| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | -19.2 | -20.9 | -21.1 | -21.7 | -22.9 | -25.5 | -25.9 | -35.1 |
| Depreciation and amortization [+] | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 |
| Depreciation | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 |
| Stock-based compensation | 2.6 | 2.7 | 2.9 | 2.7 | 3.3 | 3.4 | 3.4 | 3.0 |
| Change in working capital [+] | 2.1 | -2.0 | -3.9 | 2.3 | 1.4 | -6.8 | -2.1 | 4.8 |
| Other current assets | 1.1 | 0.4 | 1.9 | 0.9 | 0.9 | -2.6 | 0.5 | 0.8 |
| Accounts payable | -0.3 | 1.2 | -3.9 | 3.5 | 0.3 | -2.2 | -0.7 | 0.6 |
| Accrued expenses | 1.4 | -3.6 | -1.9 | -2.1 | 0.1 | -2.0 | -2.0 | 3.3 |
| Other operating activities | 0.0 | 0.1 | 0.0 | 0.1 | 0.1 | 0.2 | 0.5 | 0.8 |
| Cash from operations | -14.4 | -20.0 | -21.9 | -16.5 | -18.1 | -28.6 | -24.0 | -26.5 |
| |
| Capital expenditures [+] | 0.0 | 0.0 | 0.0 | 0.0 | -0.2 | 0.0 | -0.3 | -1.5 |
| Purchases of property and equipment | | | | 0.0 | -0.2 | 0.0 | -0.3 | -1.5 |
| Sales of property and equipment | 0.1 | | | | | | | |
| Sales of short-term investments | 17.1 | 24.8 | 26.0 | 30.4 | 20.0 | 37.2 | 48.5 | 39.2 |
| Sales of short-term investments | 17.1 | 24.8 | 26.0 | 30.4 | 20.0 | 37.2 | 48.5 | 39.2 |
| Other cash from investing | | | -23.7 | -16.0 | | -20.5 | -4.9 | -2.0 |
| Cash from investing | 17.2 | 24.8 | 2.3 | 14.5 | 19.8 | 16.7 | 43.2 | 35.7 |
| |
| Option exercises | | 0.1 | 0.0 | 0.1 | | 0.2 | | 0.1 |
| Other cash from financing | | 0.1 | -0.1 | 0.1 | | 0.3 | | 0.1 |
| Cash from financing | 0.0 | 0.1 | 0.0 | 0.1 | 0.0 | 0.2 | 0.0 | 0.1 |
| |
| Free cash flow | -14.4 | -20.0 | -21.9 | -16.5 | -18.3 | -28.6 | -24.4 | -28.0 |
| Per share (diluted) | ($0.39) | ($0.55) | ($0.60) | ($0.45) | ($0.50) | ($0.79) | ($0.67) | ($0.77) |