| In millions, except per share items | Jun-05-23 | Mar-05-23 | Dec-31-22 | Dec-05-22 | Sep-30-22 | Sep-05-22 | Jun-30-22 | Jun-05-22 |
| | 8-K | 8-K | 10-K | 8-K | 10-Q | 8-K | 10-Q | 8-K |
| Revenue | 3.5 | 4.2 | 4.2 | | 6.9 | | | 9.0 |
| Revenue growth | -61.6% | | -54.8% | | -3.5% | | | |
| Cost of revenue | 11.3 | 9.6 | 8.4 | | 7.1 | | | 6.6 |
| Gross profit (loss) | -7.8 | -5.4 | -4.3 | | -0.2 | | | 2.4 |
| Gross margin | -226.4% | -128.4% | -101.5% | | -2.7% | | | 26.6% |
| Research and development expenses | 128.7 | 127.0 | 109.6 | | 105.8 | | | 113.8 |
| General and administrative expenses | 35.9 | 36.9 | 31.1 | | 31.7 | | | 35.0 |
| Selling and marketing expenses | 7.9 | 8.0 | 7.0 | | 7.8 | | | 6.5 |
| Total operating expenses | 286.4 | 285.8 | 147.7 | | 181.4 | | | 253.0 |
| Operating loss | -157.6 | -155.1 | -152.0 | | -139.5 | | | -129.1 |
| Operating margin | -4565.4% | -3691.4% | -3624.9% | | -2028.4% | | | -1436.5% |
| Interest income | 3.9 | | 3.7 | | 2.2 | | | 0.7 |
| Other income (expense), net | 0.0 | | 0.9 | | 0.9 | | | 0.2 |
| Net loss before income taxes | | | -147.3 | | -101.4 | | | |
| Net loss | -115.1 | | -147.3 | | -136.4 | | | -93.3 |
| Unrealized loss on available-for-sale securities | | | -3.1 | | -3.7 | | | |
| Total comprehensive loss | | | -150.4 | | -105.1 | | | |
| |
| Net loss per share, basic | ($0.69) | ($0.69) | ($0.68) | | ($0.63) | | | ($0.59) |
| Net loss per share, diluted | ($0.69) | ($0.69) | ($0.68) | | ($0.63) | | | ($0.59) |
| |
| Weighted-average shares used in computing net loss per share, basic | 219.1 | 218.2 | 217.0 | | 212.9 | | | 215.0 |
| Weighted-average shares used in computing net loss per share, diluted | 219.1 | 218.2 | 163.0 | | 158.9 | | | 215.0 |