Income Taxes - Summary of Expiry Details of Investment Tax Credits, Non-Capital Losses and Net Operating Losses for Income Tax Purposes (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	$ 15,807	$ 11,700
Non-capital losses	457,606
Tax Year 2029
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	1,169
Non-capital losses	0
Tax Year 2030
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	1,242
Non-capital losses	0
Tax Year 2031
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	1,758
Non-capital losses	0
Tax Year 2032
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	0
Non-capital losses	0
Tax Year 2033
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	0
Non-capital losses	0
Tax Year 2034
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	229
Non-capital losses	0
Tax Year 2035
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	1,068
Non-capital losses	3,961
Tax Year 2036
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	862
Non-capital losses	24,578
Tax Year 2037
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	1,587
Non-capital losses	10,625
Tax Year 2038
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	1,485
Non-capital losses	0
Tax Year 2039
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	1,818
Non-capital losses	81,253
Tax Year 2040
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	1,903
Non-capital losses	146,611
Tax Year 2041
Summary Of Tax Credit Carry Forward And Operating Loss Carry Forwards [Line Items]
Investment tax credits	2,686
Non-capital losses	$ 190,578