Senior Facility - Schedule of Interest Expenses Recognized Related to Senior Facility (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Contractual interest at Canadian prime plus 8.05%	$ 1,643		$ 5,669
Amortization of discount on convertible notes	10,317	$ 9,843	$ 2,180
Senior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Contractual interest at Canadian prime plus 8.05%	4,257
Amortization of discount on convertible notes	1,372
Total	$ 5,629

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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