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Income Taxes - Schedule of Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at the beginning of the year $ 3,650 $ 3,449 $ 3,164
Additions based on tax positions related to the current year 824 667 285
Decreases based on tax positions related to prior years (58) (466) 0
Balance at the end of the year $ 4,416 $ 3,650 $ 3,449