Revenue - Schedule of Composition of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 2,798	$ 816	$ 5,109	$ 3,617
Total revenue from customers
Disaggregation of Revenue [Line Items]
Revenue	2,798	816	4,847	3,617
Sale of battery products
Disaggregation of Revenue [Line Items]
Revenue	2,194	488	3,956	1,781
Customized design services
Disaggregation of Revenue [Line Items]
Revenue	604	328	891	1,836
Other revenue – government grant
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0	$ 262	$ 0