RELATED PARTY TRANSACTIONS - Additional Information (Details) - USD ($) |
1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 03, 2025 |
Aug. 06, 2025 |
Mar. 31, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Mar. 28, 2025 |
|
| RELATED PARTY TRANSACTIONS | |||||||||||||
| General and administrative | $ 6,362,000 | $ 1,739,000 | $ 11,840,000 | $ 3,879,000 | $ 13,372,000 | $ 8,607,000 | |||||||
| Settlement of related party loans | $ 1,408,000 | ||||||||||||
| Spring Valley Acquisition III | |||||||||||||
| RELATED PARTY TRANSACTIONS | |||||||||||||
| General and administrative | 388,314 | 16,620 | $ 16,620 | 570,497 | $ 450,346 | ||||||||
| Spring Valley Acquisition III | Sponsor | Unsecured promissory note | |||||||||||||
| RELATED PARTY TRANSACTIONS | |||||||||||||
| Aggregate principal amount | $ 151,636 | 151,636 | $ 151,636 | 151,636 | $ 151,636 | $ 250,000 | |||||||
| Outstanding borrowing paid | $ 151,636 | ||||||||||||
| Spring Valley Acquisition III | Administrative Services Agreement | Sponsor | |||||||||||||
| RELATED PARTY TRANSACTIONS | |||||||||||||
| General and administrative | $ 120,000 | $ 90,000 | $ 180,000 | $ 120,000 | |||||||||
| Monthly expenses | $ 30,000 | ||||||||||||
| Spring Valley Acquisition III | Related Party Loans | |||||||||||||
| RELATED PARTY TRANSACTIONS | |||||||||||||
| Exercise price | $ 0.09 | $ 0.09 | $ 0.09 | ||||||||||
| Loans outstanding | $ 0 | $ 0 | $ 0 | ||||||||||
| Spring Valley Acquisition III | Related Party Loans | Maximum | |||||||||||||
| RELATED PARTY TRANSACTIONS | |||||||||||||
| Settlement of related party loans | $ 1,500,000,000,000 | $ 1,500,000 | |||||||||||