| 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 | 8-K | 10-K | 10-Q | 10-Q | 10-Q | 10-K | 10-Q |
| Revenue: | | | | | | | | |
| Revenue | 188.4 | 131.0 | 151.9 | 159.8 | 133.8 | 141.9 | 440.0 | 133.1 |
| Revenue growth | 40.8% | -7.7% | -65.5% | 20.0% | 6.4% | 27.2% | 51.6% | -16.9% |
| Expenses: | | | | | | | | |
| Cost of sales | 2.5 | | 3.7 | 1.5 | 4.7 | 4.2 | 2.2 | 3.1 |
| Research, development and patent | 229.9 | 198.0 | 308.3 | 183.0 | 180.8 | 161.1 | 179.6 | 184.8 |
| Selling, general and administrative | 46.1 | 46.0 | 48.0 | 34.4 | 33.8 | 34.1 | 37.6 | 31.1 |
| Total operating expenses | 278.6 | 246.0 | 359.9 | 218.9 | 219.3 | 199.4 | 219.4 | 218.9 |
| Loss from operations | -90.2 | -114.0 | -208.0 | -59.2 | -85.5 | -57.5 | 220.6 | -85.8 |
| Operating margin | -47.9% | -87.0% | -137.0% | -37.0% | -63.9% | -40.5% | 50.1% | -64.5% |
| |
| Other income (expense): | | | | | | | | |
| Investment income | 20.8 | | 11.9 | 7.5 | 3.4 | 2.0 | 1.8 | 0.9 |
| Interest expense | -2.3 | | -1.7 | -2.1 | -2.1 | -2.1 | -2.2 | -2.3 |
| Interest expense related to sale of future royalties | -17.7 | | | | | | | |
| Gain (loss) on investments | 0.7 | | 3.3 | 2.3 | -6.3 | -6.6 | 5.2 | 4.0 |
| Other income (expense) | 11.2 | 17.0 | 0.6 | 4.7 | -12.3 | 0.2 | -0.5 | -0.5 |
| Loss before income tax expense | -77.4 | | -44.3 | -46.7 | -102.9 | -64.1 | 224.9 | -83.8 |
| Income tax expense | -7.8 | -11.0 | -8.1 | -0.3 | -2.3 | -1.1 | -0.3 | 1.3 |
| Net loss | -85.3 | -124.0 | -52.4 | -47.0 | -105.1 | -65.2 | 224.6 | -82.5 |
| |
| Basic net loss per share (in dollars per share) | ($0.60) | ($0.87) | ($0.37) | ($0.33) | ($0.74) | ($0.46) | $1.60 | ($0.58) |
| Diluted net loss per share (in dollars per share) | ($0.60) | ($0.87) | ($0.37) | ($0.33) | ($0.74) | ($0.46) | $1.60 | ($0.58) |
| |
| Shares used in computing basic net loss per share (in shares) | 143.1 | 143.0 | 141.8 | 142.0 | 141.8 | 141.6 | 141.0 | 141.1 |
| Shares used in computing diluted net loss per share (in shares) | 143.1 | 143.0 | 141.8 | 142.0 | 141.8 | 141.6 | 141.0 | 141.1 |