| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 | Dec-31-18 | Dec-31-17 |
| | 10-K | 10-K | 10-K | 10-K/A | S-1/A |
| Assets | | | | | |
| Current assets | | | | | |
| Cash and cash equivalents | 114.1 | 72.3 | 119.8 | 85.9 | |
| Short-term investments | | 70.0 | | 0.0 | |
| Research and development tax credits receivable | 0.4 | 0.7 | 0.6 | 0.3 | |
| Prepaid expenses | 4.3 | 5.4 | 1.8 | 1.4 | |
| Other receivables | 0.1 | 0.2 | 0.3 | 0.4 | |
| Total current assets | 118.9 | 148.7 | 122.5 | 88.1 | |
| Operating lease assets | 0.7 | 1.0 | | | |
| Property and equipment | 0.2 | 0.3 | 0.4 | 0.0 | |
| Total assets | 119.8 | 150.0 | 123.4 | 88.1 | |
| |
| Liabilities, and Shareholders' Equity | | | | | |
| Liabilities | | | | | |
| Current liabilities | | | | | |
| Accounts payable and accrued liabilities | 6.6 | 5.9 | 8.0 | 4.5 | |
| Operating lease liabilities | 0.2 | 0.2 | 0.2 | | |
| Total current liabilities | 6.8 | 6.2 | 8.3 | 4.5 | |
| Total liabilities | 7.2 | 6.9 | 8.5 | 4.5 | |
| |
| Shareholders' Equity | | | | | |
| Common shares | 251.9 | 251.7 | 226.2 | 2.0 | |
| Pre-funded warrants - 9,577,257 issued and outstanding as of June 30, 2023 and 8,518,257 as of December 31, 2022 | 52.9 | 48.0 | | | |
| Additional paid-in capital | 15.7 | 8.5 | 3.8 | 2.7 | |
| Accumulated deficit | -206.3 | -163.5 | -113.5 | -58.3 | |
| Total shareholders' equity | 112.6 | 143.1 | 114.9 | 83.5 | |
| Total liabilities and shareholders' equity | 119.8 | 150.0 | 123.4 | 88.1 | |