| 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 | 8-K | 8-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | -38.4 | 28.8 | 24.6 | -26.8 | -25.1 | -25.6 | -26.3 | -28.3 |
| Depreciation and amortization [+] | | | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Depreciation | | | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Stock-based compensation | | | | 2.5 | -2.5 | 2.5 | 2.2 | 2.3 |
| Deferred taxes | | | | | | | -0.2 | |
| Change in working capital [+] | | | | 9.0 | 1.7 | -1.7 | -24.5 | 12.2 |
| Other current assets | | | | 0.7 | -1.9 | 1.9 | -1.6 | -0.1 |
| Accounts payable | | | | 9.2 | 2.4 | -2.4 | -5.7 | 10.6 |
| Accrued expenses | | | | -1.0 | 1.2 | -1.2 | 2.9 | 1.7 |
| Other | | | | | | | -20.1 | |
| Other operating activities | -26.1 | | | 0.5 | 11.1 | 0.4 | 20.5 | 0.4 |
| Cash from operations | -64.5 | | | -14.8 | -14.8 | -24.3 | -28.2 | -13.5 |
| |
| Capital expenditures | 0.0 | | | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Purchases of property and equipment | | | | | 0.0 | 0.0 | 0.0 | 0.0 |
| Sales of short-term investments, net [+] | 82.9 | | | -42.1 | 33.1 | 26.8 | 19.1 | 17.4 |
| Purchases of short-term investments | | | | -69.4 | 9.4 | -9.4 | -21.7 | -26.3 |
| Sales of short-term investments | 82.9 | | | 27.3 | 23.7 | 36.2 | 40.8 | 43.7 |
| Other cash from investing | -180.6 | | | | -40.7 | | | |
| Cash from investing | -97.7 | | | -42.1 | -7.6 | 26.8 | 19.1 | 17.4 |
| |
| Issuance of common stock, net | 0.1 | | | | 0.0 | | | |
| Option exercises | 0.5 | | | 0.2 | | 0.0 | 0.0 | 0.1 |
| Other cash from financing | 352.8 | | | 68.8 | 28.1 | 0.1 | 21.9 | 0.2 |
| Cash from financing | 352.4 | | | 68.6 | 28.2 | 0.0 | 21.9 | 0.1 |
| |
| Free cash flow | -64.5 | | | -14.8 | -14.8 | -24.4 | -28.3 | -13.5 |
| Per share (diluted) | ($0.87) | | | ($0.31) | ($0.73) | ($1.20) | ($1.41) | ($0.67) |
| |
| Cash paid for interest | 1.2 | | | 0.3 | 0.2 | 0.2 | | 0.0 |