| 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 |
| Net income | -133.2 | -151.1 | -88.4 | -16.1 | -16.1 | -6.7 | -6.7 |
| Depreciation and amortization | 2.3 | 2.0 | 0.8 | 0.4 | 0.4 | 0.1 | 0.1 |
| Stock-based compensation | 31.1 | 26.2 | 3.8 | 0.1 | 0.1 | 0.0 | 0.0 |
| Change in working capital [+] | 52.6 | 37.2 | 20.6 | 4.6 | 0.7 | 2.1 | 0.4 |
| Other current assets | 1.6 | -1.0 | -5.2 | -0.6 | | 0.0 | |
| Accounts payable | 4.0 | -3.2 | 2.8 | 0.7 | 0.7 | 0.0 | 0.0 |
| Accrued expenses | 4.1 | 4.8 | 3.2 | 0.6 | | 0.2 | |
| Other | 42.8 | 36.5 | 19.8 | 3.9 | 0.0 | 1.9 | 0.4 |
| Other operating activities | -43.7 | -32.2 | 25.4 | -4.1 | -0.1 | -1.9 | -0.2 |
| Cash from operations | -90.9 | -117.9 | -37.9 | -15.1 | -15.1 | -6.4 | -6.4 |
| |
| Capital expenditures | -0.6 | -4.3 | -9.6 | -2.9 | -2.9 | -1.1 | -1.1 |
| Purchases of property and equipment | -0.6 | -4.3 | -9.6 | -2.9 | -2.9 | -1.1 | -1.1 |
| Purchases of short-term investments, net | -31.6 | 68.0 | -150.7 | -64.6 | -64.6 | | |
| Purchases of short-term investments | -367.1 | -177.7 | -229.3 | -64.6 | -64.6 | | |
| Sales of short-term investments | 335.5 | 245.7 | 78.7 | | | | |
| Cash from investing | -32.2 | 63.7 | -160.2 | -67.6 | -67.6 | -1.1 | -1.1 |
| |
| Issuance of common stock, net | 0.5 | 3.1 | 264.4 | 0.1 | 0.1 | 0.0 | 0.0 |
| Option exercises | 0.4 | 1.3 | | | | | |
| Other cash from financing | 0.8 | 2.7 | 151.2 | 104.9 | 104.9 | 16.2 | 16.2 |
| Cash from financing | 0.9 | 4.5 | 415.6 | 105.0 | 105.0 | 16.2 | 16.2 |
| |
| Free cash flow | -91.5 | -122.2 | -47.5 | -18.0 | -18.0 | -7.5 | -7.5 |
| Per share (diluted) | ($1.63) | ($2.23) | ($2.92) | ($3.42) | ($3.42) | ($1.55) | ($1.55) |