Stock-based Compensation - Summary of Restricted Stock Activity (Detail) - Restricted Stock - USD ($) $ / shares in Units, $ in Thousands	5 Months Ended	7 Months Ended	12 Months Ended
Dec. 31, 2018	Aug. 13, 2018	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning Balance, Number of Shares, Outstanding (in shares)			1,092,309
Number of shares, Granted (in shares)			514,258
Number of shares, Vested (in shares)			(484,647)
Number of share, Forfeitures (in shares)			(83,914)
Ending Balance, Number of Shares, Outstanding (in shares)			1,038,006	1,092,309
Beginning Balance, Weighted Average Grant Price, Outstanding (in dollars per share)			$ 6.11
Weighted Average Grant Price, Granted (in dollars per share)	$ 8.70	$ 8.51	5.38	$ 5.40
Weighted Average Grant Price, Vested (in dollars per share)			6.11
Weighted Average Grant Price, Forfeitures (in dollars per share)			5.43
Ending Balance, Weighted Average Grant Price, Outstanding (in dollars per share)			$ 5.80	$ 6.11
Fair value of vested restricted stock	$ 3,541	$ 2,676	$ 2,852	$ 925
Per share weighted average fair value (in dollars per share)	$ 8.70	$ 8.51	$ 5.38	$ 5.40
Compensation expense recognized for restricted stock grants	$ 451	$ 2,262	$ 3,247	$ 2,121
Unrecognized compensation expense related to unvested shares			$ 4,564
Expected recognition period			1 year 9 months 18 days

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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