| 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 | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Net income | -35.5 | -40.6 | -54.4 | -37.8 | -108.5 | -79.1 | -106.9 | -60.2 |
| Depreciation and amortization [+] | 1.6 | | 1.0 | 1.0 | 1.1 | 1.1 | 1.1 | 0.9 |
| Depreciation | 1.4 | | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 | 0.7 |
| Amortization of intangible assets | 0.1 | | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Asset impairment charges | 2.0 | | | | | | | |
| Stock-based compensation | 6.7 | | 3.3 | 3.2 | 8.3 | 7.7 | 5.5 | 5.6 |
| Change in working capital [+] | 3.9 | | 77.8 | -30.3 | 38.5 | -1.4 | 141.6 | 3.5 |
| Accounts receivable | 6.6 | | -1.7 | 1.3 | -3.9 | 0.5 | -0.9 | 6.7 |
| Other current assets | 41.2 | | 13.8 | -1.6 | -24.7 | 7.1 | 46.2 | -0.4 |
| Other | -44.0 | | 65.6 | -30.1 | 67.1 | -9.0 | 96.2 | -2.8 |
| Other operating activities | -47.6 | | -64.0 | -3.6 | 10.0 | 9.8 | -79.1 | 3.7 |
| Cash from operations | -69.0 | | -36.3 | -67.5 | -50.5 | -61.9 | -37.9 | -46.5 |
| |
| Capital expenditures [+] | -0.3 | | -0.2 | -0.1 | -0.7 | 0.0 | -0.6 | -0.2 |
| Purchases of property and equipment | -0.3 | | -0.2 | -0.1 | -0.7 | | -0.6 | -0.2 |
| Sales of property and equipment | 6.1 | | | | | | | |
| Sales of short-term investments, net [+] | 67.2 | | 54.2 | 44.6 | -9.6 | 23.3 | -5.9 | 56.1 |
| Purchases of short-term investments | -106.7 | | -45.0 | -64.2 | -39.7 | -99.7 | -40.5 | -0.6 |
| Sales of short-term investments | 173.9 | | 99.1 | 108.8 | 30.1 | 123.1 | 34.6 | 56.7 |
| Other cash from investing | | | | | | -2.0 | | |
| Cash from investing | 72.9 | | 54.0 | 44.6 | -10.3 | 21.3 | -6.5 | 56.0 |
| |
| Issuance of common stock, net | 2.9 | | 6.7 | 3.8 | 43.2 | 29.4 | 47.3 | |
| Option exercises | | | | 0.1 | 0.1 | 0.1 | 0.3 | 0.3 |
| Other cash from financing | -0.5 | | | 0.1 | -0.1 | -0.9 | 0.5 | -0.2 |
| Cash from financing | 2.5 | | 6.7 | 3.8 | 42.9 | 28.4 | 47.6 | -0.4 |
| |
| Free cash flow | -69.3 | | -36.5 | -67.6 | -51.2 | -61.9 | -38.5 | -46.7 |
| Per share (diluted) | ($0.26) | | ($0.15) | ($0.27) | ($0.22) | ($0.28) | ($0.18) | ($0.22) |
| |
| Cash paid for interest | 0.5 | | | 0.5 | | 0.5 | | 0.5 |