| In millions, except per share items | Jun-30-23 | Mar-31-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Net income | -9.4 | -10.2 | -13.4 | -10.5 | -12.4 | -9.4 | -9.7 | -9.8 |
| Depreciation and amortization | 0.1 | 0.2 | 0.2 | 0.1 | 0.2 | 0.3 | 0.1 | 0.1 |
| Stock-based compensation | | | | | | -4.8 | | |
| Change in working capital [+] | -1.4 | -2.9 | 4.9 | -3.1 | -0.6 | 0.5 | 2.9 | 1.6 |
| Other current assets | | | | | | 0.1 | | |
| Other | -1.4 | -2.9 | 4.9 | -3.1 | -0.6 | 0.4 | 2.9 | 1.6 |
| Other operating activities | 1.2 | 1.2 | 1.6 | 1.6 | 2.1 | 5.5 | 1.1 | 2.0 |
| Cash from operations | -9.5 | -11.7 | -6.8 | -11.9 | -10.8 | -7.9 | -5.6 | -6.0 |
| |
| Capital expenditures | 0.0 | 0.2 | 0.3 | 0.1 | 0.0 | 3.5 | 0.4 | 0.6 |
| Purchases of property and equipment | 0.0 | 0.2 | 0.3 | 0.1 | 0.0 | 3.5 | 0.4 | 0.6 |
| Purchases of short-term investments, net | 19.4 | 22.1 | 52.2 | 88.3 | 15.9 | 362.2 | 41.7 | 147.1 |
| Purchases of short-term investments | 0.0 | 9.8 | 21.7 | 35.3 | 8.0 | 357.5 | 26.7 | 147.1 |
| Sales of short-term investments | 19.4 | 12.3 | 30.5 | 53.0 | 7.9 | 4.7 | 15.0 | |
| Other cash from investing | 0.1 | -20.0 | -44.0 | -75.1 | -3.7 | -360.1 | -42.5 | -295.5 |
| Cash from investing | 19.5 | 2.3 | 8.5 | 13.2 | 12.2 | 5.6 | -0.5 | -147.8 |
| |
| Repurchase of common stock, net | -7.8 | | | | | | | |
| Other cash from financing | -0.2 | -0.3 | -0.4 | 0.1 | 0.1 | -0.1 | 0.0 | 0.0 |
| Cash from financing | -7.9 | -0.3 | -0.4 | 0.1 | 0.1 | -0.1 | 0.0 | 0.0 |
| |
| Free cash flow | -9.4 | -11.6 | -6.6 | -11.8 | -10.7 | -4.4 | -5.2 | -5.4 |
| Per share (diluted) | ($0.31) | ($0.38) | ($0.21) | ($0.39) | ($0.35) | ($0.16) | ($0.17) | ($0.18) |