Revenue - Changes in contract assets and contract liabilities (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Contract assets
Net change in contract assets	$ (23,807)	$ (386)
Contract liabilities
Increases due to cash received, net of amounts recognized as revenue during the period	137,526		$ 200,347
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	(115,688)		(163,550)
Net change in deferred revenue and contract liabilities	21,838		46,808
Sales of fuel cell systems
Contract assets
Transferred to receivables from contract assets recognized at the beginning of the period	(34,966)		(33,394)
Contract assets related to warrants	6,510		26,455
Impairment	(9,799)
Revenue recognized and not billed as of the end of the period	58,553		72,469
Net change in contract assets	$ 20,298		$ 65,530