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Fair Value Measurements - Additional Information (Detail) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 CAD ($)
Derivative [Line Items] |  |  |
Significant transfers from level 1 to level 2 | $ 0 | $ 0 |
Significant transfers from level 2 to level 1 | 0 | $ 0 |
Foreign currency transaction gain (loss), unrealized | 0 |  |
Foreign currency transaction gain (loss), realized | 0 |  |
Foreign Exchange Forward | United States of America, Dollars |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount | $ 0 |  |
Foreign Exchange Forward | Canada, Dollars |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount |  |  | $ 24,000,000

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