| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Net income | -75.2 | -41.1 | -38.1 | -38.2 | -21.1 | -34.9 | -22.2 |
| Depreciation and amortization | 3.9 | 3.7 | 3.3 | 3.3 | 2.8 | 1.9 | 0.6 |
| Asset impairment charges | 1.6 | 0.3 | 1.2 | 0.1 | 0.2 | | |
| Stock-based compensation | 13.4 | 10.4 | 5.7 | 6.5 | 7.3 | 3.3 | 3.1 |
| Deferred taxes | 0.1 | 0.0 | -0.3 | | | | |
| Change in working capital [+] | -16.8 | 0.9 | 17.3 | -4.5 | -14.0 | -13.8 | -1.7 |
| Accounts receivable | -12.3 | -6.7 | 3.8 | -5.5 | -4.7 | -6.9 | -4.7 |
| Inventories | -10.9 | -7.6 | 4.8 | -3.4 | -7.0 | -6.4 | -1.4 |
| Other current assets | -4.5 | -1.6 | 1.1 | -2.5 | -2.2 | -1.7 | |
| Accounts payable | 4.4 | 5.0 | -0.6 | 1.8 | -3.9 | -0.9 | 3.9 |
| Accrued expenses | 2.8 | 4.7 | 3.1 | 4.6 | 3.8 | 1.1 | |
| Other | 3.7 | 7.2 | 5.1 | 0.4 | 0.0 | 1.0 | 0.5 |
| Other operating activities | 21.0 | -1.8 | -1.6 | 2.8 | -9.1 | 11.4 | 5.8 |
| Cash from operations | -52.2 | -27.5 | -12.5 | -30.0 | -33.9 | -32.0 | -14.3 |
| |
| Capital expenditures [+] | -32.8 | -5.3 | -2.4 | -6.3 | -1.7 | -0.9 | -10.5 |
| Purchases of property and equipment | -2.9 | -2.4 | -2.1 | -6.3 | -1.7 | -0.9 | -10.5 |
| Capitalized product costs | -29.9 | -2.9 | -0.3 | | | | |
| Purchases of intangible assets | -1.5 | -1.4 | -1.5 | -0.7 | 0.0 | 0.0 | |
| Acquisitions | | | | | | | -0.1 |
| Other cash from investing | -0.5 | -0.4 | -1.7 | -0.8 | -4.0 | 0.1 | -0.1 |
| Cash from investing | -34.8 | -7.2 | -5.6 | -7.8 | -5.7 | -0.8 | -10.8 |
| |
| Issuance of common stock, net | | | 63.9 | | | -4.5 | |
| Option exercises | 3.9 | 4.6 | 1.2 | 0.7 | 0.6 | | |
| Other cash from financing | 104.1 | 8.6 | 2.1 | 23.5 | 82.2 | 47.5 | 1.5 |
| Cash from financing | 100.3 | 4.1 | 64.7 | 22.8 | 81.5 | 43.0 | 1.5 |
| |
| Free cash flow | -55.0 | -30.0 | -14.6 | -36.3 | -35.6 | -32.9 | -24.7 |
| Per share (diluted) | ($3.47) | ($1.37) | ($0.64) | ($1.77) | ($2.05) | ($3.21) | |
| |
| Cash paid for interest | 5.4 | 6.9 | 7.0 | 5.9 | 5.4 | 2.9 | |
| Cash paid for income taxes | 2.1 | 0.7 | 0.3 | 0.6 | 0.1 | 0.1 | |