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Balance Sheet Components - Inventories, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Raw materials $ 351,757 $ 315,735
Work-in-progress 125,036 79,601
Finished goods 166,513 149,320
Inventory, net [1] 643,306 544,656
Inventory reserves 39,300 $ 15,900
Electrolyzer Inventory    
Property, Plant and Equipment [Line Items]    
Inventory reserves $ 19,700  
[1] We have variable interest entity related to a joint venture in the Republic of Korea (see Note 12—Related Party Transactions in this Annual Report on Form 10-K), which represents a portion of the consolidated balances recorded within these financial statement line items.