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Stockholder's Equity (Deficit) - Summary of Weighted Average Assumptions Used in Black-Sholes Option-pricing Model (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Common stock value (per share) $ 39.83 $ 16.36
Expected volatility 58.34% 46.14%
Risk-free interest rate 0.77% 0.41%
Expected life (years)   7 years
Forfeiture rate 0.00% 0.00%
Dividend rate 0.00% 0.00%
Minimum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected life (years) 5 years 6 months  
Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected life (years) 7 years