Income Tax - Summary of Tax Effects of Temporary Differences and Carryforwards Rise to Deferred Tax Assets and Liabilities (Detail) - USD ($) |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Deferred tax assets | ||
| Tax basis in excess of book value of assets | $ 897,000 | $ 892,000 |
| Non-capital loss carryforwards | 39,356,000 | 35,596,000 |
| Research and development deductions and credits | 7,058,000 | 7,010,000 |
| §59(e) Capitalized R&D expenses | 7,159,000 | 3,757,000 |
| Other | 1,018,000 | 813,000 |
| Total deferred tax assets | 55,488,000 | 48,068,000 |
| Valuation allowance | (55,082,000) | (47,539,000) |
| Net deferred assets | 406,000 | 529,000 |
| Deferred tax liabilities | ||
| Other | (406,000) | (529,000) |
| Total deferred tax liabilities | (406,000) | $ (529,000) |
| Net deferred tax assets | $ 0 |