| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 8-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 0.0 | -13.0 | -12.9 | -12.1 | -67.4 | -25.7 |
| Depreciation and amortization [+] | | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 |
| Depreciation | | 0.1 | 0.1 | 0.1 | 0.0 | 0.1 |
| Amortization of intangible assets | | | | 0.0 | 0.0 | 0.0 |
| Stock-based compensation | | 1.3 | 1.0 | 0.1 | 2.8 | |
| Change in working capital [+] | | -1.5 | -0.5 | -0.5 | 4.7 | -0.1 |
| Accounts receivable | | -0.1 | 0.0 | 0.0 | -0.1 | 0.0 |
| Inventories | | -2.1 | 0.0 | -1.3 | -0.7 | -0.4 |
| Other current assets | | -0.2 | 0.1 | -0.5 | -0.2 | -0.1 |
| Accounts payable | | 0.9 | -0.9 | 1.0 | -0.8 | 0.3 |
| Accrued expenses | | 0.0 | 0.3 | 0.3 | 0.1 | -1.4 |
| Other | | | | | 6.3 | 1.5 |
| Other operating activities | | 1.6 | 2.6 | 1.3 | 49.8 | 15.3 |
| Cash from operations | | -11.5 | -9.9 | -11.0 | -10.0 | -10.4 |
| |
| Capital expenditures [+] | | -0.1 | -0.1 | 0.0 | 0.0 | -0.1 |
| Purchases of property and equipment | | -0.1 | -0.1 | 0.0 | | -0.1 |
| Sales of property and equipment | | | | 0.0 | | |
| Purchases of intangible assets | | | | | | -0.1 |
| Other cash from investing | | | | | -0.1 | |
| Cash from investing | | -0.1 | -0.1 | 0.0 | -0.1 | -0.2 |
| |
| Issuance of common stock, net | | 8.3 | | | 10.3 | 0.0 |
| Other cash from financing | | 9.0 | 17.0 | 8.1 | 2.7 | 10.7 |
| Cash from financing | | 17.3 | 17.0 | 8.1 | 13.0 | 10.7 |
| |
| Free cash flow | | -11.6 | -9.9 | -11.1 | -10.0 | -10.5 |
| Per share (diluted) | | ($0.94) | ($1.89) | ($11.67) | ($1.47) | ($30.93) |
| |
| Cash paid for interest | | 0.0 | 0.4 | | | |