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Stock-Based Compensation - Stock Option Valuation (Details) - Stock options to purchase common stock
9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Assumptions used to determine the fair value of stock options granted    
Risk‑free interest rate 4.09% 2.11%
Expected volatility 72.00% 71.00%
Expected dividend yield 0.00% 0.00%
Expected term (in years) 6 years 7 days 6 years 14 days