| In millions, except per share items | Jun-30-23 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Net income | -14.7 | -18.1 | -18.3 | -14.2 | -12.9 | -11.4 | -9.3 | -6.8 |
| Depreciation and amortization | | 0.4 | 0.3 | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 |
| Stock-based compensation | | | | 1.0 | 1.1 | | | 0.6 |
| Change in working capital [+] | | | | 3.2 | 1.5 | | | 0.2 |
| Other current assets | | | | 0.9 | 0.8 | | | -0.4 |
| Accounts payable | | | | 1.1 | -0.3 | | | 0.0 |
| Accrued expenses | | | | 1.1 | 1.1 | | | 0.5 |
| Other | | | | 0.0 | | | | |
| Other operating activities | 14.7 | 0.5 | 1.7 | 0.0 | 0.1 | 0.2 | 0.1 | 0.2 |
| Cash from operations | 0.0 | -17.3 | -16.3 | -9.8 | -10.1 | -11.0 | -9.0 | -5.7 |
| |
| Capital expenditures | 0.0 | 1.1 | 1.3 | -1.2 | -0.7 | 0.3 | 0.2 | -0.2 |
| Purchases of property and equipment | | 1.1 | 1.3 | -1.2 | -0.7 | 0.3 | 0.2 | -0.2 |
| Purchases of short-term investments, net | | 48.0 | 40.0 | 1.9 | 2.4 | 140.5 | 34.3 | -104.1 |
| Purchases of short-term investments | | 48.0 | 40.0 | -65.1 | -35.9 | 140.5 | 34.3 | -107.1 |
| Sales of short-term investments | | | | 67.0 | 38.4 | | | 3.0 |
| Other cash from investing | | -29.2 | -20.9 | | | -241.0 | -33.2 | 0.0 |
| Cash from investing | 0.0 | 19.9 | 20.4 | 0.7 | 1.7 | -100.1 | 1.3 | -104.4 |
| |
| Issuance of common stock, net | | | | | | 139.5 | | |
| Option exercises | | 0.0 | 0.0 | 0.2 | 0.1 | | 0.0 | 0.0 |
| Other cash from financing | | 0.1 | 0.1 | 0.6 | -0.5 | -2.0 | 0.0 | -0.5 |
| Cash from financing | 0.0 | 0.1 | 0.0 | 0.4 | -0.6 | 137.5 | 0.0 | -0.5 |
| |
| Free cash flow | 0.0 | -16.2 | -14.9 | -11.0 | -10.9 | -10.6 | -8.9 | -5.9 |
| Per share (diluted) | $0.00 | ($0.39) | ($0.36) | ($0.38) | ($0.27) | ($0.39) | ($1.24) | ($0.88) |