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Stock Option Plan - Summary of Weighted Average Assumptions to Calculate the Fair Value of Stock-Based Compensation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Expected volatility 80.19% 69.60%
Expected dividend yield 0.00%  
Expected term (in years) 6 years 3 months 6 years 3 months
Risk-free interest rate 1.90% 2.91%