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Income Taxes - Summary of Income Tax (Benefit) Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Federal $ 8 $ 260 $ 124
State and local 122 109 126
Foreign 1,149 255 228
Total current tax expense 1,279 624 478
Deferred:      
Federal 9 9 (285)
State and local 2 2 16
Foreign 696 (593) 257
Total deferred tax expense (benefit) 707 (582) (12)
Income tax expense $ 1,986 $ 42 $ 466