| 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-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Net loss | | | -10.9 | -10.4 | -9.8 | | -9.6 | -7.6 |
| Adjustments to reconcile net loss to net cash used in operating activities: | | | | | | | | |
| Stock-based compensation | | | 1.6 | 1.5 | 1.2 | 0.7 | 0.3 | |
| Changes in assets and liabilities: | | | | | | | | |
| Accounts receivable | | | 0.2 | -0.1 | -0.1 | -0.1 | -0.3 | |
| Accounts payable | | | 0.2 | -0.2 | -0.3 | -0.3 | -0.1 | |
| Other assets and liabilities | | | -0.6 | 0.1 | 0.1 | -0.3 | 0.1 | -0.1 |
| Net cash used in operating activities | | | -7.0 | -6.8 | -6.4 | -8.4 | -8.1 | -7.4 |
| |
| Cash flows from investing activities: | | | | | | | | |
| Purchases of property and equipment | | | -0.8 | -0.6 | -0.6 | -0.5 | -0.3 | -0.2 |
| Purchases of short-term investments | | | | | | | | |
| Proceeds from short-term investments | | | | | | | | |
| Net cash used in investing activities | | | -5.7 | -0.6 | -28.0 | -27.8 | -27.7 | -27.6 |
| |
| Cash flows from financing activities: | | | | | | | | |
| Net cash used in financing activities | | | -0.6 | -2.1 | -2.1 | -23.8 | -2.0 | |
| Net change in cash and cash equivalents | | | -13.4 | -9.5 | -7.6 | -25.1 | -2.8 | |
| |
| Supplemental disclosures of cash flow information: | | | | | | | | |
| Cash paid for interest | | | 0.1 | 0.5 | 0.0 | 0.0 | 0.5 | |
| Income taxes paid | | | 0.0 | | | | | |