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Accumulated Other Comprehensive Income - Summary of Accumulated Balances Related to Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Equity [Abstract]
Foreign currency translation	$ 42	$ 13
Unrealized gain on marketable securities	337	236
Accumulated other comprehensive income	$ 379	$ 249

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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