| 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 | S-1/A | S-1/A |
| Net income | -3.4 | -2.4 | -2.6 | -2.6 | -5.6 | 0.0 | 0.0 |
| Depreciation and amortization | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Asset impairment charges | 1.2 | | | | | | |
| Stock-based compensation | | | | 0.1 | 3.2 | | |
| Change in working capital [+] | 0.1 | 0.1 | 0.3 | 0.3 | 0.1 | 0.1 | 0.0 |
| Other current assets | | | 0.0 | | | | |
| Other | 0.1 | 0.1 | 0.3 | 0.3 | 0.1 | 0.1 | 0.0 |
| Other operating activities | 1.3 | 1.6 | 1.1 | 1.3 | 1.0 | -2.1 | -2.0 |
| Cash from operations | -0.7 | -0.7 | -1.2 | -0.9 | -1.2 | -1.9 | -1.9 |
| |
| Capital expenditures [+] | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 | -0.1 | -0.1 |
| Purchases of property and equipment | | | | | -0.1 | | |
| Capitalized product costs | | | | | | -0.1 | -0.1 |
| Other cash from investing | | | 0.0 | | | | |
| Cash from investing | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 | -0.1 | -0.1 |
| |
| Issuance of common stock, net | 0.0 | 0.1 | 1.6 | 1.1 | 1.2 | | |
| Other cash from financing | 0.6 | 0.6 | -0.4 | -0.1 | 0.0 | 2.1 | 2.0 |
| Cash from financing | 0.6 | 0.7 | 1.2 | 0.9 | 1.2 | 2.1 | 2.0 |
| |
| Free cash flow | -0.7 | -0.7 | -1.2 | -0.9 | -1.3 | -1.9 | -1.9 |
| Per share (diluted) | ($0.01) | ($0.01) | ($0.02) | ($0.02) | ($0.03) | ($42.61) | ($46.06) |
| |
| Cash paid for interest | 0.0 | 0.0 | | | | | |
| Cash paid for income taxes | 0.0 | 0.0 | 0.0 | | | | |