Equity Incentive Plan - Valuation assumptions (Details) - 2019 Equity Incentive Plan	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Equity Incentive Plan
Expected volatility, minimum	83.00%	83.80%
Expected volatility, maximum	83.60%	92.30%
Risk-free rate, minimum	3.99%	4.18%
Risk-free rate, maximum	4.38%	4.64%
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