| 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 | | | -8.8 | -8.3 | -7.8 | -8.1 | -7.5 | -7.6 |
| Depreciation and amortization [+] | | | 0.2 | 0.1 | 0.3 | 0.2 | 0.2 | 0.2 |
| Depreciation | | | 0.2 | 0.1 | 0.3 | 0.2 | 0.2 | 0.2 |
| Stock-based compensation | | | 1.6 | 1.5 | 1.8 | 1.3 | 0.9 | 0.6 |
| Change in working capital [+] | | | -0.9 | -1.8 | -0.6 | -1.0 | -1.2 | -0.1 |
| Accounts receivable | | | 0.2 | -0.1 | 0.0 | 0.0 | -0.2 | 0.1 |
| Inventories | | | 0.2 | 0.0 | -0.8 | -0.8 | -1.1 | -0.8 |
| Accounts payable | | | 0.2 | -0.2 | -0.1 | -0.1 | 0.0 | 0.2 |
| Income taxes | | | -1.5 | -1.5 | | | | -1.4 |
| Other | | | | | | | | 1.8 |
| Other operating activities | | | 1.0 | 1.7 | -0.2 | -0.8 | -0.5 | -0.5 |
| Cash from operations | | | -7.0 | -6.8 | -6.4 | -8.4 | -8.1 | -7.4 |
| |
| Capital expenditures | | | -0.8 | -0.6 | -0.6 | -0.5 | -0.3 | -0.2 |
| Purchases of property and equipment | | | -0.8 | -0.6 | -0.6 | -0.5 | -0.3 | -0.2 |
| Purchases of short-term investments | | | -4.9 | | | | | -27.4 |
| Purchases of short-term investments | | | -4.9 | | | | | -27.4 |
| Cash from investing | | | -5.7 | -0.6 | -28.0 | -27.8 | -27.7 | -27.6 |
| |
| Issuance of common stock, net | | | | | | | | 67.6 |
| Other cash from financing | | | -0.6 | -2.1 | -2.1 | -2.0 | -2.0 | 0.0 |
| Cash from financing | | | -0.6 | -2.1 | 65.5 | 43.7 | 65.6 | 67.6 |
| |
| Free cash flow | | | -7.9 | -7.4 | -7.0 | -8.8 | -8.4 | -7.6 |
| Per share (diluted) | | | ($0.32) | ($0.30) | ($0.24) | ($0.26) | ($0.32) | ($0.48) |
| |
| Cash paid for interest | | | 0.1 | 0.5 | 0.0 | 0.0 | 0.5 | |
| Cash paid for income taxes | | | 0.0 | | | | | |