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Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax [Line Items]      
Income (loss) before income taxes $ 8,818 $ (3,541) $ (9,815)
Tax (recovery) calculated at US domestic tax rates 1,869 (744) (2,061)
State tax adjustments (310) (350)  
Non-deductible items (6,531) 1,304 394
True up of prior year income tax estimates (181) 207 (206)
Capitalized debt amortization costs   (631)  
Share of (income) losses from joint venture (228) (4,367) (75)
Unrealized foreign exchange   (276) (309)
Deferred adjustment 343 (1,920)  
Differences attributed to joint venture capital transactions   (487)  
Tax rate differences on deferred items 49 (42) (56)
Change in tax rates 37    
Change in valuation allowance 3 (144)  
Other 516 112 (79)
Provision For (Recovery Of) Income Taxes (2,790) (5,866) (2,300)
Canadian [Member]      
Income Tax [Line Items]      
Differences in Canadian tax rates 1,643 1,472 92
Provision For (Recovery Of) Income Taxes $ 2,263 $ 799 $ (335)