| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 10-K | 10-K | 10-K | S-1/A |
| Net income | -104.2 | -86.8 | -41.7 | -33.6 |
| Depreciation and amortization | 0.2 | 0.2 | 0.1 | 0.0 |
| Stock-based compensation | 16.3 | 9.3 | 2.2 | |
| Change in working capital [+] | -3.7 | 9.6 | 2.1 | 11.5 |
| Other current assets | | | -0.7 | |
| Accounts payable | -1.8 | 1.9 | 0.0 | 1.9 |
| Accrued expenses | -2.3 | 7.5 | 2.9 | 0.9 |
| Other | 0.4 | 0.3 | -0.1 | 8.6 |
| Other operating activities | -4.7 | -0.4 | 0.7 | -2.4 |
| Cash from operations | -96.1 | -68.2 | -36.5 | -24.4 |
| |
| Capital expenditures [+] | -0.4 | -0.3 | -0.1 | -0.7 |
| Purchases of property and equipment | -0.4 | -0.3 | -0.1 | -0.7 |
| Sales of property and equipment | 0.0 | | | |
| Purchases of short-term investments, net | 63.8 | -454.4 | -72.7 | -112.7 |
| Purchases of short-term investments | -520.3 | -609.3 | -143.3 | -136.2 |
| Sales of short-term investments | 584.1 | 154.9 | 70.6 | 23.5 |
| Other cash from investing | | | 2.5 | -2.5 |
| Cash from investing | 63.5 | -454.7 | -70.3 | -115.9 |
| |
| Issuance of common stock, net | | | | 5.0 |
| Option exercises | 0.9 | 0.5 | | |
| Financing costs | | | -2.5 | |
| Other cash from financing | 2.3 | 626.0 | 130.6 | 138.6 |
| Cash from financing | 1.3 | 625.5 | 133.1 | 143.6 |
| |
| Free cash flow | -96.5 | -68.5 | -36.7 | -25.1 |
| Per share (diluted) | ($0.45) | ($0.35) | ($0.38) | ($121.40) |