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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax [Line Items]    
U.S. federal income tax rates 21.00% 21.00%
Federal and state net operating and capital losses $ 16,300  
Valuation allowance 43,314 $ 19,126
Change in the valuation allowance 24,200 $ (15,900)
Federal    
Income Tax [Line Items]    
Net operating loss carryforwards $ 102,500  
Net operating loss carryforwards expiration year 2032  
Research and Development Tax Credit    
Income Tax [Line Items]    
Net operating loss carryforwards $ 4,500  
Net operating loss carryforwards expiration year 2029  
State and City    
Income Tax [Line Items]    
Net operating loss carryforwards $ 147,300  
Net operating loss carryforwards expiration year 2023