Revenue - Changes in contract assets and contract liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Contract assets
Net change in contract assets	$ (39,515)	$ (10,608)
Contract liabilities
Increases due to cash received, net of amounts recognized as revenue during the period	200,347	182,052
Contract liabilities assumed as part of acquisition	10,011	35,727
Revenue recognized that was included in the contract liability balance as of the beginning of the period	(163,550)	(110,974)
Net change in deferred revenue and contract liabilities	46,808	106,805
Sales of fuel cell systems
Contract assets
Transferred to receivables from contract assets recognized at the beginning of the period	(33,394)	(14,638)
Contract assets assumed as part of acquisition		9,960
Contract assets related to warrants	26,455
Revenue recognized and not billed as of the end of the period	72,469	25,246
Net change in contract assets	65,530	$ 20,568
Contract liabilities
Contract assets related to warrants	$ 26,455