Revenue - Changes in contract assets and contract liabilities (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Contract assets
Net change in contract assets	$ (39,040)	$ (7,027)
Contract liabilities
Increases due to cash received, net of amounts recognized as revenue during the period	186,470		$ 200,347
Change in contract liabilities related to warrants	2,719
Contract liabilities assumed as part of acquisition			10,011
Revenue recognized that was included in the contract liability balance as of the beginning of the period	165,490		163,550
Net change in deferred revenue and contract liabilities	23,699		46,808
Sales of fuel cell systems
Contract assets
Transferred to receivables from contract assets recognized at the beginning of the period	(72,098)		(33,394)
Change in contract assets related to warrants	10,644		26,455
Impairment	(9,799)
Revenue recognized and not billed as of the end of the period	108,419		72,469
Net change in contract assets	$ 37,166		$ 65,530