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CONVERTIBLE SENIOR NOTES - Narrative (Details)				3 Months Ended		9 Months Ended		12 Months Ended
	Nov. 21, 2024 USD ($) d $ / shares shares	Jun. 30, 2023 USD ($) $ / shares	Feb. 16, 2021 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($)	Nov. 07, 2024 USD ($)
Debt Instrument [Line Items]
Lock-up period restriction (in months)	6 months
Gain on debt restructuring								$ 154,400,000
Restructuring of debt (in dollar per share) | $ / shares								$ 0.56
Convertible senior notes, net, non-current				$ 645,159,000		$ 645,159,000		$ 647,494,000
Accrued expenses				29,172,000		29,172,000		22,595,000
2028 Convertible Senior Notes
Debt Instrument [Line Items]
Debt issuance costs		$ 1,500,000
Amortization of debt issuance costs				0	$ 81,000	0	$ 243,000
2028 Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 459,000,000
Debt instrument, stated interest rate	1.50%		1.50%
Principal amount of notes		441,000,000	$ 900,000,000
Payments made in conjunction with convertible notes exchange	$ 50,000,000
Threshold percentage of stock price trigger	9.90%
Debt issuance costs			$ 4,500,000
Aggregate outstanding balance	$ 0	459,000,000						0		$ 459,000,000
Fair value of convertible debt				169,400,000		169,400,000
Debt instrument, effective interest rate			1.60%
Amortization of debt issuance costs			$ 1,100,000
2029 Convertible Senior Notes
Debt Instrument [Line Items]
Debt issuance costs	3,100,000
Debt issuance cost, lender fees	$ 200,000
Convertible notes payable				212,000,000		212,000,000		214,200,000
Convertible senior notes, net, non-current				209,000,000.0		209,000,000.0
Accrued expenses				3,000,000.0		3,000,000.0
2029 Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, stated interest rate	1.50%
Principal amount of notes	$ 200,000,000									$ 200,000,000
Debt conversion, shares issued (in shares) | shares	20,451,570
Threshold percentage of stock price trigger	150.00%
Debt instrument, convertible, conversion ratio	0.20451570
Conversion price per share (in dollars per share) | $ / shares	$ 4.89
Threshold trading days | d	20
Threshold consecutive trading days | d	30
Redemption price, percentage	100.00%
Debt instrument, debt default, calendar days	360 days
2029 Convertible Senior Notes | Convertible Debt | Debt Conversion Terms One
Debt Instrument [Line Items]
Debt instrument, debt default, calendar days	180 days
Debt instrument, interest in the event of default (as a percent)	0.25%
2029 Convertible Senior Notes | Convertible Debt | Debt Conversion Terms Two
Debt Instrument [Line Items]
Debt instrument, debt default, calendar days	361 days
Additional interest in the event of default (as a percent)	0.50%
2029 Convertible Senior Notes | Convertible Debt | Debt Conversion Terms Two | Minimum
Debt Instrument [Line Items]
Debt instrument, debt default, calendar days	181 days
2029 Convertible Senior Notes | Convertible Debt | Debt Conversion Terms Two | Maximum
Debt Instrument [Line Items]
Debt instrument, debt default, calendar days	360 days
Exchange Transaction
Debt Instrument [Line Items]
Loss on extinguishment of debt									$ 2,000,000
Exchange Transaction | Convertible Debt
Debt Instrument [Line Items]
Paid accrued but unpaid interest	$ 1,800,000	2,500,000
2030 Convertible Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross				441,000,000		441,000,000		441,000,000
Debt issuance costs		$ 7,300,000
Aggregate outstanding balance				436,159,000		436,159,000		$ 435,494,000
Amortization of debt issuance costs				241,000	$ 237,000	720,000	$ 712,000
2030 Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Debt instrument, stated interest rate		1.375%
Principal amount of notes		$ 441,000,000
Debt instrument, convertible, conversion ratio		0.0465116
Conversion price per share (in dollars per share) | $ / shares		$ 21.50
Redemption price, percentage		100.00%
Debt instrument, debt default, calendar days		360 days
Debt instrument, interest in the event of default (as a percent)		0.25%
Additional interest in the event of default (as a percent)		0.50%
Fair value of convertible debt				$ 314,500,000		$ 314,500,000
Debt redemption, percentage of conversion price		150.00%
Debt redemption, trading days		20 days
Debt redemption, consecutive trading days		30 days
Debt instrument, effective interest rate		1.60%
2030 Convertible Senior Notes | Convertible Debt | Minimum
Debt Instrument [Line Items]
Debt instrument, debt default, calendar days		181 days
2030 Convertible Senior Notes | Convertible Debt | Maximum
Debt Instrument [Line Items]
Debt instrument, debt default, calendar days		360 days
2030 Convertible Senior Notes | Convertible Debt | Debt Conversion Terms One
Debt Instrument [Line Items]
Debt instrument, debt default, calendar days		180 days
2030 Convertible Senior Notes | Convertible Debt | Debt Conversion Terms Two
Debt Instrument [Line Items]
Debt instrument, debt default, calendar days		361 days

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