CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 0	$ 5,000	$ 0	$ 2,939,000
Operating expense:
Cost of revenue	3,286,000	8,203,000	6,534,000	10,226,000
Research and development	10,857,000	9,241,000	32,794,000	26,660,000
Selling, general, and administrative	21,044,000	36,103,000	100,999,000	75,920,000
Restructuring and asset impairment (Note 4)	4,885,000	0	4,885,000	0
Total operating expenses	40,072,000	53,547,000	145,212,000	112,806,000
Loss from operations	(40,072,000)	(53,542,000)	(145,212,000)	(109,867,000)
Other income (expense):
Change in fair value of private placement warrant liability	(240,000)	3,447,000	561,000	13,385,000
Change in fair value of earnout liability	(1,307,000)	18,034,000	6,029,000	87,371,000
Gain (loss) on equity securities	0	0	0	10,082,000
Foreign currency transaction loss	(3,877,000)	(4,539,000)	(2,447,000)	(7,143,000)
Investment income and interest income, net	1,441,000	947,000	6,501,000	1,018,000
Total other income (expense)	(3,983,000)	17,889,000	10,644,000	104,713,000
Loss before income taxes	(44,055,000)	(35,653,000)	(134,568,000)	(5,154,000)
Income tax expense	0	0	0	526,000
Net loss	(44,055,000)	(35,653,000)	(134,568,000)	(5,680,000)
Less: Net loss attributable to noncontrolling interest	(1,000)	(10,858,000)	(18,000)	(16,361,000)
Net income (loss) attributable to Hyzon	(44,054,000)	(24,795,000)	(134,550,000)	10,681,000
Comprehensive income (loss):
Net loss	(44,055,000)	(35,653,000)	(134,568,000)	(5,680,000)
Foreign currency translation adjustment	2,721,000	862,000	986,000	838,000
Net change in unrealized gain (loss) on short-term investments	286,000	131,000	(702,000)	131,000
Comprehensive loss	(41,048,000)	(34,660,000)	(134,284,000)	(4,711,000)
Less: Comprehensive income (loss) attributable to noncontrolling interest	5,000	(9,705,000)	10,000	(14,714,000)
Comprehensive income (loss) attributable to Hyzon	$ (41,053,000)	$ (24,955,000)	$ (134,294,000)	$ 10,003,000
Net income (loss) per share attributable to Hyzon:
Basic (dollars per share)	$ (0.18)	$ (0.10)	$ (0.55)	$ 0.04
Diluted (dollars per share)	$ (0.18)	$ (0.10)	$ (0.55)	$ 0.04
Weighted average common shares outstanding:
Basic (in shares)	244,885,000	248,164,000	244,686,000	248,054,000
Diluted (in shares)	244,885,000	248,164,000	244,686,000	257,828,000