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Stockholders' equity (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2026 USD ($) $ / shares shares | Jan. 28, 2026 USD ($) $ / shares shares | Dec. 08, 2025 USD ($) $ / shares shares | Apr. 30, 2025 shares | Jun. 30, 2026 USD ($) $ / shares shares | Jun. 30, 2025 USD ($) shares | Jun. 30, 2026 USD ($) Vote $ / shares shares | Jun. 30, 2025 USD ($) shares | Dec. 31, 2025 USD ($) $ / shares shares | Mar. 31, 2026 USD ($) shares | Mar. 31, 2025 shares | Dec. 31, 2024 shares | Nov. 08, 2024 USD ($)
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |
Stock, shares authorized |  |  |  |  | 440,000,000 |  | 440,000,000 |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  | 400,000,000 |  | 400,000,000 |  | 400,000,000 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 40,000,000 |  | 40,000,000 |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |  |
Number of voting rights per common share | Vote |  |  |  |  |  |  | 1 |  |  |  |  |  |
Stock based compensation expense | $ |  |  |  |  | $ 100,000 | $ 100,000 | $ 200,000 | $ 300,000 |  |  |  |  |
Shelf Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ |  |  |  |  |  |  | 35,598,881 | 459,019 |  |  |  |  |
Common stock issuance costs | $ |  |  |  |  |  |  | 2,912,439 | 18,291 |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issuance costs | $ |  |  |  |  |  |  | 2,912,439 | $ 18,291 |  |  |  |  |
Warrant exercises | $ |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |
December 2025 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares |  |  |  |  | $ 1.04 |  | $ 1.04 |  |  |  |  |  |
January 2026 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares |  |  |  |  | 0.765 |  | 0.765 |  |  |  |  |  |
March 2026 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares |  |  |  |  | $ 0.683 |  | $ 0.683 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred stock into common stock (in shares) |  |  |  | 12,516 |  |  |  |  |  |  |  |  |
Series A Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible preferred stock, shares outstanding |  |  |  |  | 31,194 | 31,194 | 31,194 | 31,194 | 31,194 | 31,194 | 56,227 | 56,227 |
Number of shares remained to be converted into common stock |  |  |  |  | 15,596 |  | 15,596 |  | 15,596 |  |  |  |
Conversion of preferred stock into common stock (in shares) |  |  |  | 25,033 |  | 25,033 |  |  |  |  |  |  |
Private Placement | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of shares |  |  |  |  | 41,099,626 |  | 41,099,626 |  |  |  |  |  |
March 2024 Private Placement | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercises | $ |  |  |  |  |  |  |  |  | $ 91 |  |  |  |
Class of warrant or right, number of warrants exercised |  |  |  |  |  |  |  |  | 91,206 |  |  |  |
December 2025 Private Placement | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercises | $ |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |
Class of warrant or right, number of warrants exercised |  |  |  |  |  |  | 1,376,405 |  | 1,198,700 |  |  |  |
December 2025 Private Placement | Purchasers | Securities purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Shelf Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  | 26,459 |  |  |  |  |  |  |  |  |  |
Common stock issuance costs | $ |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 26,459 |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  |  | $ 1.165 |  |  |  |  |  |  |  |  |  |
Stock issuance anniversary period |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock in a private placement | $ |  |  | $ 3,100,000 |  |  |  |  |  |  |  |  |  |
Common stock issuance costs | $ |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
December 2025 Private Placement | Purchasers | Securities purchase agreement | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  |  | $ 1.164 |  |  |  |  |  |  |  |  |  |
Warrants to purchase of shares |  |  | 2,596,564 |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |
December 2025 Private Placement | Purchasers | Securities purchase agreement | December 2025 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of shares |  |  | 2,880,533 |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares |  |  | $ 1.04 |  |  |  |  |  |  |  |  |  |
December 2025 Private Placement | Placement Agent | Securities purchase agreement | December 2025 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of shares |  |  | 257,510 |  |  |  |  |  |  |  |  |  |
January 2026 Private Placement | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercises | $ |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
Class of warrant or right, number of warrants exercised |  |  |  |  | 400,000 |  | 923,596 |  |  |  |  |  |
January 2026 Private Placement | Purchasers | Securities purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Shelf Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  | 1,877,677 |  |  |  |  |  |  |  |  |  |  |
Common stock issuance costs | $ |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 1,877,677 |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  | $ 0.8891 |  |  |  |  |  |  |  |  |  |  |
Common stock issuance costs | $ |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Issuance of gross proceeds | $ |  | $ 5,600,000 |  |  |  |  |  |  |  |  |  |  |
January 2026 Private Placement | Purchasers | Securities purchase agreement | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares |  | $ 0.8881 |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of shares |  | 4,411,180 |  |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
January 2026 Private Placement | Purchasers | Securities purchase agreement | January 2026 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of shares |  | 6,288,857 |  |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares |  | $ 0.765 |  |  |  |  |  |  |  |  |  |  |
Stock issuance anniversary period |  | 2 years |  |  |  |  |  |  |  |  |  |  |
March 2026 Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Subscription receivable | $ |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
March 2026 Private Placement | Purchasers | Securities purchase agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Shelf Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issuance costs | $ | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issuance costs | $ | 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of gross proceeds | $ | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |
March 2026 Private Placement | Purchasers | Securities purchase agreement | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Offering price per share | $ / shares | $ 0.807 |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of shares | 37,174,713 |  |  |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |
March 2026 Private Placement | Purchasers | Securities purchase agreement | March 2026 Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase of shares | 37,174,713 |  |  |  |  |  |  |  |  |  |  |  |
Common stock with an exercise price | $ / shares | $ 0.683 |  |  |  |  |  |  |  |  |  |  |  |
2024 Shelf Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Shelf Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount to be issued under at-the-market offering program, supplement | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
2024 Shelf Registration Statement | HCW |  |  |  |  |  |  |  |  |  |  |  |  |
Shelf Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount to be issued under at-the-market offering program | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000
2024 ATM offering |  |  |  |  |  |  |  |  |  |  |  |  |
Shelf Registration Statement |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued |  |  |  |  |  |  |  |  | 1,337,948 |  |  |  |
Proceeds from issuance of common stock | $ |  |  |  |  |  |  |  |  | $ 1,900,000 |  |  |  |
Common stock issuance costs | $ |  |  |  |  |  |  |  |  | $ 76,000 |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  | 1,337,948 |  |  |  |
Common stock issuance costs | $ |  |  |  |  |  |  |  |  | $ 76,000 |  |  |  |

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