| 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 |
| Revenue | 28.0 | 18.3 | 44.2 | 23.8 | 16.3 | 17.0 | 28.4 | 18.9 |
| Revenue growth | 71.8% | 7.9% | 55.6% | 25.8% | -3.6% | 74.1% | | 122.1% |
| Cost of revenue | 41.8 | 37.9 | 57.0 | 49.1 | 39.5 | 40.4 | 57.1 | 51.8 |
| Gross loss | -13.8 | | | | -23.2 | | | |
| Gross margin | -49.1% | | | | -142.3% | | | |
| |
| Operating expenses: | | | | | | | | |
| Research and development | 9.7 | 12.9 | 14.2 | 15.6 | 20.9 | 19.7 | 19.6 | 36.3 |
| Selling, general, and administrative | 23.5 | 25.4 | 34.8 | 41.2 | 40.8 | 43.0 | 36.7 | 38.2 |
| |
| Impairment of note receivable | | | | | | | | |
| Restructuring costs (Note 11) | 1.3 | 4.2 | | | | | | |
| Total operating expenses | 114.8 | 82.8 | 132.0 | 105.9 | 162.9 | 103.2 | 113.3 | 126.4 |
| Loss from operations | -52.3 | -64.5 | -87.8 | -82.1 | -84.9 | -86.2 | -84.9 | -107.5 |
| Operating margin | -186.4% | -351.3% | -198.4% | -345.5% | -520.2% | -506.7% | -298.6% | -569.1% |
| |
| Interest and other expense (income), net: | | | | | | | | |
| Interest expense, net | 4.0 | 3.2 | 2.6 | 0.1 | 0.1 | 0.2 | 0.0 | 0.3 |
| Other expense (income), net | 0.1 | 0.2 | 0.1 | 0.1 | -0.2 | 0.3 | 0.0 | -0.1 |
| Gain on fair value change, net | 0.0 | -0.5 | -0.8 | -0.2 | -1.9 | -4.4 | -5.9 | -13.1 |
| Interest and other expense (income), net | 4.1 | 2.8 | 1.9 | 0.1 | -2.0 | -3.9 | -5.8 | -12.9 |
| Loss before provision for income taxes | -56.3 | -67.3 | -89.7 | -82.0 | -82.9 | -82.3 | -79.0 | -94.6 |
| Provision for income taxes | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | -0.4 |
| Net loss | -56.4 | -67.3 | -89.8 | -82.1 | -82.9 | -82.4 | -79.1 | -94.2 |
| Comprehensive loss | -56.4 | -67.3 | -89.8 | -82.1 | -82.9 | -82.4 | -79.1 | -94.2 |
| |
| Net loss per share, basic (in shares) | ($14.11) | ($0.28) | ($0.41) | ($0.38) | ($23.21) | ($0.38) | ($0.33) | ($0.44) |
| Net loss per share, diluted (in shares) | ($14.11) | ($0.28) | ($0.41) | ($0.38) | ($23.21) | ($0.38) | ($0.33) | ($0.44) |
| |
| Weighted-average shares used in calculation of net loss per share, diluted | 4.0 | 236.3 | 215.6 | 214.8 | 3.6 | 214.2 | 173.7 | 212.2 |
| Weighted-average shares used in calculation of net loss per share, basic | 4.0 | 236.3 | 215.6 | 214.8 | 3.6 | 214.2 | 173.7 | 212.2 |