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Income Taxes - Schedule of Income Tax Provisions (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current:    
U.S. federal $ 0 $ 1
State and local (2) 3
Foreign 269 144
Total current provision 267 148
Deferred:    
U.S. federal 10 10
State and local (4) 5
Total deferred provision 6 15
Total tax provision $ 273 $ 163