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Common Stock - January 2024 Financing (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 117 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 08, 2024 USD ($) $ / shares shares | Jan. 04, 2024 USD ($) tranche $ / shares | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) shares | Dec. 31, 2024 shares | Mar. 04, 2024 USD ($) shares | Mar. 03, 2024 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  |  |  |  |  |  | $ 496,300 |  |  |
Reclassification of future tranche right liability upon settlement |  |  |  |  |  |  |  |  | $ 4,800 |
Common stock, shares authorized (in shares) | shares | 130,000,000 |  | 500,000,000 |  | 500,000,000 |  | 500,000,000 | 500,000,000 | 500,000,000 |
Change in fair value of the tranche rights |  |  | $ 0 | $ 0 | $ 0 | $ 4,796 |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Change in fair value of the tranche rights |  |  |  |  |  | 4,000 |  |  |  |
Other Nonoperating Income (Expense) |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Change in fair value of the tranche rights |  |  |  |  |  | $ 1,700 |  |  |  |
Private Placement | Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Private placement, number of tranche | tranche |  | 3 |  |  |  |  |  |  |  |
Sale of stock, price per share (in usd per share) | $ / shares |  | $ 0.0001 |  |  |  |  |  |  |  |
Private Placement | Common Stock | Tranche 1 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ 80,000 |  |  |  |  |  |  |  |  |
Private Placement | Common Stock | Tranche 2 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  | $ 80,000 |  |  |  |  |  |  |  |
Private Placement | Common Stock | Tranche 3 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  | $ 80,000 |  |  |  |  |  |  |  |
Private Placement | Shares reserved for the January 2024 Pre-funded stock warrants |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in usd per share) | $ / shares |  | $ 0.0001 |  |  |  |  |  |  |  |
Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Reclassification of future tranche right liability upon settlement | 23,600 |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares |  |  |  |  |  |  |  |  | 500,000,000 | 130,000,000
Common Stock and Pre-funded Warrants | Common Stock and Pre-funded Warrants |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Tranche rights as a liability, remainder amount | 80,000 |  |  |  |  |  |  |  |  |
Tranche rights as a liability, received amount | $ 56,400 |  |  |  |  |  |  |  |  |
Accredited Investors | Private Placement |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement |  | $ 240,000 |  |  |  |  |  |  |  |
Accredited Investors | Private Placement | Common Stock | Tranche 1 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in usd per share) | $ / shares | $ 1.43 |  |  |  |  |  |  |  |  |
Consideration received on transaction | $ 80,000 |  |  |  |  |  |  |  |  |
Number of shares registered for resale (in shares) | shares | 55,944,850 |  |  |  |  |  |  |  |  |
Accredited Investors | Private Placement | Common Stock | Tranche 2 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in usd per share) | $ / shares |  | $ 1.716 |  |  |  |  |  |  |  |
Consideration received on transaction |  | $ 80,000 |  |  |  |  |  |  |  |
Sale of stock, consideration received (as a percent) |  | 120.00% |  |  |  |  |  |  |  |
Number of tranche subjected to condition | tranche |  | 3 |  |  |  |  |  |  |  |
Threshold trading days for weighted average price calculation (in days) |  | 10 days |  |  |  |  |  |  |  |
Weighted average price (in usd per share) | $ / shares |  | $ 8.00 |  |  |  |  |  |  |  |
Threshold trading days for aggregate trading volume calculation (in days) |  | 10 days |  |  |  |  |  |  |  |
Aggregate trading volume of last 10 days |  | $ 100,000 |  |  |  |  |  |  |  |
Accredited Investors | Private Placement | Common Stock | Tranche 3 |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration received on transaction |  | $ 80,000 |  |  |  |  |  |  |  |
Third tranche close period after second tranche (in years) |  | 3 years |  |  |  |  |  |  |  |

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