| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 | Dec-31-16 | Dec-31-15 | Dec-31-14 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K |
| Net income | 83.0 | 104.9 | 69.4 | 30.3 | 24.1 | -12.6 | 43.8 | -21.6 |
| Depreciation and amortization [+] | 6.6 | 3.9 | 1.2 | 1.0 | 0.2 | 0.1 | 1.0 | 1.3 |
| Depreciation | 6.6 | 3.9 | 1.2 | 1.0 | 0.2 | 0.1 | 1.0 | 1.3 |
| Stock-based compensation | 16.6 | 11.8 | 5.9 | 4.0 | 1.8 | 0.1 | 6.8 | 5.5 |
| Change in working capital [+] | 67.9 | 13.8 | 47.2 | 2.8 | 6.0 | 5.8 | -79.1 | -13.0 |
| Other current assets | | | | | 0.0 | 0.1 | -0.8 | 1.3 |
| Accounts payable | -0.8 | 0.5 | 0.7 | -1.7 | 1.2 | 0.6 | -1.3 | 0.4 |
| Accrued expenses | -3.3 | -2.7 | 6.5 | 2.7 | 0.2 | 0.8 | 0.1 | 0.0 |
| Deferred revenues | 47.7 | -8.9 | 27.5 | | | 0.4 | -76.9 | -14.7 |
| Other | 24.2 | 24.8 | 12.5 | 1.9 | 4.7 | 4.0 | -0.1 | 0.0 |
| Other operating activities | -204.6 | -218.2 | -148.9 | -42.6 | -46.4 | -2.4 | -10.6 | 0.1 |
| Cash from operations | -30.4 | -83.8 | -25.2 | -4.5 | -14.3 | -9.0 | -38.0 | -27.7 |
| |
| Capital expenditures [+] | -4.0 | -7.4 | -9.6 | -5.7 | -1.5 | -0.7 | -0.1 | -0.2 |
| Purchases of property and equipment | -4.0 | -7.4 | -9.6 | -5.7 | -1.1 | -0.1 | -0.1 | -0.2 |
| Capitalized product costs | | | | | -0.4 | -0.6 | | |
| Sales of property and equipment | | 0.0 | | | | | | |
| Purchases of short-term investments, net | -58.4 | -27.3 | -30.1 | -10.2 | | | 10.4 | 23.6 |
| Purchases of short-term investments | -211.0 | -132.8 | -90.2 | -10.2 | | | -56.8 | -44.9 |
| Sales of short-term investments | 152.6 | 105.5 | 60.1 | | | | 67.2 | 68.5 |
| Other cash from investing | | | | | 11.2 | | | |
| Cash from investing | -62.4 | -34.7 | -39.7 | -15.9 | 9.7 | -0.7 | 10.3 | 23.3 |
| |
| Issuance of common stock, net | 71.1 | 48.4 | 63.9 | 48.1 | 57.6 | | 28.9 | 5.5 |
| Option exercises | 1.6 | 1.0 | 1.7 | 0.3 | 0.1 | 0.0 | | |
| Other cash from financing | 23.1 | 11.6 | 3.5 | 1.5 | 4.2 | 7.2 | | |
| Cash from financing | 92.6 | 58.9 | 65.7 | 49.2 | 61.7 | 7.2 | 28.9 | 5.5 |
| |
| Free cash flow | -34.4 | -91.2 | -34.9 | -10.2 | -15.4 | -9.1 | -38.1 | -28.0 |
| Per share (diluted) | ($0.62) | ($1.92) | ($0.92) | ($0.34) | ($1.38) | ($45.53) | ($0.52) | ($0.44) |
| |
| Cash paid for interest | 2.2 | 0.9 | 0.7 | 0.6 | 0.3 | 0.2 | | |