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Income Taxes - Components of Loss Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
U.S. operations $ (58,517) $ (45,492)
Non-U.S. operations 100 98
Loss before income taxes $ (58,417) $ (45,394)