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Income Taxes - Schedule of Components of Provision For Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:      
Federal $ 0 $ 0 $ 0
State 0 0 0
Foreign 347 360 328
Total current 347 360 328
Deferred:      
Federal 0 0 0
State 0 0 0
Foreign 0 0 0
Total deferred 0 0 0
Total provision for income taxes $ 347 $ 360 $ 328