Equity Incentive Plan - Valuation assumptions (Details) - 2019 Equity Incentive Plan	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Equity Incentive Plan
Expected volatility, minimum	83.80%	84.80%
Expected volatility, maximum	92.30%	91.60%
Risk-free rate, minimum	4.18%	3.41%
Risk-free rate, maximum	4.64%	4.73%
Expected dividend yield	0.00%	0.00%
Minimum
Equity Incentive Plan
Expected term in years	5 years 6 months	5 years 6 months
Maximum
Equity Incentive Plan
Expected term in years	10 years	10 years