| In millions, except per share items | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 8-K | 10-Q | 10-Q | 10-Q | 10-K |
| Net income | -35.4 | -14.3 | -18.4 | -76.4 | -19.1 | -20.2 | -8.5 | -6.5 |
| Depreciation and amortization | 0.6 | 0.5 | 0.4 | 1.1 | 0.3 | 0.3 | 0.2 | 0.3 |
| Stock-based compensation | 10.9 | 12.4 | 16.6 | | 0.6 | 0.5 | 0.6 | 0.8 |
| Change in working capital [+] | -2.3 | 6.0 | 5.0 | -9.1 | 2.1 | 1.3 | 0.8 | 0.1 |
| Other current assets | -3.1 | 5.5 | 0.7 | | 1.5 | -2.5 | 0.0 | -0.2 |
| Accounts payable | -1.0 | 0.4 | 1.6 | 2.0 | 1.1 | 1.4 | 0.3 | 0.2 |
| Accrued expenses | 1.8 | 0.0 | 2.6 | | -0.5 | 2.4 | 0.5 | 0.1 |
| Other | | | 0.1 | -11.0 | 0.0 | | | |
| Other operating activities | 0.2 | -26.6 | -21.8 | 20.4 | 3.4 | 4.8 | 0.1 | -1.5 |
| Cash from operations | -26.0 | -22.0 | -18.2 | -64.0 | -12.8 | -13.3 | -6.8 | -6.8 |
| |
| Capital expenditures [+] | -3.8 | -2.7 | -1.7 | -3.4 | -0.8 | -0.6 | -1.0 | -3.6 |
| Purchases of property and equipment | -3.8 | -2.7 | -1.7 | -3.4 | -0.8 | -0.6 | -1.0 | -3.6 |
| Sales of property and equipment | 0.4 | | | | | | | |
| Sales of short-term investments | | | | 53.2 | 13.0 | 17.0 | 18.2 | |
| Sales of short-term investments | | | | 53.2 | 13.0 | 17.0 | 18.2 | |
| Other cash from investing | | | | 413.6 | | -0.4 | | 8.1 |
| Cash from investing | -3.4 | -2.7 | -1.7 | 463.5 | 12.2 | 16.1 | 17.3 | 4.4 |
| |
| Option exercises | 0.2 | 0.8 | 0.4 | | 0.1 | 0.0 | 0.1 | |
| Other cash from financing | 0.2 | 1.4 | 0.7 | -146.0 | -0.7 | 24.9 | 0.1 | 0.0 |
| Cash from financing | 0.0 | 0.6 | 0.3 | -146.0 | -0.8 | 24.9 | 0.0 | 0.0 |
| |
| Free cash flow | -29.8 | -24.7 | -19.9 | -67.4 | -13.6 | -13.9 | -7.8 | -10.5 |
| Per share (diluted) | ($1.29) | ($0.05) | ($0.04) | ($1.30) | ($1.91) | ($0.10) | ($0.16) | ($0.08) |
| |
| Cash paid for interest | | | 0.0 | | 0.0 | 0.0 | 0.0 | |