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Income Taxes - Summary of Income (Loss) Before Income Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Income loss Before Income Tax [Line Items]
US			$ 89,416	$ 62,706
Korea			(14,199)	(12,839)
Income before income tax	$ 26,107	$ 16,488	$ 75,217	$ 49,867

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Schedule Of Income loss Before Income Tax [Line Items]

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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