| In millions, except per share items | Jun-30-23 | Dec-31-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 |
| | 10-Q | 8-K | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q |
| Net income | | | -156.7 | -168.2 | -181.0 | -155.7 | -147.6 | -100.6 |
| Depreciation and amortization [+] | | | 2.8 | 2.7 | 2.7 | 2.4 | 2.4 | |
| Depreciation | | | 1.6 | 1.5 | 1.5 | 1.5 | 1.3 | 0.7 |
| Amortization of intangible assets | | | | | 0.5 | 0.5 | | |
| Stock-based compensation | | | 25.7 | 23.4 | 24.2 | | 33.0 | |
| Change in working capital [+] | | | -23.6 | -18.9 | -10.6 | | -7.2 | |
| Accounts receivable | | | -8.4 | -13.8 | -10.0 | | -5.1 | |
| Inventories | | | -8.2 | -8.7 | -3.7 | | -17.4 | |
| Other | | | -7.0 | 3.6 | 3.2 | | 15.2 | |
| Other operating activities | | | 1.8 | 0.9 | -2.3 | | -42.0 | |
| Cash from operations | | | -150.1 | -160.2 | -167.0 | -137.9 | -161.4 | |
| |
| Capital expenditures [+] | | | -0.2 | -0.3 | -1.4 | -3.7 | -8.7 | |
| Capitalized product costs | | | -0.2 | -0.3 | -1.4 | | -8.7 | -8.5 |
| Purchases of intangible assets | | | | | 0.0 | | 0.0 | 0.0 |
| Purchases of short-term investments, net | | | -12.7 | -56.5 | -57.8 | | -203.2 | -205.1 |
| Purchases of short-term investments | | | -329.1 | -361.5 | -313.1 | | -419.9 | -318.1 |
| Sales of short-term investments | | | 316.4 | 305.0 | 255.3 | | 216.8 | 113.0 |
| Cash from investing | | | -12.9 | -56.8 | -71.1 | -46.4 | -223.8 | |
| |
| Issuance of common stock, net | | | | | 196.7 | | | |
| Option exercises | | | 10.4 | 10.3 | 14.9 | | 12.9 | 11.6 |
| Other cash from financing | | | 21.1 | 21.0 | 30.2 | | 25.9 | |
| Cash from financing | | | 207.5 | 207.4 | 212.0 | 7.6 | 200.7 | |
| |
| Free cash flow | | | -150.1 | -160.2 | -167.0 | -137.9 | -161.4 | |
| Per share (diluted) | | | ($1.11) | ($1.22) | ($1.31) | ($1.13) | ($1.37) | |
| |
| Cash paid for income taxes | | | -0.8 | | -0.3 | | -0.5 | |