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Stock-Based Compensation - Weighted Average Fair Value Assumptions (Details) - Stock options
9 Months Ended
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected term (in years) 5 years 11 months 4 days
Expected volatility 58.60%
Risk-free interest rate 0.90%
Expected dividend yield 0.00%