Revenue - Schedule of Composition of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Other revenue – government grants	$ 200	$ 0	$ 500	$ 0
Total revenue	15,067	3,345	26,351	5,681
Sale of battery products
Disaggregation of Revenue [Line Items]
Revenue	14,542	3,345	25,526	5,681
Customization design services
Disaggregation of Revenue [Line Items]
Revenue	$ 325	$ 0	$ 325	$ 0