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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation A reconciliation of the U.S. federal statutory income tax rate to the Company’s effective income tax rate is as follows:
 
    
Year Ended December 31,
  
    
2020
    
2019
  
Federal statutory income tax rate
      21.0   %      21.0   % 
State taxes, net of federal benefit
              4.2               5.5  
Federal and state research and development tax credits
      12.4       19.4  
Nondeductible items
      (0.7 )      (1.6 ) 
Stock-based compensation
                          97.2                           13.3  
Other
      2.2       (0.9 ) 
Change in valuation allowance
      (136.3 )      (56.7 ) 
    
 
 
    
 
 
  
Effective income tax rate
    —   %    —   % 
    
 
 
    
 
 
  
Schedule of Deferred Tax Assets and Liabilities
Net deferred tax assets as of December 31, 2020 and 2019 consisted of the following (in thousands):
 
    
December 31,
  
    
2020
    
2019
  
Deferred tax assets:
      
Net operating loss carryforwards
    $               19,197     $ 8,165  
Research and development tax credit carryforwards
      6,470       5,040  
Accrued expenses and other current liabilities
      566       671  
Intangible assets
      1,598       33  
Property and equipment
      220       215  
Stock-based compensation
      3,092       1,463  
Operating lease liability
      2,829       —  
Other
      221       725  
    
 
 
    
 
 
  
Total deferred tax assets
      34,193                     16,312  
Valuation allowance
      (30,558 )      (15,292 ) 
    
 
 
    
 
 
  
Net deferred tax assets
      3,635       1,020  
    
 
 
    
 
 
  
Deferred tax liabilities:
                 
Capitalized software development costs
      (1,088 )      (1,020 ) 
Operating lease
right-of-use
assets
      (2,547 )      —  
    
 
 
    
 
 
  
Deferred tax liabilities
      (3,635 )       (1,020 ) 
  
 
 
     
 
 
  
Net deferred tax assets and liabilities
    $ —     $ —  
    
 
 
    
 
 
  
Summary of Changes in Valuation Allowance The changes in the valuation allowance were as follows (in thousands):
 
    
Year Ended December 31,
  
    
2020
     
2019
  
Valuation allowance as of beginning of year
    $ 15,292      $ 11,257  
Increases recorded to tax provision
      15,266        4,035  
    
 
 
     
 
 
  
Valuation allowance as of end of year
    $ 30,558  
 
 
 
  		 $ 15,292