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Income Taxes - Schedule of Components of Provision For Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 0 $ 0 $ 0
State 0 0 2
Foreign 360 328 302
Total current 360 328 304
Deferred:      
Federal 0 0 0
State 0 0 0
Foreign 0 0 0
Total deferred 0 0 0
Total provision for income taxes $ 360 $ 328 $ 304