| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-Q | 8-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Net income | -38.9 | -37.1 | -38.7 | -32.2 | -30.0 | -22.9 | -20.8 | -18.8 |
| Depreciation and amortization | 3.3 | 3.2 | | 2.3 | 2.2 | 1.9 | 0.5 | 0.5 |
| Stock-based compensation | 3.9 | 3.9 | | 5.8 | 5.1 | 4.8 | 2.8 | 1.8 |
| Deferred taxes | | | | | | -5.8 | | |
| Change in working capital [+] | -6.1 | -3.0 | | -4.8 | -10.5 | 9.6 | -2.3 | 1.9 |
| Accounts receivable | -0.8 | 0.2 | | 0.7 | -0.6 | -0.2 | -0.3 | -0.8 |
| Inventories | -1.6 | -5.7 | | -6.2 | -5.9 | -5.6 | -6.7 | -2.6 |
| Other current assets | 1.3 | 0.5 | | 0.6 | -0.3 | 0.7 | -2.5 | 1.4 |
| Accounts payable | -3.8 | 3.0 | | 1.1 | -3.2 | 1.8 | 4.1 | 1.9 |
| Accrued expenses | -1.1 | -1.0 | | -1.0 | -0.4 | -0.1 | 3.0 | 2.1 |
| Other | | | | | | 12.9 | | |
| Other operating activities | 1.0 | 0.6 | | 0.6 | 0.7 | -13.1 | -0.2 | 2.1 |
| Cash from operations | -36.7 | -32.4 | | -28.3 | -32.5 | -25.6 | -20.0 | -12.4 |
| |
| Capital expenditures [+] | -0.5 | -0.4 | | -0.2 | -0.2 | -0.5 | -0.3 | -0.1 |
| Purchases of property and equipment | -0.5 | -0.4 | | -0.2 | -0.2 | -0.5 | -0.3 | -0.1 |
| Sales of property and equipment | | | | | 0.0 | | | 0.1 |
| Purchases of short-term investments, net | 30.0 | 16.9 | | 31.7 | 32.2 | -41.6 | -185.3 | |
| Purchases of short-term investments | | | | -14.6 | -15.0 | -108.1 | -205.3 | |
| Sales of short-term investments | 30.0 | 16.9 | | 46.3 | 47.2 | 66.5 | 20.0 | |
| Other cash from investing | 0.1 | | | -0.2 | -0.1 | -50.5 | | |
| Cash from investing | 29.6 | 16.5 | | 31.2 | 32.0 | -92.5 | -185.6 | 0.1 |
| |
| Issuance of common stock, net | 18.3 | 15.2 | | | | 0.0 | 14.1 | |
| Option exercises | | | | | | | 0.2 | 0.1 |
| Other cash from financing | -0.4 | -0.4 | | 0.2 | 0.0 | 2.0 | -0.1 | -17.0 |
| Cash from financing | 17.9 | 14.9 | | 0.2 | 0.0 | 2.0 | 13.8 | -17.2 |
| |
| Free cash flow | -37.2 | -32.8 | | -28.6 | -32.6 | -26.1 | -20.3 | -12.5 |
| Per share (diluted) | ($1.18) | ($0.11) | | ($1.00) | ($0.11) | ($0.09) | ($0.07) | ($0.04) |
| |
| Cash paid for interest | 0.1 | 0.1 | | 0.1 | 0.1 | 1.4 | 0.0 | 0.2 |