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Revenue - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Disaggregation of Revenue [Line Items]
Accounts receivable, net	$ 35,261,000		$ 23,737,000	$ 5,600,000
Contract asset	0		0
Contract liability			$ 100,000	$ 1,600,000
Revenue recognized	100,000	$ 300,000
Sale of battery products
Disaggregation of Revenue [Line Items]
Revenue	28,336,000	10,984,000
Bill-and-hold
Disaggregation of Revenue [Line Items]
Revenue	17,100,000
Bill-and-hold | Sale of battery products
Disaggregation of Revenue [Line Items]
Revenue	$ 5,800,000	$ 5,400,000

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