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Income Taxes - 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 beginning of period $ 3,899 $ 274 $ 1,680
Increases based on tax positions taken in the current year 2,075 3,736 0
Increases based on tax positions taken in the prior years 0 0 0
Decreases based on tax positions taken in the prior years 0 0 0
Decreases due to settlements with tax authorities 0 0 0
Decreases due to lapse of applicable statute of limitation (123) (127) (1,379)
Other, net 1 16 (27)
Balance at end of period $ 5,852 $ 3,899 $ 274