| 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/A | S-1/A | S-1 |
| Net income | -4.7 | -4.3 | -2.3 | -1.9 | -1.9 | -1.0 | -1.8 |
| Depreciation and amortization | 0.1 | 0.1 | 0.1 | 0.1 | 0.3 | 0.3 | 0.3 |
| Asset impairment charges | | | | | 0.0 | | |
| Stock-based compensation | 0.3 | 0.3 | 0.2 | 0.0 | | | |
| Deferred taxes | | | | | | 0.0 | -0.1 |
| Change in working capital [+] | -0.2 | -0.6 | 0.2 | 0.0 | 0.0 | -0.1 | 0.2 |
| Accounts receivable | 0.0 | -0.1 | 0.0 | -0.1 | 0.1 | 0.0 | 0.2 |
| Inventories | -0.2 | -0.1 | -0.1 | 0.0 | 0.0 | 0.1 | 0.0 |
| Other current assets | -0.1 | 0.1 | 0.0 | 0.2 | -0.2 | | |
| Accounts payable | 0.0 | -0.4 | 0.1 | 0.2 | 0.1 | -0.1 | 0.0 |
| Accrued expenses | 0.1 | 0.0 | 0.1 | -0.3 | 0.1 | | |
| Deferred revenues | | 0.0 | 0.0 | | | | |
| Other | | | | | | -0.1 | 0.0 |
| Other operating activities | 1.5 | 1.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Cash from operations | -3.0 | -2.8 | -1.8 | -1.8 | -1.5 | -0.8 | -1.3 |
| |
| Capital expenditures | -0.1 | -0.3 | -0.3 | 0.0 | 0.0 | 0.0 | 0.0 |
| Purchases of property and equipment | -0.1 | -0.3 | -0.3 | | | | |
| Purchases of short-term investments, net | -5.5 | | | | | | |
| Purchases of short-term investments | -7.0 | | | | | | |
| Sales of short-term investments | 1.5 | | | | | | |
| Other cash from investing | | | | | | 0.0 | |
| Cash from investing | -5.6 | -0.3 | -0.3 | 0.0 | 0.0 | 0.0 | 0.0 |
| |
| Issuance of common stock, net | | 13.5 | 1.4 | 0.7 | | | |
| Financing costs | | -0.1 | | | | | |
| Other cash from financing | -3.7 | 2.8 | 0.5 | 1.3 | 1.5 | 0.8 | 1.3 |
| Cash from financing | -3.7 | 16.3 | 1.9 | 2.1 | 1.5 | 0.8 | 1.3 |
| |
| Free cash flow | -3.1 | -3.0 | -2.1 | -1.8 | -1.5 | -0.8 | -1.3 |
| Per share (diluted) | ($0.55) | ($1.01) | ($0.94) | ($0.13) | ($0.31) | | |
| |