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Stockholders' Equity - Weighted-Average assumptions (Details) - $ / shares
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Weighted-average assumptions    
Expected term 6 years 3 months 6 years 3 months
Expected volatility 81.26% 84.54%
Risk-free interest rate 3.54% 1.74%
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 $ 2.00 $ 0.78