Income Taxes - Reconciliation of income tax (expense) benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Amount
U.S. Statutory Tax Rate	$ 8,105	$ 7,977
State and Local Income Taxes, Net of Federal Income Tax Effect	$ (254)	$ 4,747
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration]	stpr:CA, stpr:CO, stpr:FL, stpr:GA, stpr:NC, stpr:NY, PENNSYLVANIA	stpr:CA, stpr:CO, stpr:FL, stpr:GA, stpr:NC, stpr:NY, PENNSYLVANIA
Change in valuation allowance	$ (7,315)	$ (11,558)
Effect of Cross-Border Tax Laws	(218)	(128)
Tax Credits	206
Nontaxable or Nondeductible Items	(177)	(321)
Stock Compensation	(568)	(887)
Total income tax (expense) benefit	$ (230)	$ 144
Tax Jurisdiction of Domicile [Extensible Enumeration]	country:US	country:US
Rate reconciliation
U.S. Statutory Tax Rate	(21.00%)	(21.00%)
State rate, net of federal benefit	0.70%	(12.50%)
Change in valuation allowance	18.90%	30.40%
Effect of Cross-Border Tax Laws	0.60%	0.30%
Tax Credits	(0.50%)
Nontaxable or Nondeductible Items	0.40%	0.80%
Stock compensation	1.50%	2.30%
Actual income tax (expense) benefit effective tax rate	0.60%	(0.40%)
United Kingdom
Amount
Statutory tax rate difference between United Kingdom and United States	$ (39)	$ (25)
Change in valuation allowance		$ 339
Rate reconciliation
Statutory tax rate difference between United Kingdom and United States	0.10%	0.10%
Change in valuation allowance		(0.80%)
Germany
Amount
Statutory tax rate difference between United Kingdom and United States	$ 30
Rate reconciliation
Statutory tax rate difference between United Kingdom and United States	(0.10%)