| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-05-19 | Dec-31-18 | Dec-05-18 |
| | 10-K | 10-K | 10-K | 10-K | S-1/A | 10-K | S-1/A |
| Revenue | | | | | 13.4 | | 5.0 |
| Revenue growth | | | | | 167.2% | | |
| Operating expenses: | | | | | | | |
| Research and development | 93.7 | 112.9 | 43.3 | 13.4 | | 5.0 | |
| General and administrative | 43.4 | 38.5 | 14.8 | 3.4 | 3.4 | 1.6 | 1.6 |
| Total operating expenses | 137.1 | 151.4 | 58.0 | 16.8 | 16.8 | 6.6 | 6.6 |
| Loss from operations | -137.1 | -151.4 | -58.0 | -16.8 | -16.8 | -6.6 | -6.6 |
| |
| Other income (expense), net: | | | | | | | |
| Interest and other income, net | 3.9 | 0.3 | 0.9 | 0.7 | | | |
| Total other income (expense), net | 3.9 | 0.3 | -30.4 | 0.7 | | -0.1 | |
| Net loss | -133.2 | -151.1 | -88.4 | -16.1 | -16.1 | -6.7 | -6.7 |
| |
| Other comprehensive income (loss): | | | | | | | |
| Net unrealized gain (loss) on available-for-sale securities | -0.8 | 0.0 | | | | | |
| Net comprehensive loss | -134.0 | -151.1 | -88.4 | -16.1 | | -6.7 | |
| |
| Net loss per share, basic (in dollars per share) | ($2.37) | ($2.76) | ($5.43) | ($3.05) | ($3.05) | ($1.38) | ($1.38) |
| Net loss per share, diluted (in dollars per share) | ($2.37) | ($2.76) | ($5.43) | ($3.05) | ($3.05) | ($1.38) | ($1.38) |
| |
| Weighted-average shares of common stock, basic (in shares) | 56.2 | 54.8 | 16.3 | 5.3 | 5.3 | 4.9 | 4.9 |
| Weighted-average shares of common stock, diluted (in shares) | 56.2 | 54.8 | | | | | |