| 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 |
| Operating expenses: | | | | | | | | |
| Research and development | 1.0 | 3.5 | 6.4 | 4.6 | 3.2 | 1.9 | 2.8 | 0.8 |
| General and administrative | 1.9 | 1.5 | 2.1 | 1.5 | 1.6 | 2.0 | 1.7 | 1.3 |
| Total operating expenses | 2.9 | 5.0 | 8.5 | 6.1 | 4.9 | 3.9 | 4.5 | 2.1 |
| Loss from operations | -2.9 | -5.0 | -8.5 | -6.1 | -4.9 | -3.9 | -4.5 | -2.1 |
| |
| Other income (expense): | | | | | | | | |
| Change in fair value of financial instruments | 0.6 | 0.0 | 1.2 | 0.1 | 0.9 | 2.0 | 2.4 | 1.0 |
| Other interest expense | 0.0 | | | | | | | |
| Interest expense on convertible debt | | | -0.3 | | -0.1 | -0.1 | -0.4 | |
| Gain on extinguishment of convertible debt and derivative liability | | | | | 1.3 | | | |
| Other income | 0.0 | 0.1 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
| Total other income (expense), net | 0.6 | 0.1 | 1.3 | 0.1 | 2.1 | 1.8 | 2.3 | 0.9 |
| Net loss | -2.3 | -5.0 | -7.3 | -6.0 | -2.7 | -2.1 | -2.2 | -1.2 |
| |
| Other comprehensive loss | | | | | | | | |
| Foreign currency translation adjustment | -0.2 | 0.0 | 0.1 | -0.1 | 0.0 | 0.0 | 0.0 | 0.0 |
| Comprehensive loss | -2.5 | -5.0 | -7.2 | -6.1 | -2.7 | -2.0 | -2.3 | -1.2 |
| |
| Net loss per share, basic | ($0.27) | ($0.58) | ($0.90) | ($0.85) | ($0.38) | ($0.29) | ($0.25) | ($0.20) |
| Net loss per share, diluted | ($0.27) | ($0.58) | ($0.90) | ($0.85) | ($0.38) | ($0.29) | ($0.25) | ($0.20) |
| |
| Weighted-average shares outstanding of common shares, basic | 8.6 | 8.6 | 7.5 | 7.2 | 7.2 | 7.2 | 5.8 | 5.9 |
| Weighted-average shares outstanding of common shares, diluted | 8.6 | 8.6 | 7.5 | 7.2 | 7.2 | 7.2 | 5.8 | 5.9 |