Senior Facility - Schedule of Interest Expenses Recognized Related to Senior Facility (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Amortization of discount on convertible notes		$ 7,944	$ 7,616
Senior Secured Term Loan Facility [Member]
Debt Instrument [Line Items]
Contractual interest at Canadian prime plus 8.05%	$ 1,260	2,970
Amortization of discount on convertible notes	407	943
Total	$ 1,667	$ 3,913

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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