| In millions, except per share items | Dec-31-22 | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 |
| | 10-K | 10-K | 10-K | 10-K | 10-K |
| Revenue | 269.7 | 380.2 | 229.0 | 119.9 | 50.8 |
| Revenue growth | -29.1% | 66.0% | 91.1% | 136.1% | |
| Costs and expenses: | | | | | |
| Cost of revenue | 30.7 | 25.2 | 12.3 | 5.7 | 2.1 |
| Research and development | 52.3 | 46.2 | 23.2 | 11.2 | 7.5 |
| Sales and marketing | 277.0 | 466.7 | 254.3 | 111.4 | 51.7 |
| General and administrative | 163.0 | 135.8 | 42.5 | 16.4 | 15.0 |
| Total costs and expenses | 691.1 | 674.0 | 332.2 | 144.7 | 76.3 |
| Loss from operations | -421.4 | -293.8 | -103.2 | -24.8 | -25.5 |
| Operating margin | -156.2% | -77.3% | -45.1% | -20.7% | -50.3% |
| Interest expense, net | -24.0 | -1.2 | -1.3 | -2.5 | -2.2 |
| Change in fair value of common stock warrant liabilities | 6.0 | 87.9 | -23.0 | | |
| Other income (expense), net | 0.1 | 0.0 | -21.4 | 3.7 | 0.0 |
| Loss before income taxes | -439.2 | -207.1 | -149.0 | -23.6 | -27.8 |
| Provision for (benefit from) income taxes | -0.3 | -19.1 | 0.1 | | |
| Net loss | -438.9 | -187.9 | -149.1 | -23.6 | -27.8 |
| |
| Net loss per share attributable to common stockholders: | | | | | |
| Basic (in dollars per share) | ($1.07) | ($0.49) | ($0.51) | ($0.09) | ($0.12) |
| Diluted (in dollars per share) | ($1.07) | ($0.71) | ($0.51) | ($0.09) | |
| |
| Weighted average shares outstanding: | | | | | |
| Basic (in shares) | 410.0 | 384.6 | 294.5 | 261.2 | 236.0 |
| Diluted (in shares) | 410.0 | 388.5 | 294.5 | 261.2 | 236.0 |
| |
| Other comprehensive income (loss): | | | | | |
| Change in unrealized loss on available-for-sale investments, net of tax | -1.3 | -0.2 | | | |
| Total other comprehensive income (loss): | -1.3 | -0.2 | | | |
| Total comprehensive loss | -440.2 | -188.2 | -149.1 | -23.6 | |