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Convertible Senior Notes - Schedule of Interest Expense Related to Notes (Detail) - Convertible Senior Notes $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Contractual interest expense	$ 271
Amortization of debt discount	1,452
Amortization of issuance costs allocated to debt	91
Total interest expense	$ 1,814

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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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