DEBT OBLIGATIONS - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Principal Amount | $ 1,012,793 | $ 1,080,292 |
| Unamortized Debt Discount and Issuance Costs | (78,210) | (81,551) |
| Carrying Amount | 934,583 | 998,741 |
| Long-Term Debt, Current Maturities | 0 | (67,411) |
| Long-term debt, net of current portion | 934,583 | 931,330 |
| Convertible Notes due 2026 | Convertible Debt | ||
| Debt Instrument [Line Items] | ||
| Principal Amount | 0 | 67,499 |
| Unamortized Debt Discount and Issuance Costs | 0 | (88) |
| Carrying Amount | 0 | 67,411 |
| Convertible Notes due 2030 | Convertible Debt | ||
| Debt Instrument [Line Items] | ||
| Principal Amount | 862,793 | 862,793 |
| Unamortized Debt Discount and Issuance Costs | (15,526) | (17,492) |
| Carrying Amount | 847,267 | 845,301 |
| Samarium Project Loan | Notes Payable, Other Payables | ||
| Debt Instrument [Line Items] | ||
| Principal Amount | 150,000 | 150,000 |
| Unamortized Debt Discount and Issuance Costs | (62,684) | (63,971) |
| Carrying Amount | $ 87,316 | $ 86,029 |
| X | ||||||||||
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of unamortized debt discount (premium) and debt issuance costs. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|