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Stock-Based Compensation - Black-Scholes-Merton Option Pricing Model for Stock Options Granted (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement [Abstract]
Expected dividend yield	0.00%	0.00%	0.00%
Weighted average expected volatility	51.00%	58.00%	58.00%
Weighted average expected term (years)	6 years 25 days	5 years 11 months 12 days	5 years 10 months 24 days
Weighted average risk-free rate	1.14%	2.26%	2.68%

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-Publisher FASB
-Name Accounting Standards Codification
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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-Publisher FASB
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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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