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Revenue - Contract costs (Details) - CAD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Capitalized Contract Cost [Line Items]    
Contract costs $ 1,016,000 $ 2,308,000
Reimbursable bid costs    
Capitalized Contract Cost [Line Items]    
Contract costs 0 670,000
Capitalized costs 0 248,000
Fulfillment costs    
Capitalized Contract Cost [Line Items]    
Contract costs 1,016,000 1,638,000
Capitalized costs $ 1,016,000 $ 2,611,000