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Income Taxes - Summary of Operating Loss Carryforwards (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards $ 399,795 $ 384,635
Federal    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards 197,607 175,488
State    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards 166,196 172,905
Foreign    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards $ 35,992 $ 36,242