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Related Party Transactions (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 01, 2024	Dec. 31, 2025	Dec. 31, 2024	Nov. 03, 2024	Feb. 09, 2024	Dec. 20, 2021
Related Party Transactions.
Revenue from Related Parties		$ 21,747	$ 20,139
Cost of services		20,649	20,284
Payments made to acquire equity method investments			656
Loss on extinguishment of note receivable			$ (760)
Minimum \| BMW
Related Party Transactions.
Ownership (in percentage)						5.00%
Minimum \| Ford
Related Party Transactions.
Ownership (in percentage)					5.00%
Restricted stock \| Share Based Payment Arrangement Non Employee
Related Party Transactions.
Granted	298,508		298,508
Related Party \| BMW
Related Party Transactions.
Revenue subject to achieving certain milestones		20,000
Related Party \| Purchase of materials \| BMW
Related Party Transactions.
Amounts of related party transaction		225	$ 132
Proceeds from related party		344
Revenue from Related Parties		189	$ 5,410
Deferred revenue		172
Related Party \| JDA \| BMW
Related Party Transactions.
Deferred revenue		75
Related Party \| Advance \| BMW
Related Party Transactions.
Deferred revenue		97
Equity method investee \| Dahae Energy Co., Ltd
Related Party Transactions.
Ownership percentage, equity method			20.00%
Payments made to acquire equity method investments			$ 656
Transaction costs			256
Equity method investee \| Dahae Energy Co., Ltd
Related Party Transactions.
Loss on extinguishment of note receivable			$ (760)
Fair value of embedded derivative		584
Equity method investee \| Corporate bonds \| Dahae Energy Co., Ltd
Related Party Transactions.
Explicit interest rate			3.00%
Par value of bond			$ 4,448
Fair value of the bond			2,497
Fair value of embedded derivative			584
Debt discount		1,796
Equity method investee \| Warrants \| Dahae Energy Co., Ltd
Related Party Transactions.
Fair value of the bond			607
Remeasurement of restricted stock awards		$ 323
Equity method investee \| Term loan facility \| Dahae Energy Co., Ltd
Related Party Transactions.
Principal amount				$ 1,161
Interest rate				3.00%
Equity method investee \| Additional Term Loan Facility \| Dahae Energy Co., Ltd
Related Party Transactions.
Amount of additional financing			$ 2,000
Equity method investee \| Restricted stock \| Dahae Energy Co., Ltd
Related Party Transactions.
Granted			298,508
Equity method investee \| On exercise of warrants \| Warrants \| Dahae Energy Co., Ltd
Related Party Transactions.
Ownership percentage, equity method			40.00%