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Stock-based compensation (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024	Oct. 14, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved	18,319,346
Stock options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted-average grant-date fair values	$ 2.47	$ 5.55
Unvested stock options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unamortized stock-based compensation cost	$ 9,100
Weighted average period	2 years 3 months 21 days
Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Remained shares outstanding	75,330,559	44,955,220	45,055,736	45,025,917	37,289,632	37,107,620
2021 Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock reserved							5,411,631
Remained shares outstanding	158,180
Shares available for grant	1,219,890
2021 Plan [Member] \| Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Remained shares outstanding	4,191,741
2013 Plan [Member] \| Common Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Remained shares outstanding	1,594,564
Shares available for grant	0