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Income Taxes - Summary of Supplemental Balance Sheet Information Related to Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets $ 59,189 $ 55,687
Valuation Allowance (50,232) (45,818)
Deferred Tax Assets, net 8,957 9,869
Domestic [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets 47,839 43,791
Valuation Allowance (47,839) (43,791)
International [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets 11,350 11,896
Valuation Allowance (2,393) (2,027)
Deferred Tax Assets, net $ 8,957 $ 9,869