| 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 |
| Net income | -2.3 | -2.4 | -2.5 | -2.0 | -2.1 | -2.2 | -2.0 | -1.5 |
| Depreciation and amortization [+] | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.0 | 0.2 |
| Depreciation | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 | 0.1 | 0.0 | 0.2 |
| Stock-based compensation | 0.4 | | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.6 |
| Change in working capital [+] | -2.0 | | 0.2 | -1.4 | -0.1 | 0.4 | -0.7 | -0.1 |
| Accounts receivable | -0.2 | | 0.0 | 0.1 | 0.0 | 0.1 | -0.2 | 0.1 |
| Inventories | -0.2 | | 0.1 | 0.0 | -0.1 | 0.3 | -0.2 | -0.8 |
| Accounts payable | 0.3 | | 0.1 | 0.1 | 0.0 | 0.0 | -0.3 | 0.2 |
| Income taxes | -1.8 | | 0.0 | -1.5 | | | | -1.4 |
| Other | 0.0 | | | | | | | 1.8 |
| Other operating activities | 2.6 | -0.1 | -0.6 | 1.4 | 0.1 | 0.0 | 0.1 | -0.4 |
| Cash from operations | -1.3 | -2.4 | -2.4 | -1.6 | -1.7 | -1.3 | -2.2 | -1.3 |
| |
| Capital expenditures | -0.5 | 0.0 | -0.3 | -0.2 | -0.1 | -0.2 | -0.1 | -0.2 |
| Purchases of property and equipment | -0.5 | | -0.3 | -0.2 | -0.1 | -0.2 | -0.1 | -0.2 |
| Purchases of short-term investments | 5.1 | | -4.9 | | | | | -27.4 |
| Purchases of short-term investments | 5.1 | | -4.9 | | | | | -27.4 |
| Other cash from investing | -3.4 | | | | | | | |
| Cash from investing | 1.2 | 0.0 | -5.2 | -0.2 | -0.1 | -0.2 | -0.1 | -27.6 |
| |
| Issuance of common stock, net | -0.1 | | | | | | | 67.6 |
| Other cash from financing | 0.0 | | -0.5 | 0.0 | 0.0 | 0.0 | -2.0 | 0.0 |
| Cash from financing | -0.1 | 0.0 | -0.5 | 0.0 | 0.0 | 0.0 | -2.0 | 67.6 |
| |
| Free cash flow | -1.8 | -2.4 | -2.8 | -1.9 | -1.8 | -1.5 | -2.3 | -1.5 |
| Per share (diluted) | ($1.12) | ($1.47) | ($0.06) | ($1.17) | ($1.13) | ($0.03) | ($0.05) | ($0.07) |
| |
| Cash paid for interest | 0.0 | | 0.1 | 0.5 | 0.0 | -0.5 | 0.5 | |
| Cash paid for income taxes | | | 0.0 | | | | | |