| 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-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Net income | -3.3 | -1.8 | -4.2 | -5.0 | -7.2 | -8.9 | -7.6 | -8.4 |
| Depreciation and amortization | 0.2 | 0.2 | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 |
| Stock-based compensation | 0.3 | 0.2 | 0.2 | 0.1 | -0.2 | 0.4 | 0.4 | 0.4 |
| Change in working capital [+] | 0.9 | -1.2 | 2.9 | -1.0 | -2.2 | 4.7 | 0.3 | 3.3 |
| Accounts receivable | 0.6 | 0.2 | 0.7 | -1.0 | -1.2 | 0.1 | -0.7 | 1.2 |
| Inventories | -0.2 | 0.2 | 0.1 | 0.4 | -1.5 | -0.1 | 0.2 | -0.4 |
| Other current assets | 0.5 | 0.5 | 0.8 | 0.6 | 0.6 | | 0.5 | 1.0 |
| Accounts payable | 0.7 | 1.1 | 0.1 | -1.3 | 0.5 | -1.1 | -0.1 | 1.6 |
| Other | -0.7 | -3.3 | 1.1 | 0.3 | -0.6 | 5.8 | 0.3 | -0.2 |
| Other operating activities | 0.2 | -1.3 | -0.1 | -0.2 | -0.4 | -5.3 | -0.3 | -0.4 |
| Cash from operations | -1.7 | -3.9 | -1.1 | -5.9 | -9.8 | -9.0 | -7.1 | -4.9 |
| |
| Capital expenditures | -0.1 | -0.1 | -0.1 | -0.1 | 0.0 | -0.1 | -0.1 | -0.2 |
| Purchases of property and equipment | -0.1 | -0.1 | -0.1 | -0.1 | 0.0 | -0.1 | -0.1 | -0.2 |
| Sales of short-term investments, net [+] | 0.0 | 5.4 | -14.6 | | 9.2 | 0.7 | -1.2 | 1.9 |
| Purchases of short-term investments | -1.8 | -2.1 | -14.6 | | -2.8 | -7.0 | -5.3 | -6.6 |
| Sales of short-term investments | 1.8 | 7.5 | | | 12.0 | 7.6 | 4.1 | 8.4 |
| Cash from investing | -0.1 | 5.3 | -14.7 | -0.1 | 9.1 | 0.5 | -1.4 | 1.6 |
| |
| Issuance of common stock, net | | | | 15.0 | | | | |
| Option exercises | | | | | | | 0.1 | |
| Other cash from financing | -0.1 | -0.6 | -2.0 | 11.8 | -2.7 | -1.6 | -0.4 | 0.0 |
| Cash from financing | -0.1 | -0.6 | -2.0 | 26.8 | -2.7 | -1.6 | -0.5 | 0.0 |
| |
| Free cash flow | -1.8 | -4.0 | -1.2 | -6.0 | -9.8 | -9.1 | -7.2 | -5.2 |
| Per share (diluted) | ($0.10) | ($0.22) | ($0.12) | ($0.51) | ($1.15) | ($0.10) | ($0.84) | ($0.61) |
| |
| Cash paid for interest | | 0.3 | 0.3 | 0.5 | 0.5 | 0.5 | 0.3 | 0.5 |