| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Net income | -59.0 | -95.5 | -45.0 | -43.3 | -23.8 | -16.9 |
| Depreciation and amortization | 1.0 | 1.0 | 1.1 | 0.8 | 0.5 | 0.4 |
| Stock-based compensation | 29.0 | 21.2 | 11.1 | 3.5 | 1.0 | 0.3 |
| Change in working capital [+] | -72.8 | -11.4 | -13.7 | -1.1 | 98.6 | 0.6 |
| Accounts receivable | 1.9 | 5.0 | -3.8 | -3.5 | | |
| Other current assets | -5.5 | -4.0 | -0.8 | -1.9 | -0.7 | |
| Accounts payable | -1.6 | 1.0 | -1.1 | 3.2 | 0.9 | 0.3 |
| Accrued expenses | 0.1 | 1.5 | 3.5 | 3.4 | 1.9 | |
| Deferred revenues | -67.6 | -14.8 | -11.5 | -2.2 | 96.6 | |
| Other | | | -0.1 | -0.1 | 0.0 | 0.3 |
| Other operating activities | 0.8 | 1.3 | 0.5 | -1.6 | 0.0 | 0.2 |
| Cash from operations | -101.0 | -83.5 | -46.0 | -41.7 | 76.3 | -15.4 |
| |
| Capital expenditures [+] | -0.4 | -1.0 | -0.5 | -2.2 | -0.7 | -0.9 |
| Purchases of property and equipment | -0.4 | -1.0 | -0.5 | -2.2 | -0.7 | -0.9 |
| Sales of property and equipment | | | | | 0.0 | |
| Purchases of short-term investments, net | -63.2 | -112.2 | 8.7 | -133.8 | | |
| Purchases of short-term investments | -238.3 | -244.2 | -145.3 | -296.3 | | |
| Sales of short-term investments | 175.0 | 132.0 | 154.0 | 162.5 | | |
| Other cash from investing | 7.1 | | | | | 0.0 |
| Cash from investing | -56.5 | -113.2 | 8.2 | -136.0 | -0.7 | -0.9 |
| |
| Issuance of common stock, net | | | | 93.3 | | |
| Option exercises | 5.2 | 9.5 | 3.5 | 0.0 | | |
| Other cash from financing | 50.4 | 275.8 | 41.8 | 0.1 | 89.5 | 20.3 |
| Cash from financing | 45.3 | 266.3 | 38.3 | 93.3 | 89.5 | 20.3 |
| |
| Free cash flow | -101.3 | -84.5 | -46.5 | -43.8 | 75.7 | -16.4 |
| Per share (diluted) | ($2.66) | ($2.36) | ($1.52) | ($2.72) | $70.74 | ($16,360.00) |
| |
| Cash paid for interest | | | | | 0.1 | |
| Cash paid for income taxes | 0.1 | 0.2 | 0.5 | 0.6 | | |