- Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under plan	2,300,000	5,873,103
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award grants vest period first	3 years
Weighted-average grant date fair value of stock options granted	$ 8.85	$ 24.22	$ 36.22
Intrinsic value of stock options exercised		$ 243	$ 12,422
Unrecognized compensation expenses	$ 2,728
Recognized weighted average period	1 year 8 months 12 days
Stock Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards grant term	10 years
Restricted Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock award grants vest period first	1 year
Stock award grants vest period second	3 years
Weighted-average grant date fair value of stock options granted	$ 17.62	$ 66.12	$ 110.34
Recognized weighted average period	1 year 2 months 12 days
Total fair value of restricted common shares and units vested	$ 7,786	$ 9,859	$ 7,418
Unrecognized compensation expenses	$ 5,973
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of stock options granted	$ 10.10	$ 78.41	$ 110.40
Recognized weighted average period	2 years
Total fair value of restricted common shares and units vested	$ 5,243	$ 5,450	$ 8,256
Share-based Payment Arrangement, Cash Used to Settle Award		$ 3,345	$ 13,302
Unrecognized compensation expenses	$ 1,448
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%

Share Based Compensation Arrangement By Share Based Payment Award Terms Of Stock Option Award

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Share Based Compensation Arrangement By Share Based Payment Award Vesting Period Two

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for 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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of award under share-based payment arrangement.

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