| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Net income | -91.2 | -125.6 | -67.3 | -35.3 | -8.9 | 0.0 |
| Depreciation and amortization [+] | 0.5 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 |
| Depreciation | 0.5 | 0.2 | 0.1 | 0.0 | 0.0 | 0.0 |
| Stock-based compensation | 12.2 | 14.0 | 7.8 | 3.6 | 0.1 | 0.0 |
| Change in working capital [+] | -7.1 | 8.7 | 5.7 | 0.5 | 0.4 | -0.2 |
| Other current assets | 1.0 | -1.6 | -3.4 | -1.0 | 0.0 | |
| Accounts payable | -2.2 | 1.6 | 1.1 | 1.5 | 0.3 | -0.1 |
| Accrued expenses | -5.9 | 8.7 | 8.0 | 1.8 | 0.3 | |
| Other | | | | -1.7 | -0.2 | -0.1 |
| Other operating activities | 0.5 | 2.6 | 1.6 | 6.4 | 0.0 | -2.2 |
| Cash from operations | -85.1 | -100.1 | -52.1 | -24.7 | -8.5 | -2.4 |
| |
| Capital expenditures [+] | -0.2 | -2.7 | -0.1 | 0.0 | -0.1 | -0.1 |
| Purchases of property and equipment | -0.2 | -2.7 | -0.1 | 0.0 | -0.1 | -0.1 |
| Sales of property and equipment | 0.0 | | | | | |
| Sales of short-term investments | 113.7 | 182.8 | 90.9 | | | |
| Sales of short-term investments | 113.7 | 182.8 | 90.9 | | | |
| Other cash from investing | -60.1 | -49.5 | -372.5 | | | |
| Cash from investing | 53.4 | 130.6 | -281.7 | 0.0 | -0.1 | -0.1 |
| |
| Issuance of common stock, net | | | 213.8 | | | 0.1 |
| Option exercises | 0.2 | 0.7 | 1.1 | | | |
| Financing costs | | | | -1.7 | | |
| Other cash from financing | 0.4 | 1.5 | 2.2 | 126.0 | 52.3 | 9.9 |
| Cash from financing | 0.2 | 0.7 | 214.9 | 127.8 | 52.3 | 10.0 |
| |
| Free cash flow | -85.3 | -102.9 | -52.3 | -24.7 | -8.5 | -2.4 |
| Per share (diluted) | ($2.35) | ($2.84) | ($1.59) | ($11.90) | ($4.23) | ($1,261.89) |