| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K/A | 10-K | 10-K | S-1/A |
| Net income | -14.1 | -38.6 | -29.9 | -25.8 | -8.9 | 0.0 |
| Depreciation and amortization | 2.4 | 2.1 | 2.7 | 3.5 | 1.9 | |
| Asset impairment charges | | 1.6 | 0.7 | 3.1 | | |
| Stock-based compensation | 1.6 | 1.1 | 1.1 | 6.3 | 0.3 | |
| Deferred taxes | | 0.0 | 0.0 | 0.1 | 0.1 | |
| Change in working capital [+] | 5.3 | -1.0 | 17.1 | -15.9 | 2.2 | |
| Accounts receivable | -11.6 | -7.5 | 5.9 | 8.7 | -8.1 | |
| Inventories | 1.6 | 4.2 | 7.5 | -0.8 | -12.8 | |
| Other current assets | 4.0 | 1.6 | -1.1 | 3.7 | -4.1 | |
| Accounts payable | 11.7 | 0.6 | 1.5 | -20.2 | 16.0 | |
| Accrued expenses | -0.4 | -0.1 | 1.2 | -6.1 | 7.4 | |
| Other | 0.0 | 0.2 | 2.2 | -1.2 | 3.8 | |
| Other operating activities | -7.5 | -3.6 | -2.3 | -4.9 | 8.3 | |
| Cash from operations | -12.4 | -38.5 | -10.6 | -33.5 | 3.9 | |
| |
| Capital expenditures [+] | 0.0 | 0.0 | 0.0 | -1.4 | -2.5 | |
| Purchases of property and equipment | 0.0 | 0.0 | 0.0 | -1.0 | -0.8 | |
| Capitalized product costs | | | | -0.4 | -1.8 | |
| Cash from investing | 0.0 | 0.0 | 0.0 | -1.4 | -2.5 | |
| |
| Issuance of common stock, net | 14.4 | 27.7 | 25.1 | 38.5 | 8.3 | |
| Option exercises | | 0.1 | 0.4 | 0.2 | 0.0 | |
| Other cash from financing | -0.1 | 0.0 | -3.3 | -5.1 | 1.9 | |
| Cash from financing | 14.3 | 27.6 | 21.4 | 33.1 | 10.2 | |
| |
| Free cash flow | -12.4 | -38.5 | -10.6 | -34.5 | 3.1 | |
| Per share (diluted) | ($0.43) | ($4.07) | ($2.29) | ($1.87) | $0.38 | |
| |
| Cash paid for interest | 0.1 | | 0.3 | 1.0 | 0.5 | |
| Cash paid for income taxes | 0.2 | 0.1 | 0.1 | 0.3 | 0.3 | |