Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Provision for (Benefit from) Income Taxes (Detail)

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Income Taxes - Components of Provision for (Benefit from) Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current provision for (benefit from) income taxes:      
Federal $ 0 $ 0 $ (31)
State 2 0 (15)
Foreign 13 12 2
Total current provision for (benefit from) income taxes $ 15 $ 12 $ (44)