| In millions, except per share items | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Net income | -29.0 | -36.1 | -41.4 | -53.3 | -57.6 | -55.6 | -49.3 | -35.6 |
| Depreciation and amortization | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.0 | 0.0 |
| Stock-based compensation | 5.5 | 5.4 | 5.2 | 5.1 | 4.4 | 3.6 | 3.0 | 2.4 |
| Change in working capital [+] | -3.6 | -6.2 | -9.8 | -7.8 | -2.0 | 0.2 | 2.8 | 2.7 |
| Accounts receivable | -10.4 | -11.1 | -11.8 | -9.8 | -8.3 | -4.2 | 0.0 | |
| Inventories | 0.1 | -1.3 | -1.7 | -1.7 | -1.3 | | | |
| Other current assets | 0.7 | 0.3 | -1.1 | -1.6 | -1.5 | -1.7 | -1.4 | -1.3 |
| Accounts payable | 0.1 | 0.4 | -0.9 | -0.7 | 2.9 | 1.4 | 1.0 | 1.9 |
| Accrued expenses | 3.2 | 3.6 | 2.9 | 3.0 | 3.2 | 2.5 | 2.9 | 0.3 |
| Other | 2.6 | 1.9 | 2.9 | 3.0 | 2.9 | 2.2 | 0.4 | 1.8 |
| Other operating activities | 4.4 | 5.9 | -1.2 | -1.3 | -2.8 | -4.0 | -1.2 | -7.5 |
| Cash from operations | -22.7 | -30.9 | -47.1 | -57.3 | -58.0 | -55.8 | -44.6 | -38.0 |
| |
| Capital expenditures | 0.0 | 0.0 | 0.0 | 0.0 | -0.1 | -0.3 | -0.3 | -0.4 |
| Purchases of property and equipment | | | | | | | | -0.4 |
| Sales of short-term investments, net [+] | 25.1 | 21.1 | -5.3 | -16.9 | 3.8 | -2.4 | | 18.1 |
| Purchases of short-term investments | | -9.0 | -31.2 | -28.2 | -28.1 | -36.2 | | |
| Sales of short-term investments | 34.1 | 30.0 | 25.8 | 11.3 | 31.9 | | | 54.2 |
| Cash from investing | 25.1 | 21.1 | -5.3 | -16.9 | 3.6 | -2.7 | 10.0 | 17.7 |
| |
| Issuance of common stock, net | | | | | | 84.6 | 108.6 | 53.6 |
| Option exercises | 1.1 | 1.1 | | 0.6 | | 0.1 | | 0.0 |
| Financing costs | | | | | | | -0.3 | |
| Other cash from financing | 7.2 | 6.4 | | 28.3 | 22.3 | 2.6 | 23.7 | -1.6 |
| Cash from financing | 6.1 | 5.3 | 4.9 | 82.9 | 83.3 | 87.5 | 132.6 | 52.3 |
| |
| Free cash flow | -22.7 | -30.9 | -47.1 | -57.3 | -58.1 | -56.0 | -44.9 | -38.3 |
| Per share (diluted) | ($0.66) | ($0.90) | ($1.37) | ($1.75) | ($1.90) | ($1.97) | ($1.85) | ($1.79) |
| |
| Cash paid for interest | 4.0 | 3.7 | 3.5 | 2.9 | 2.4 | 1.8 | 1.3 | 1.3 |