| In millions, except per share items | Jun-30-23 | Mar-31-23 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 |
| | 10-Q | 10-Q | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q |
| Royalty revenue | 0.3 | | 0.5 | | | 0.0 | 1.9 | 0.4 |
| Royalty revenue growth | | | -72.8% | -100.0% | -100.0% | -99.7% | 36.1% | -84.8% |
| Operating costs and expenses: | | | | | | | | |
| Research and development | 1.6 | 1.0 | 1.3 | 1.1 | 0.8 | 1.0 | 1.4 | 0.7 |
| Selling, general and administrative | 2.7 | 4.3 | 5.3 | 4.0 | 4.1 | 6.0 | 8.6 | 8.7 |
| Impairment of property and equipment | | | | 4.9 | | | | |
| Total operating costs and expenses | 4.2 | 5.3 | 7.1 | 10.0 | 4.9 | 8.2 | 10.5 | 10.5 |
| |
| Loss from operations | | | | | | | | |
| Other income (expense): | | | | | | | | |
| Interest expense | 0.0 | -0.1 | -0.2 | -0.3 | -0.4 | -0.5 | -0.5 | -0.6 |
| Interest income and other (expense) income, net | -0.4 | -5.5 | -0.1 | -0.1 | 0.0 | 0.0 | 0.0 | 0.0 |
| Non-cash interest income on liability related to the sale of future royalties | | | | 0.5 | | | | |
| Gain on extinguishment of liability related to the sale of future royalties | | | | 84.1 | | | | |
| Total other income (expense) | -0.5 | 5.4 | -0.1 | 84.3 | 0.3 | 0.3 | 0.3 | 0.2 |
| |
| Net income (loss) before income taxes | | | | | | | | |
| Provision for income taxes | 0.0 | 8.2 | 0.0 | 0.0 | 4.1 | | | 0.0 |
| Net income (loss) from continuing operations | -4.4 | 0.1 | | 74.3 | -4.6 | | | |
| Net income (loss) from discontinued operations – See Note 3 | 0.1 | -8.2 | | -3.7 | -4.1 | | | |
| Net income (loss) | -4.4 | -8.2 | -6.8 | 70.7 | -8.7 | -7.9 | -8.4 | -9.9 |
| Income allocated to participating securities | | | | -7.5 | | | | |
| |
| Net income (loss) attributable to Common Shareholders, basic | ($0.40) | ($0.75) | ($0.94) | $8.58 | ($1.19) | ($0.06) | ($1.40) | ($0.08) |
| Net income (loss) attributable to Common Shareholders, diluted | -4.4 | | -6.9 | 63.2 | | | -8.4 | |
| |
| Basic earnings (loss) per share | | | | | | | | |
| Income (loss) from continuing operations (in dollars per share) | 0.0 | | | 0.0 | 0.0 | | | |
| Income (loss) from discontinued operations (in dollars per share) | 0.0 | 0.0 | | 0.0 | 0.0 | | | |
| Net income (loss) per share (in dollars per share) | ($0.40) | ($0.75) | ($0.94) | $8.58 | ($1.19) | ($0.06) | ($1.40) | ($0.08) |
| |
| Diluted earnings (loss) per share | | | | | | | | |
| Income (loss) from continuing operations (in dollars per share) | 0.0 | | | 0.0 | | | | |
| Income (loss) from discontinued operations (in dollars per share) | 0.0 | 0.0 | | 0.0 | 0.0 | | | |
| Net income (loss) per share (in dollars per share) | ($0.40) | ($0.75) | ($0.94) | $8.58 | ($1.19) | ($0.06) | ($1.40) | ($0.08) |
| |
| Shares used in computing net income | 10.9 | 10.9 | 7.4 | 7.4 | 7.3 | 119.9 | 6.0 | 119.1 |
| Shares used in computing net income | 10.9 | 10.9 | 7.4 | 7.4 | 7.3 | 119.9 | 6.0 | 119.1 |