| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 10-K | 10-K | 10-K |
| Net income | -95.0 | -36.6 | -35.8 |
| Depreciation and amortization | 1.0 | 0.9 | 0.8 |
| Stock-based compensation | 24.9 | 1.9 | 2.7 |
| Change in working capital [+] | 0.3 | 1.0 | 1.1 |
| Other current assets | -4.9 | 0.0 | 0.8 |
| Accounts payable | 0.7 | 0.5 | -0.3 |
| Accrued expenses | 4.5 | 0.4 | 0.6 |
| Other operating activities | 1.9 | 0.3 | 0.5 |
| Cash from operations | -66.8 | -32.6 | -30.7 |
| |
| Capital expenditures | -5.8 | -0.5 | -1.2 |
| Purchases of property and equipment | -5.8 | -0.5 | -1.2 |
| Acquisitions | -4.6 | | |
| Purchases of short-term investments | -440.5 | | |
| Purchases of short-term investments | -440.5 | | |
| Cash from investing | -450.9 | -0.5 | -1.2 |
| |
| Option exercises | 5.6 | 0.1 | 0.1 |
| Other cash from financing | 522.2 | 37.1 | 18.3 |
| Cash from financing | 516.6 | 37.0 | 18.2 |
| |
| Free cash flow | -72.6 | -33.0 | -31.9 |
| Per share (diluted) | ($0.91) | ($6.17) | ($6.21) |