| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenues | 0.8 | 0.2 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Revenues growth | 8150.0% | 1550.0% | 646.3% | -6.7% | -63.0% | -45.5% | -161.2% | -102.0% |
| Cost of revenues | 0.8 | 0.2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Gross margin | 0.1 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | | 0.0 |
| Gross margin | 7.9% | 17.2% | 22.2% | 57.1% | 20.0% | 8.3% | | -6.7% |
| |
| Operating costs and expenses: | | | | | | | | |
| Selling, general and administrative | 42.3 | 44.6 | | | 17.5 | 22.0 | | |
| Research and development | 46.0 | 77.0 | 133.4 | 117.9 | 71.2 | 101.5 | 115.0 | 99.3 |
| Total operating costs and expenses | 88.2 | 290.3 | 178.2 | 140.0 | 88.7 | 123.5 | 133.4 | 109.6 |
| Loss from operations | -88.2 | -121.6 | -178.1 | -140.0 | -88.7 | -123.5 | -133.4 | -109.6 |
| Operating margin | -10689.0% | -61420.7% | -58214.4% | -999850.0% | -886790.0% | -1028758.3% | -325451.2% | -730433.3% |
| |
| Other income (expense): | | | | | | | | |
| Other income (expense), net | -0.3 | 0.0 | 0.4 | 0.3 | -0.5 | -0.4 | -0.3 | -0.1 |
| Interest income | 6.6 | 6.9 | 5.7 | 3.1 | 1.4 | 0.3 | 0.2 | 0.2 |
| Interest expense | -4.6 | -4.6 | -4.6 | -4.7 | -4.8 | -4.4 | -4.4 | -2.1 |
| Foreign currency gain (loss) | 3.8 | -0.4 | 7.9 | -7.3 | -3.4 | 0.7 | -0.5 | 1.8 |
| Unrealized gain (loss) recognized on equity securities | 0.3 | -0.7 | | | -10.0 | 5.1 | | |
| Total other income (expense) | 5.9 | 1.1 | 8.2 | -9.4 | -17.3 | 1.4 | -5.0 | 1.4 |
| Loss before income taxes | -82.3 | -120.5 | -547.3 | | -106.0 | -122.1 | -471.3 | |
| Provision for income taxes | -0.3 | -0.1 | | | | | | |
| Net loss | -82.6 | -120.6 | -170.1 | -149.3 | -106.0 | -122.1 | -138.4 | -109.8 |
| |
| Net loss per common share | | | | | | | | |
| Net loss per share attributable to Class A and Class B Common stock- Basic | ($0.25) | ($0.38) | ($0.54) | ($0.49) | ($0.36) | ($0.41) | ($0.46) | ($0.37) |
| Net loss per share attributable to Class A and Class B Common stock - Diluted | ($0.25) | ($0.38) | ($0.54) | ($0.49) | ($0.36) | ($0.41) | ($0.46) | ($0.37) |
| |
| Weighted average shares outstanding | | | | | | | | |
| Weighted average Class A and Class B Common shares outstanding- Basic | 335.9 | 321.0 | 303.4 | 303.2 | 298.3 | 296.5 | 292.0 | 296.1 |
| Weighted average Class A and Class B Common shares outstanding- Diluted | 335.9 | 321.0 | 303.4 | 303.2 | 298.3 | 296.5 | 292.0 | 296.1 |