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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