| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 |
| | 10-K | 10-K | S-1/A |
| Net income | -32.1 | -28.9 | -24.1 |
| Depreciation and amortization [+] | 0.1 | 0.1 | 0.1 |
| Depreciation | 0.1 | 0.1 | 0.1 |
| Stock-based compensation | 1.9 | 1.1 | 1.3 |
| Change in working capital [+] | -3.6 | 2.0 | 0.7 |
| Other current assets | -0.8 | -0.4 | 0.3 |
| Accounts payable | 0.3 | 0.8 | 0.8 |
| Accrued expenses | -3.1 | 1.5 | -0.4 |
| Other operating activities | 3.0 | 1.8 | 2.0 |
| Cash from operations | -30.7 | -23.9 | -20.0 |
| |
| Capital expenditures | -0.1 | -0.1 | 0.0 |
| Purchases of property and equipment | -0.1 | -0.1 | |
| Sales of short-term investments, net [+] | 11.0 | 22.1 | -24.2 |
| Purchases of short-term investments | -18.9 | -20.2 | -67.3 |
| Sales of short-term investments | 30.0 | 42.3 | 43.2 |
| Cash from investing | 11.0 | 22.0 | -24.2 |
| |
| Issuance of common stock, net | 2.5 | | |
| Option exercises | 0.1 | 0.1 | 0.0 |
| Financing costs | -0.4 | | |
| Other cash from financing | 8.3 | 0.1 | 12.9 |
| Cash from financing | 11.1 | 0.0 | 12.9 |
| |
| Free cash flow | -30.8 | -24.0 | -20.0 |
| Per share (diluted) | ($1.55) | ($1.33) | ($0.65) |