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Revenue - Contract balances (Details) - Sales of fuel cell systems - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Disaggregation of revenue
Accounts receivable	$ 148,822	$ 243,811
Contract assets	160,374	155,989
Deferred revenue and contract liabilities	$ 255,802	$ 288,302

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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