| In millions, except per share items | Dec-31-22 | Dec-31-21 |
| | 10-K | 10-K |
| Assets | | |
| Current assets: | | |
| Cash and cash equivalents | 279.4 | 124.6 |
| Prepaid expenses and other current assets | 11.2 | 0.1 |
| Total current assets | 290.6 | 124.7 |
| Property and equipment, net | 5.6 | 0.0 |
| Operating lease right-of-use assets | 19.4 | 0.2 |
| Restricted cash | 1.6 | |
| Other assets | 0.0 | 2.2 |
| Total assets | 317.2 | 127.2 |
| |
| Liabilities and Stockholders' Equity | | |
| Current liabilities: | | |
| Accounts payable (includes related party amounts of $0 and $141, respectively) | 4.7 | 1.0 |
| Accrued expenses (includes related party amounts of $12 and $140, respectively) | 8.2 | 9.2 |
| Accrued interest | 0.1 | 2.8 |
| Current portion of operating lease liability | 0.0 | 0.0 |
| Total current liabilities | 13.0 | 227.8 |
| Operating lease liability, net of current portion | 21.6 | 0.2 |
| Long-term debt, net of debt discount | 14.8 | |
| Other long-term liabilities | 0.6 | 0.0 |
| Total liabilities | 50.0 | 227.9 |
| |
| Commitments and contingencies (Note 8) | | |
| Stockholders' equity: | | |
| Preferred stock, $0.0001 par value; authorized shares-50,000,000 at June 30, 2023 and December 31, 2022; no shares issued and outstanding at June 30, 2023 and December 31, 2022 | | |
| Common stock, $0.0001 par value; authorized shares | 0.0 | 0.0 |
| Additional paid-in capital | 532.5 | 4.4 |
| Accumulated other comprehensive loss | -0.3 | |
| Accumulated deficit | -265.0 | -105.2 |
| Total stockholders' equity | 267.2 | -100.8 |
| Total liabilities and stockholders' equity | 317.2 | 127.2 |