| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 8-K | 10-K | 10-K | 10-K |
| Net income | 102.0 | -90.1 | -49.5 | -57.4 |
| Depreciation and amortization [+] | | 0.1 | 0.1 | 0.0 |
| Depreciation | | 0.1 | 0.1 | 0.0 |
| Stock-based compensation | | 8.7 | 3.8 | 0.4 |
| Deferred taxes | | -0.2 | -0.1 | 0.0 |
| Change in working capital [+] | | -16.9 | -13.0 | -5.5 |
| Other current assets | | -5.7 | -3.6 | -1.9 |
| Accounts payable | | 4.8 | 1.1 | -0.5 |
| Accrued expenses | | 4.1 | 1.4 | 3.4 |
| Other | | -20.1 | -11.9 | -6.5 |
| Other operating activities | | 21.6 | 12.4 | 37.0 |
| Cash from operations | | -76.8 | -46.2 | -25.5 |
| |
| Capital expenditures | | -0.1 | -0.1 | -0.1 |
| Purchases of property and equipment | | -0.1 | -0.1 | -0.1 |
| Purchases of short-term investments, net | | 7.2 | -106.7 | |
| Purchases of short-term investments | | -141.2 | -118.9 | |
| Sales of short-term investments | | 148.4 | 12.2 | |
| Cash from investing | | 7.2 | -106.8 | -0.1 |
| |
| Issuance of common stock, net | | | | 87.7 |
| Option exercises | | 0.5 | 0.3 | |
| Financing costs | | | -0.2 | |
| Other cash from financing | | 24.4 | 158.0 | 20.0 |
| Cash from financing | | 23.9 | 157.9 | 107.7 |
| |
| Free cash flow | | -76.8 | -46.4 | -25.6 |
| Per share (diluted) | | ($3.82) | ($2.88) | ($10.92) |
| |
| Cash paid for interest | | 0.0 | | |
| Cash paid for income taxes | | | 0.1 | 0.1 |