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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]    
Dividends, common stock, cash $ 0  
Accounting Standards Update No. 2019-12 [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Change In Accounting Principle Accounting Standards Update Adopted true  
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2021  
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect true  
ATM Sales Agreement [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Deferred offering costs $ 162,000 $ 284,000
Reduction in stockholders' equity $ 508,000 $ 105,000
Computer Equipment [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Property, Equipment and leasehold improvements, useful life 3 years  
Furniture and Office Equipment [Member]    
Summary Of Significant Accounting Policies [Line Items]    
Property, Equipment and leasehold improvements, useful life 5 years