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Stock-based Compensation - Weighted-Average assumptions (Details) - $ / shares
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Weighted-average assumptions    
Expected term 6 years 3 months 6 years 3 months
Expected volatility 90.37% 79.56%
Risk-free interest rate 3.89% 3.52%
Expected dividend yield 0.00% 0.00%
2013 Equity Incentive and Inducement Plan    
Share-based Compensation Arrangement by Share-based Payment Award    
Weighted-average fair value of the options granted $ 2.44 $ 2.04