Common Shares (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 9 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Feb. 25, 2026 |
Nov. 21, 2025 |
Oct. 15, 2025 |
Sep. 29, 2025 |
Sep. 19, 2025 |
Aug. 18, 2025 |
Jul. 18, 2025 |
Nov. 13, 2024 |
Apr. 12, 2024 |
Apr. 12, 2024 |
Mar. 17, 2023 |
Sep. 30, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 04, 2026 |
Oct. 17, 2025 |
Jun. 30, 2025 |
|
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Common stock, shares issued | 17,400,000 | 10,152,175 | 7,004,740 | 10,000,000 | 13,850,000 | 2,755,218 | 145,327,493 | 5,924,942 | 58,491,196 | ||||||||
| Offering price of common shares issued in offering | $ 0 | $ 0 | |||||||||||||||
| Offering price of common shares issued in offering | $ 5 | $ 9.34 | $ 6.15 | $ 5 | $ 3.25 | ||||||||||||
| Net Proceeds | $ 93,406 | $ 139,147 | $ 55,320 | $ 45,925 | $ 41,186 | $ 466,010 | $ 14,516 | ||||||||||
| Common share description | On February 25, 2026, the Company issued and sold (a) 17,400,000 Common Shares at an offering price of $5.00 per Common Share and (b) 2,600,000 pre-funded Warrants (the “February Pre-Funded Warrants”) to purchase up to an additional 2,600,000 Common Shares at an offering price of $4.9999 per February Pre-Funded Warrant in a registered offering (the “February 2026 Offering”) under the Company's registration statement on Form S-3 (Registration No. 333-290837), pursuant to the Placement Agency Agreement between the Company and Maxim, dated February 24, 2026. On February 25, 2026 and March 4, 2026, the Company issued a total of 2,599,951 Common Shares in connection with the cashless exercise of all of the outstanding February Pre-Funded Warrants. The Company received net proceeds from the February 2026 Offering, after deducting placement agent fees and other offering expenses payable by the Company, of approximately $93,406. | On October 15, 2025, the Company issued and sold (a) 10,152,175 Common Shares at an offering price of $9.34 per Common Share and (b) 5,925,000 pre-funded Warrants (the “October Pre-Funded Warrants”) to purchase up to an additional 5,925,000 Common Shares at an offering price of $9.3399 per October Pre-Funded Warrant in a registered offering (the “October 2025 Offering”) under the Company's registration statement on Form S-3 (Registration No. 333-290837), pursuant to the Placement Agency Agreement between the Company and Maxim, dated October 13, 2025. On October 17, 2025, the Company issued 5,924,942 Common Shares in connection with the cashless exercise of all of the outstanding October Pre-Funded Warrants. The Company received net proceeds from the October 2025 Offering, after deducting placement agent fees and other offering expenses payable by the Company, of approximately $139,147. | On September 29, 2025, the Company issued and sold (a) 7,004,740 Common Shares at a public offering price of $6.15 per Common Share and (b) 2,755,260 pre-funded Warrants to purchase an aggregate of 2,755,260 Common Shares (the “September Pre-Funded Warrants”) at a public offering price of $6.1499 per September Pre-Funded Warrant in a confidentially marketed public offering (the “September 2025 Public Offering”) under the Company’s registration statement on Form S-3 (Registration No. 333-280176), pursuant to the Placement Agency Agreement between the Company and Maxim, dated September 26, 2025. On September 30, 2025, the Company issued 2,755,218 Common Shares in connection with the cashless exercise of all of the outstanding September Pre-Funded Warrants. The Company received net proceeds from the September 2025 Public Offering, after deducting placement agent fees and other offering expenses payable by the Company, of approximately $55,320. | ||||||||||||||
| Common stock shares | 5,925,000 | 2,755,260 | |||||||||||||||
| Number of share outstanding | 19,101,667 | ||||||||||||||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 2,282,500 | ||||||||||||||||
| Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 4.68 | ||||||||||||||||
| Share based compensation | $ 3,911 | $ 788 | |||||||||||||||
| Warrants outstanding | 19,101,667 | ||||||||||||||||
| Description of warrants | on November 13, 2024, the Company closed a non-brokered private placement of 2,199,602 units of the Company (the “November 2024 Units”). Each November 2024 Unit consisted of one Common Share, one Warrant (a “Series A Private Warrant”) to purchase one Common Share, and one-half of one Warrant (each whole such Warrant, a “Series B Private Warrant” and, together with the Series A Private Warrants, the “November 2024 Private Warrants”), with each Series B Private Warrant entitling the holder thereof to purchase one additional Common Share. The Series A Private Warrants have an exercise price of $1.75 per underlying Common Share, are exercisable immediately, and will expire on November 13, 2026. The Series B Private Warrants have an exercise price of $2.07 per underlying Common Share and will expire on November 13, 2029. Based upon the Company’s analysis of the criteria contained in ASC 815, the Company determined that the November 2024 Private Warrants met the definition of a derivative liability. | ||||||||||||||||
| Exchange of 2023 Private Warrants for 2023 Public Warrants | NioCorp Assumed Warrant Agreement, during the nine-month period ended March 31, 2026, a total of 2,281,881 2023 Private Warrants were exchanged for 2023 Public Warrants. Upon exchange, the Company recorded a non-cash loss of $1,217 in change in fair value of warrant liabilities in the condensed consolidated statement of operations, representing the change in fair value of the 2023 Private Warrants through the respective exercise dates. | ||||||||||||||||
| Number of Warrants Exchanged | 2,281,881 | ||||||||||||||||
| Non-cash loss | $ 1,217 | ||||||||||||||||
| Number of shares exercised | 450,000 | ||||||||||||||||
| Beneficial ownership percentage | 20.00% | ||||||||||||||||
| Shareholder rights plan expiration date | May 21, 2026 | ||||||||||||||||
| Yorkville Equity Facility Financing Agreement [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Expires date | Apr. 01, 2026 | ||||||||||||||||
| April 2024 Warrants [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Non-cash loss | $ 1,318 | ||||||||||||||||
| Private Placement [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Shares issue | 2,199,602 | ||||||||||||||||
| November Private Warrants [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Non-cash loss | $ 1,702 | ||||||||||||||||
| Purchase Agreement [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Number of shares exercised | 615,385 | ||||||||||||||||
| Warrant determination percentage | 25.00% | 25.00% | |||||||||||||||
| Warrant exercise price | $ 3.25 | $ 3.25 | |||||||||||||||
| Unsecured Debt [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Aggregate principal amount | $ 8,000 | ||||||||||||||||
| GXII Warrants [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Number of share outstanding | 9,999,959 | ||||||||||||||||
| Warrants outstanding | 9,999,959 | ||||||||||||||||
| G X I I Private Warrants [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Number of share outstanding | 5,666,667 | ||||||||||||||||
| Warrants outstanding | 5,666,667 | ||||||||||||||||
| Warrant [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Issuance of warrants | 2,600,000 | 5,925,000 | 2,755,260 | ||||||||||||||
| Offering price per share | $ 4.9999 | $ 9.3399 | $ 6.1499 | ||||||||||||||
| Number of share outstanding | 15,666,626 | 19,101,667 | 29,985,922 | ||||||||||||||
| Warrants outstanding | 15,666,626 | 19,101,667 | 29,985,922 | ||||||||||||||
| Description of warrants | Each 2023 Private Warrant entitles the holder to the right to purchase 1.11829212 Common Shares at an exercise price of $11.50 per 1.11829212 Common Shares (subject to adjustments for stock splits, stock dividends, reorganizations, recapitalizations and the like). | ||||||||||||||||
| Warrant exercise price | $ 9.78 | $ 7.06 | |||||||||||||||
| February 2026 Pre-Funded Warrants [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Common stock, shares issued | 2,599,951 | 2,599,951 | |||||||||||||||
| Pre-Funded Warrants [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Number of share outstanding | 2,600,000 | ||||||||||||||||
| Warrants outstanding | 2,600,000 | ||||||||||||||||
| Equity Option [Member] | |||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | |||||||||||||||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross | 2,282,500 | ||||||||||||||||
| Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 4.68 | ||||||||||||||||
| Average grant-date fair value | $ 2.84 | ||||||||||||||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | 3.84% | ||||||||||||||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 76.80% | ||||||||||||||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected warrant life in years | 4 years 6 months 21 days | ||||||||||||||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares | 250,000 | ||||||||||||||||