The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Description of the likelihood that an uncertainty in income taxes will not be sustained as a result of the examination by the taxing authority.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Summary Of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Significant Accounting Policies [Line Items]
Number of reportable segments \| Segment	3
Stock options vesting period	3 years
Stock options period of expiry	10 years
Description of uncertain position	The first step is recognition, where the Company evaluates whether an individual tax position has a likelihood of greater than 50% of being sustained upon examination based on the technical merits of the position, including resolution of any related appeals or litigation processes. For tax positions that are currently estimated to have a less than 50% likelihood of being sustained, zero tax benefit is recorded.
Maximum [Member]
Significant Accounting Policies [Line Items]
Percentage of tax position likely to be sustained	50.00%
Minimum [Member]
Significant Accounting Policies [Line Items]
Percentage of tax position likely to be sustained	50.00%
Share-based Payment Arrangement, Tranche One [Member]
Significant Accounting Policies [Line Items]
Stock options vesting percentage	33.00%
Share-based Payment Arrangement, Tranche Two [Member]
Significant Accounting Policies [Line Items]
Stock options vesting percentage	33.00%
Share-based Payment Arrangement, Tranche Three [Member]
Significant Accounting Policies [Line Items]
Stock options vesting percentage	33.00%
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Significant Accounting Policies [Line Items]
Impairment charge \| $	$ 0	$ 0	$ 0