| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 |
| | 8-K | 10-K | 10-K | 10-K | S-1/A |
| ASSETS | | | | | |
| Current assets: | | | | | |
| Cash and cash equivalents | | | | | |
| Marketable securities | | 0.5 | | | |
| Other receivables | 3.6 | 0.1 | 0.0 | 0.0 | |
| Prepaid expenses | 4.8 | | | 0.0 | |
| Total current assets | 225.4 | 176.0 | 170.7 | 58.0 | |
| Property and equipment, net | 1.0 | 0.8 | 0.5 | 0.2 | |
| Operating lease right-of-use assets | | 1.1 | 0.7 | | |
| Other assets | 0.6 | 1.1 | 0.1 | 0.0 | |
| Total assets | 227.9 | 178.9 | 172.0 | 58.3 | |
| |
| LIABILITIES AND STOCKHOLDERS' EQUITY | | | | | |
| Current liabilities: | | | | | |
| Accounts payable and other accrued liabilities | | 8.7 | 4.3 | 0.5 | |
| Accrued payroll and benefits | 5.5 | 2.8 | 1.0 | 0.3 | |
| Total current liabilities | 15.4 | 11.5 | 5.4 | 0.8 | |
| Other long-term liabilities | 0.1 | 0.7 | 0.6 | 0.1 | |
| Total liabilities | 35.0 | 12.2 | 6.0 | 0.9 | |
| |
| Commitments and contingencies (Note 8) | | | | | |
| Stockholders’ equity: | | | | | |
| Common stock | 0.0 | 0.0 | 0.0 | 0.0 | |
| Additional paid-in capital | 301.7 | 213.4 | 198.8 | 0.0 | |
| Accumulated other comprehensive loss | -0.1 | | | | |
| Accumulated deficit | -108.8 | -46.7 | -32.8 | -6.0 | |
| Total stockholders’ equity | 192.9 | 166.7 | 166.0 | -6.0 | |
| Total liabilities and stockholders’ equity | 227.9 | 178.9 | 172.0 | 58.3 | |