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Financial Instruments- Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
CAD ($)
Customers
Dec. 31, 2018
USD ($)
Customers
Dec. 31, 2017
USD ($)
Customers
Disclosure of detailed information about financial instruments [line items]      
Transfers of assets or liabilities between levels   $ 0 $ 0
Outstanding letters of credit $ 38,000 $ 261,000  
Interest rate risk [member]      
Disclosure of detailed information about financial instruments [line items]      
Higher in risk assumption 0.50% 0.50%  
Loss for the year would have been higher in risk assumption   $ 182,000 $ 201,000
LIBOR measurement period 90 days 90 days  
Currency risk [member]      
Disclosure of detailed information about financial instruments [line items]      
Foreign currency exchange rate for canadian dollar 1.00 1.00  
Foreign currency exchange rate for us dollar 0.7336 0.7336 0.7966
Increase decrease in foreign currency exchange rate $ 0.10    
Less than 30 days [member]      
Disclosure of detailed information about financial instruments [line items]      
Percentage of trade receivables outstanding balance 90.30% 90.30% 89.40%
Between 30 and 90 days [member]      
Disclosure of detailed information about financial instruments [line items]      
Percentage of trade receivables outstanding balance 8.30% 8.30% 7.40%
More than 90 days [member]      
Disclosure of detailed information about financial instruments [line items]      
Percentage of trade receivables outstanding balance 1.40% 1.40% 3.20%
Maximum [member]      
Disclosure of detailed information about financial instruments [line items]      
Operating credit facility $ 13,000,000    
Customer one [member]      
Disclosure of detailed information about financial instruments [line items]      
Percentage of balance of trade receivables 13.80% 13.80% 16.00%
Customer two [member]      
Disclosure of detailed information about financial instruments [line items]      
Percentage of balance of trade receivables 11.50% 11.50% 14.80%
Trade receivables [member]      
Disclosure of detailed information about financial instruments [line items]      
Number of customers with benchmark contribution of more than 10% | Customers 2 2 2