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Unrecognized compensation expense.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The highest quantity of shares an employee can purchase under the plan per period.

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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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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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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Number of grantees affected by modification of award under share-based payment arrangement.

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

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of options vested.

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Purchase price of common stock expressed as a percentage of its fair value.

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Per share or per unit amount of equity securities issued.

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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 17, 2021 USD ($)	Aug. 04, 2021 shares	Nov. 30, 2020 Employees $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Sep. 22, 2021 $ / shares	Dec. 31, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense \| $				$ 25,582	$ 570	$ 27,236	$ 1,756
Amended 2015 Long Term Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award options to senior executives and directors contingently vestable				3,215,432		3,215,432
2021 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized pre-tax non-cash share-based compensation expense \| $						$ 79,700
Weighted average period						4 years
2021 Omnibus Incentive Plan [Member] \| Stock Shares Issued to Employees Consideration in the Form of Promissory Note [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation expense \| $	$ 7,700							$ 800
Stock issued during the period shares to employees during the period								370,182
Shares issued price per share \| $ / shares								$ 9.68
Related party transaction rate of interest								0.39%
2021 Omnibus Incentive Plan [Member] \| Performance-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award non vested options outstanding				3,096,830		3,096,830
Share based compensation by share based award weighted average fair value of options granted during the period \| $ / shares						$ 0	$ 2.21
Share based compensation by share based award plan modification number of options subject to modification			1,483,124
2021 Omnibus Incentive Plan [Member] \| Service-Based Vesting Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award non vested options outstanding				6,450,978		6,450,978
Share based compensation by share based award weighted average fair value of options granted during the period \| $ / shares						$ 2.32	$ 2.21
Share based compensation by share based award plan modification number of options subject to modification			4,109,140
2021 Omnibus Incentive Plan [Member] \| Service-Based Vesting Stock Options [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting term						5 years
2021 Omnibus Incentive Plan [Member] \| Service-Based Vesting Stock Options [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						60.00%
2021 Omnibus Incentive Plan [Member] \| Service-Based Vesting Stock Options [Member] \| Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						20.00%
2021 Omnibus Incentive Plan [Member] \| Service-Based Vesting Stock Options And Performance-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award plan modification revised exercise price \| $ / shares			$ 9.68
Share based compensation by share based award plan modification number of employees affected \| Employees			51
2021 Omnibus Incentive Plan [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award number of shares available for grant				44,211		44,211
Share based compensation by share based award vesting percentage						50.00%
Weighted average price of shares purchased \| $ / shares									$ 23.00
Share-based payment arrangement, nonvested award, cost not yet recognized, amount \| $				$ 1,000		$ 1,000
2021 Omnibus Incentive Plan [Member] \| Restricted Stock Units [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						25.00%
2021 Omnibus Incentive Plan [Member] \| Restricted Stock Units [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						25.00%
2021 Omnibus Incentive Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award number of shares available for grant				1,824,597		1,824,597
Share based compensation by share based award vesting percentage						50.00%
Weighted average price of shares purchased \| $ / shares				$ 23.00		$ 23.00
Share-based payment arrangement, nonvested award, cost not yet recognized, amount \| $				$ 41,700		$ 41,700
2021 Omnibus Incentive Plan [Member] \| Restricted Stock [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						25.00%
2021 Omnibus Incentive Plan [Member] \| Restricted Stock [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						25.00%
2021 Omnibus Incentive Plan [Member] \| NQSO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, nonvested award, cost not yet recognized, amount \| $				$ 36,900		$ 36,900
2021 Omnibus Incentive Plan [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award number of shares available for grant				3,627,441		3,627,441
Weighted average price of shares purchased \| $ / shares				$ 23.00		$ 23.00
Share-based compensation arrangement by share-based payment award, options, vested, weighted average grant date fair value \| $ / shares				$ 10.24		$ 10.24
2021 Omnibus Incentive Plan [Member] \| Stock Options [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						50.00%
2021 Omnibus Incentive Plan [Member] \| Stock Options [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						25.00%
2021 Omnibus Incentive Plan [Member] \| Stock Options [Member] \| Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award vesting percentage						25.00%
2021 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award number of shares authorized for issuance				1,886,000		1,886,000
Share-based compensation arrangement by share-based payment award, shares issued in period						11,319,000
Percentage of outstanding stock maximum						1.00%
Share-based compensation arrangement by share-based payment award, maximum employee subscription rate		15.00%
Share-based compensation arrangement by share-based payment award, maximum number of shares per employee				0		0
2021 Employee Stock Purchase Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share based payment award purchase Price of common stock percent		85.00%
2015 Long-Term Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award number of shares available for grant				7,068,200		7,068,200
Share based compensation by share based award expiration term						10 years
Unrecognized compensation expense \| $						$ 14,900
2015 Long-Term Equity Incentive Plan [Member] \| After Six Months From Effectiveness Of Registration Statement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum threshold percentage transfer of long term option shares		25.00%
2015 Long-Term Equity Incentive Plan [Member] \| On Or After The First Anniversary To Second Anniversary Of The Effectiveness Of Registration Statement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum threshold percentage transfer of long term option shares		50.00%
2015 Long-Term Equity Incentive Plan [Member] \| Performance-Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award non vested options outstanding				3,096,830	3,120,790	3,096,830	3,120,790	3,120,790		3,036,930
2015 Long-Term Equity Incentive Plan [Member] \| Service-Based Vesting Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award non vested options outstanding				6,450,978	5,650,691	6,450,978	5,650,691	6,289,248		5,374,486
Share based compensation by share based award aggregate intrinsic value of stock options exercised \| $						$ 141	$ 356
2021 Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation by share based award number of shares available for grant		9,433,000
Share-based compensation arrangement by share-based payment award, shares issued in period		9,433,000				3,936,751
Percentage of outstanding stock maximum		5.00%