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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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