| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 |
| | 10-K | 10-K | 10-K | 10-K |
| Net income | -100.4 | -24.5 | -24.6 | -25.7 |
| Depreciation and amortization [+] | 2.8 | 3.7 | 3.6 | 3.6 |
| Depreciation | 2.8 | 3.7 | 3.6 | 3.6 |
| Stock-based compensation | 26.5 | 10.5 | 2.2 | 2.2 |
| Change in working capital [+] | 44.2 | 55.8 | 5.7 | 0.8 |
| Accounts receivable | -0.3 | -12.7 | -5.0 | -6.6 |
| Other current assets | -1.1 | 0.2 | 0.4 | |
| Accounts payable | -0.4 | 4.9 | -0.3 | -0.3 |
| Deferred revenues | -1.0 | 59.7 | 6.7 | |
| Other | 47.0 | 3.8 | 3.9 | 7.7 |
| Other operating activities | -43.8 | -28.8 | -13.0 | -7.0 |
| Cash from operations | -70.7 | 16.8 | -26.1 | -26.1 |
| |
| Capital expenditures | -7.2 | -2.5 | -1.8 | -1.7 |
| Purchases of property and equipment | -7.2 | -2.5 | -1.8 | -1.7 |
| Purchases of short-term investments, net | -22.1 | -380.9 | -53.0 | -53.0 |
| Purchases of short-term investments | -414.8 | -519.7 | -110.2 | -110.2 |
| Sales of short-term investments | 392.7 | 138.8 | 57.2 | 57.2 |
| Other cash from investing | 12.4 | 1.7 | 0.9 | 0.9 |
| Cash from investing | -16.8 | -381.7 | -53.9 | -53.9 |
| |
| Issuance of common stock, net | | 211.5 | | 0.5 |
| Option exercises | 7.9 | 4.2 | 0.5 | |
| Financing costs | | | -1.9 | |
| Other cash from financing | 15.9 | 334.0 | 27.4 | 28.1 |
| Cash from financing | 8.0 | 541.3 | 28.7 | 28.7 |
| |
| Free cash flow | -77.8 | 14.2 | -27.9 | -27.8 |
| Per share (diluted) | ($1.10) | $0.24 | ($4.65) | $0.00 |
| |
| Cash paid for income taxes | 0.4 | 0.4 | 0.1 | |