| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Mar-31-19 | Dec-31-18 | Mar-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | 10-K | S-1/A |
| Net income | -116.7 | -78.3 | -36.5 | -20.1 | 0.9 | -10.0 | 0.9 | 0.0 |
| Depreciation and amortization [+] | 1.6 | 1.0 | 0.5 | 0.1 | | 0.1 | | 0.1 |
| Depreciation | 1.6 | 1.0 | 0.5 | 0.1 | | 0.1 | | 0.1 |
| Stock-based compensation | 18.9 | 13.3 | 5.0 | 1.3 | | 0.9 | | 0.6 |
| Change in working capital [+] | -2.4 | -4.4 | -1.4 | -1.2 | 1.5 | -0.2 | -0.1 | -0.1 |
| Accounts receivable | -0.3 | -2.4 | -0.8 | -0.1 | | -0.2 | | -0.1 |
| Inventories | -1.3 | -0.4 | -0.1 | 0.0 | | 0.0 | | 0.0 |
| Other current assets | -0.8 | -1.7 | -0.5 | -1.1 | | 0.1 | | -0.1 |
| Other | | | | | 1.5 | | -0.1 | |
| Other operating activities | 3.2 | 6.4 | 3.7 | 2.1 | -2.9 | 1.6 | -1.2 | -6.7 |
| Cash from operations | -95.3 | -62.1 | -28.7 | -17.8 | -0.4 | -7.6 | -0.4 | -6.2 |
| |
| Capital expenditures | -3.3 | -2.7 | -1.8 | -0.2 | 0.0 | 0.0 | 0.0 | -0.1 |
| Purchases of property and equipment | -3.3 | -2.7 | -1.8 | -0.2 | | 0.0 | | -0.1 |
| Purchases of short-term investments, net | -1.0 | -9.8 | -39.5 | | | | -145.2 | |
| Purchases of short-term investments | -31.5 | -48.1 | -41.7 | | | | -145.2 | |
| Sales of short-term investments | 30.5 | 38.3 | 2.2 | | | | | |
| Other cash from investing | | | | | 136.9 | | | |
| Cash from investing | -4.3 | -12.5 | -41.3 | -0.2 | 136.9 | 0.0 | -145.2 | -0.1 |
| |
| Issuance of common stock, net | | | | 19.8 | | | 152.1 | |
| Option exercises | 1.0 | 1.8 | 0.5 | 0.9 | | 0.0 | | 0.0 |
| Financing costs | | | | | | -0.2 | | |
| Other cash from financing | 1.9 | 232.0 | 79.4 | 9.7 | -136.9 | 10.9 | -6.1 | 4.9 |
| Cash from financing | 0.9 | 230.3 | 78.9 | 28.6 | -136.9 | 11.1 | 146.0 | 4.9 |
| |
| Free cash flow | -98.6 | -64.8 | -30.5 | -18.0 | -0.4 | -7.6 | -0.4 | -6.3 |
| Per share (diluted) | ($3.28) | ($2.24) | ($1.80) | ($2.57) | ($0.09) | ($1.73) | ($0.08) | $0.00 |
| |
| Cash paid for interest | 0.0 | 0.0 | 0.0 | | | | | |
| Cash paid for income taxes | | | | | | 0.0 | | 0.0 |