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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, 2020
Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Common stock value (per share) $ 16.36 $ 27.30
Expected volatility 46.14% 47.94%
Risk-free interest rate 0.41% 2.15%
Expected life (years) 7 years 7 years
Forfeiture rate 0.00% 0.00%
Dividend rate 0.00% 0.00%