| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | 10-K | 10-K | 10-K | 10-K |
| Net income | -99.4 | -66.9 | -34.3 | -23.4 |
| Depreciation and amortization | 1.6 | 1.0 | 0.9 | 0.8 |
| Stock-based compensation | 11.7 | 3.4 | 1.0 | 1.2 |
| Change in working capital [+] | -0.9 | 0.5 | 1.2 | -6.3 |
| Accounts receivable | 1.0 | -1.0 | -0.1 | 0.6 |
| Other current assets | -1.0 | -4.0 | 0.4 | -1.3 |
| Accounts payable | -2.7 | 1.1 | 0.0 | 1.2 |
| Accrued expenses | 2.0 | 4.3 | 2.3 | 0.7 |
| Deferred revenues | | | -0.6 | -0.8 |
| Other | -0.1 | 0.2 | -0.7 | -6.7 |
| Other operating activities | -4.0 | 29.4 | -2.0 | -4.2 |
| Cash from operations | -91.0 | -32.5 | -33.2 | -32.0 |
| |
| Capital expenditures [+] | -6.5 | -2.1 | -0.3 | -0.9 |
| Purchases of property and equipment | -6.5 | -2.1 | -0.3 | -0.9 |
| Sales of property and equipment | | | 0.0 | |
| Purchases of short-term investments, net | -86.2 | -173.3 | | |
| Purchases of short-term investments | -339.1 | -173.3 | | |
| Sales of short-term investments | 252.9 | | | |
| Other cash from investing | -0.6 | -1.0 | 6.7 | 28.1 |
| Cash from investing | -93.2 | -176.4 | 6.4 | 27.2 |
| |
| Issuance of common stock, net | | 321.0 | 7.7 | 28.1 |
| Option exercises | | | 0.3 | 0.2 |
| Other cash from financing | 2.1 | 112.4 | -5.7 | -27.7 |
| Cash from financing | 2.1 | 433.4 | 1.7 | 0.2 |
| |
| Free cash flow | -97.4 | -34.6 | -33.5 | -32.9 |
| Per share (diluted) | ($1.60) | ($1.09) | ($3.92) | ($3.93) |
| |
| Cash paid for income taxes | | 0.0 | 0.0 | 1.8 |