible Debt \| Convertible Notes due 2030 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	0		0
Level 3 \| Notes Payable, Other Payables \| Samarium Project Loan \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	0		0
Level 3 \| Equipment notes \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	0		0
Carrying Amount \| Fair Value, Recurring
Financial assets:
Cash and cash equivalents	429,075		1,166,011
Short-term investments	1,023,564		664,275
Restricted cash	541		1,348
Derivative instrument	11,583		8,708
Carrying Amount \| Convertible Debt \| Convertible Notes due 2026 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments			67,411
Carrying Amount \| Convertible Debt \| Convertible Notes due 2030 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	847,267		845,301
Carrying Amount \| Notes Payable, Other Payables \| Samarium Project Loan \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	87,316		86,029
Carrying Amount \| Equipment notes \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	29,099		24,270
Fair Value \| Fair Value, Recurring
Financial assets:
Cash and cash equivalents	429,075		1,166,011
Short-term investments	1,023,564		664,275
Restricted cash	541		1,348
Derivative instrument	11,583		8,708
Fair Value \| Convertible Debt \| Convertible Notes due 2026 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments			82,449
Fair Value \| Convertible Debt \| Convertible Notes due 2030 \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	2,314,641		2,172,782
Fair Value \| Notes Payable, Other Payables \| Samarium Project Loan \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	98,536		98,081
Fair Value \| Equipment notes \| Fair Value, Nonrecurring
Financial liabilities:
Debt Instruments	$ 29,972		$ 25,339