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Stock-Based Compensation - Assumptions (Details)
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Weighted-average assumptions    
Risk-free interest rate 1.80% 0.70%
Expected volatility 85.20% 71.20%
Expected term (in years) 6 years 5 years 10 months 24 days
Expected dividend yield 0.00% 0.00%