Stock-based Compensation - Valuation assumptions (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Stock-based Compensation
Per share fair value of common stock	$ 2.79	$ 17.04	$ 3.79	$ 17.04
Expected volatility - Minimum	67.60%	67.87%	67.60%	67.87%
Expected volatility - Maximum	68.00%	68.86%	70.50%	68.86%
Expected term (in years)	5 years 6 months
Risk-free rate		4.00%		4.00%
Risk-free rate - Minimum	3.90%		3.80%
Risk-free rate - Maximum	4.30%		4.30%
Minimum
Stock-based Compensation
Expected term (in years)		5 years 6 months	5 years 6 months	5 years 6 months
Maximum
Stock-based Compensation
Expected term (in years)		6 years 3 months	6 years 3 months	6 years 3 months