| In millions, except per share items | Dec-31-20 | Dec-31-19 | Dec-31-18 |
| | 10-K | 10-K | S-1/A |
| Net income | -41.4 | -23.5 | -11.3 |
| Depreciation and amortization [+] | 0.1 | 0.0 | |
| Depreciation | 0.1 | 0.0 | |
| Stock-based compensation | 2.2 | 0.9 | 0.6 |
| Change in working capital [+] | 2.0 | 2.2 | 1.2 |
| Accounts payable | 0.3 | 0.8 | 0.5 |
| Accrued expenses | 1.7 | 1.3 | |
| Other | 0.0 | 0.1 | 0.8 |
| Other operating activities | -0.4 | -1.5 | 0.8 |
| Cash from operations | -37.4 | -21.9 | -8.8 |
| |
| Capital expenditures | 0.0 | -0.1 | 0.0 |
| Purchases of property and equipment | 0.0 | -0.1 | |
| Purchases of short-term investments, net | -16.7 | -23.9 | |
| Purchases of short-term investments | -64.2 | -23.9 | |
| Sales of short-term investments | 47.5 | | |
| Cash from investing | -16.7 | -24.1 | 0.0 |
| |
| Issuance of common stock, net | 80.4 | | |
| Option exercises | 1.0 | | |
| Other cash from financing | 17.5 | 43.6 | 6.5 |
| Cash from financing | 96.9 | 43.6 | 6.5 |
| |
| Free cash flow | -37.4 | -22.0 | -8.8 |
| Per share (diluted) | ($2.69) | ($31.34) | ($0.01) |