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Plan's Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Benefit Obligation	$ 385	$ 326
Fair value of plan assets	452	411
Defined Benefit Plan, Funded Status of Plan	(67)	(85)
Noncurrent liabilities (assets)	(67)	(85)
Net amount recognized	(67)	(85)
Amounts recognized in accumulated comprehensive income (loss) consist of:
Unrecognized net gain (loss)	$ (94)	$ (66)

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Defined benefit plan assets (liabilities), net.

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Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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