| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-Q | 8-K | 10-Q | 10-Q | 10-K | 10-Q/A | 10-Q |
| Net income | -21.4 | -23.6 | -21.2 | -42.4 | -27.7 | -22.2 | -13.5 | -99.5 |
| Depreciation and amortization [+] | 0.3 | 0.3 | | 0.1 | 0.3 | 0.2 | 0.1 | 0.1 |
| Depreciation | 0.3 | 0.3 | | 0.1 | 0.3 | 0.2 | 0.3 | 0.1 |
| Stock-based compensation | 4.5 | 4.3 | | 4.5 | 4.7 | 3.4 | 2.2 | 1.4 |
| Change in working capital [+] | -0.1 | 2.3 | | -1.1 | 9.7 | -12.9 | -42.2 | 6.0 |
| Accounts receivable | | | | | | | -20.0 | |
| Other current assets | 3.6 | 0.2 | | 1.7 | 1.5 | -4.4 | -3.8 | -1.5 |
| Accounts payable | -3.5 | 4.0 | | -5.7 | 3.8 | 1.0 | -28.8 | 27.3 |
| Accrued expenses | 1.1 | -3.3 | | 2.7 | 4.7 | -2.8 | 11.6 | -20.5 |
| Other | -1.2 | 1.5 | | 0.3 | -0.2 | -6.7 | -1.1 | 0.8 |
| Other operating activities | -2.6 | -1.0 | | -0.6 | -0.1 | 1.1 | 14.6 | -1.0 |
| Cash from operations | -19.3 | -17.6 | | -39.4 | -13.1 | -30.4 | -38.8 | -92.9 |
| |
| Capital expenditures | -0.1 | 0.0 | | -0.3 | -0.3 | -0.8 | -0.1 | 0.0 |
| Purchases of property and equipment | -0.1 | 0.0 | | -0.3 | -0.3 | -0.8 | -0.1 | 0.0 |
| Purchases of short-term investments, net | 22.0 | 40.6 | | 34.0 | -75.0 | -155.0 | | |
| Purchases of short-term investments | -42.0 | -45.8 | | -32.8 | -93.4 | -155.0 | | |
| Sales of short-term investments | 64.0 | 86.4 | | 66.8 | 18.4 | | | |
| Cash from investing | 22.0 | 40.5 | | 33.6 | -75.3 | -155.8 | -0.1 | 0.0 |
| |
| Issuance of common stock, net | | | | | | 311.1 | | |
| Option exercises | | | | 1.7 | | 0.2 | 5.3 | |
| Other cash from financing | | | | 3.4 | | -5.8 | 10.6 | |
| Cash from financing | 0.0 | 0.0 | | 1.7 | 0.0 | 305.0 | 5.3 | 0.0 |
| |
| Free cash flow | -19.4 | -17.7 | | -39.7 | -13.4 | -31.2 | -38.9 | -92.9 |
| Per share (diluted) | ($0.18) | ($0.16) | | ($0.37) | ($0.13) | ($0.91) | ($1.88) | ($4.54) |