Income Tax - Reconciliation of Income Tax Attributable to Operations (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
|
| Income Tax Disclosure [Abstract] | |||
| Income tax recovery at statutory rates (at a rate of 21% for all years presented) | $ (6,962) | $ (3,094) | $ (3,490) |
| Expenses not deducted for tax purposes | 224 | 118 | 116 |
| Effect of tax rate changes on deferred tax assets and liabilities | 17 | 34 | (13) |
| Rate differential on foreign earnings | (77) | (103) | (296) |
| Investment tax credits | (134) | (23) | (84) |
| Change in valuation allowance | 7,544 | 3,662 | (3,246) |
| Reassessment of previously recognized net operating losses | (620) | 7,192 | |
| Reversal of previously accrued taxes due to IRS reassessment | (221) | ||
| Other | $ 8 | $ (594) | (179) |
| Income tax expense/(recovery) | $ (221) | ||