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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 |

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