| 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 | Dec-31-15 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | -19.8 | -6.0 | 1.6 | -4.9 | -16.0 | -18.6 | -38.9 | -45.8 |
| Depreciation and amortization | 0.1 | 0.1 | 0.2 | 0.2 | 0.4 | 1.2 | 3.6 | 5.6 |
| Asset impairment charges | | | | | | 0.4 | | 0.0 |
| Stock-based compensation | | | | 0.0 | 0.0 | 0.1 | 0.9 | 0.9 |
| Change in working capital [+] | 0.7 | 0.3 | -0.6 | 0.4 | 2.8 | 2.6 | 4.4 | 0.0 |
| Accounts receivable | | | 0.0 | 0.2 | -0.2 | 0.6 | 1.3 | 0.7 |
| Inventories | | | 0.0 | 0.1 | 0.4 | 1.2 | 1.7 | -1.8 |
| Accounts payable | | | -0.3 | -0.3 | 1.0 | 0.4 | 1.5 | 2.1 |
| Accrued expenses | | | 0.4 | 0.1 | 1.1 | 0.0 | -0.5 | -1.2 |
| Other | 0.7 | 0.3 | -0.7 | 0.3 | 0.5 | 0.4 | 0.4 | 0.2 |
| Other operating activities | 8.5 | -3.8 | -4.0 | 1.5 | 8.9 | 1.7 | 13.1 | 17.2 |
| Cash from operations | -10.5 | -9.4 | -2.9 | -2.7 | -4.0 | -12.6 | -16.9 | -22.1 |
| |
| Capital expenditures [+] | 0.2 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 | 0.0 |
| Purchases of property and equipment | 0.2 | 0.3 | | 0.0 | | 0.0 | -0.1 | 0.0 |
| Sales of property and equipment | | | 0.3 | 0.8 | 0.0 | | | |
| Purchases of intangible assets | | | | 0.0 | 0.0 | | | -0.3 |
| Other cash from investing | -0.4 | -0.6 | 0.0 | | | 0.1 | -0.1 | 0.1 |
| Cash from investing | -0.3 | -0.3 | 0.3 | 0.8 | 0.0 | 0.1 | -0.2 | -0.2 |
| |
| Issuance of common stock, net | | | 2.5 | | | | 1.1 | 2.0 |
| Financing costs | | | | 0.0 | 0.0 | 0.0 | -0.1 | -0.5 |
| Other cash from financing | 16.3 | 15.5 | 0.3 | 1.9 | 3.9 | 12.5 | 15.7 | 16.8 |
| Cash from financing | 16.3 | 15.5 | 2.8 | 1.9 | 3.9 | 12.5 | 16.8 | 19.3 |
| |
| Free cash flow | -10.3 | -9.1 | -2.9 | -2.7 | -4.0 | -12.6 | -16.9 | -22.1 |
| Per share (diluted) | ($0.35) | ($2.34) | ($0.78) | $0.00 | ($0.17) | ($2.14) | ($0.18) | ($0.41) |
| |
| Cash paid for interest | | | | 0.0 | 0.2 | 1.2 | 0.4 | 0.5 |