Share-Based Compensation - Schedule of Fair Value of Stock Options Estimated on Date of Grant Using Black-Scholes Option Pricing Model (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, minimum	0.40%	1.50%
Risk-free interest rate, maximum	0.50%	2.30%
Expected volatility, minimum	74.80%	80.20%
Expected volatility, maximum	81.40%	81.90%
Expected dividend yield	0.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock fair value	$ 4.29	$ 3.40
Expected term (in years)	5 years 6 months	5 years 7 months 6 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock fair value	$ 61.47	$ 4.77
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days