Hyzon Motors (HYZN) 10-K/A 14 Mar 23 2021 FY Annual report (amended) Financial data

Cover

Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 01, 2023	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K/A
Amendment Flag	true
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Registrant Name	Hyzon Motors Inc.
Entity Central Index Key	0001716583
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity File Number	001-39632
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-2726724
Entity Address, Address Line One	475 Quaker Meeting House Road
Entity Address, City or Town	Honeoye Falls
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14472
City Area Code	585
Local Phone Number	484-9337
Document Annual Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		244,559,301
Auditor Name	KPMG LLP
Auditor Firm ID	185
Auditor Location	Rochester, New York
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Public Float			$ 232.7
Amendment Description	EXPLANATORY NOTEHyzon Motors Inc. ("Hyzon", the "Company", "we", "our" or "us") filed our Annual Report on Form 10-K for the year ended December 31, 2021 (the "Original Filing") with the Securities and Exchange Commission ("SEC") on March 30, 2022. This Amendment No. 1 on Form 10-K/A (this "Form 10-K/A") is being filed to amend and restate certain items contained in the Original Filing (the "Restatement").Restatement Background As previously reported in the Company's Current Report on Form 8-K filed with the SEC on August 17, 2022, the Audit Committee of the Board of Directors (the "Board") of the Company (the "Audit Committee"), based on the recommendation of management, determined that the Company's previously issued financial statements included in the Company’s Original Filing and the Company’s previously issued financial statements included in the Company’s Quarterly Report on Form 10-Q for the period ended March 31, 2022 should no longer be relied upon and require restatement because of issues regarding revenue recognition and internal controls and procedures, primarily pertaining to our China operations. As further previously reported in the Company's Current Report on Form 8-K filed with the SEC on February 9, 2023, the Audit Committee, based on the recommendation of management, determined that the Company’s previously issued financial statements included in the Company’s Quarterly Report on Form 10-Q for the period ended September 30, 2021 should no longer be relied upon and also require restatement primarily because of issues regarding revenue recognition relating to its European joint venture operations. For a more detailed discussion of the Restatement, refer to Note 2. Restatement of Previously Issued Financial Statements to the consolidated financial statements of the Company included herein. Special Committee InvestigationAs previously reported in the Company's Current Report on Form 8-K filed with the SEC on August 4, 2022, in connection with the preparation of the Company's financial results for the period ended June 30, 2022, the Board appointed a committee of Board members (the "Special Committee") to investigate, with the assistance of outside counsel and other advisors, the issues described above regarding revenue recognition and internal controls and procedures that were brought to the attention of the Board by management (the "Investigation"). The preliminary findings of the Investigation were completed in January 2023, and the final findings were issued in March 2023 as discussed in this Explanatory Note below. Investigation with Respect to China OperationsOn January 12, 2022, the Company announced the delivery of 87 fuel cell powered heavy-duty vehicles in 2021, which included 82 vehicles delivered to customers in China. In July 2022, management discovered and brought to the attention of the Board that certain vehicles may not have met the criteria necessary to recognize revenue as of December 31, 2021. The Special Committee was formed to conduct an investigation regarding the Company’s revenue recognition timing and internal controls and procedures, primarily pertaining to the Company’s China operations during the second half of 2021 and the first half of 2022. The Investigation confirmed matters discovered by management in July 2022 that certain vehicles delivered to customers in China in December 2021 were not operable on hydrogen at the time of delivery (i.e., were not commissioned). As part of its internal review, the Company determined that the assembly of those vehicles was complete at the time of initial delivery but they had not undergone final commissioning, which generally consists of injecting hydrogen through the fuel cell powertrain system and conducting other tests necessary to ensure that the hydrogen fuel cell will power the vehicle. Additionally, based on the Investigation's findings, the Company determined that it did not have an appropriate control environment focused on certain operational processes and procedures such as a formalized commissioning policy and a quality assurance process. Based on the Investigation's findings, the Company concluded that the Company's contractual performance obligation to deliver functioning fuel cell electric vehicles ("FCEVs") was not fully satisfied for revenue recognition purposes under Accounting Standards Codification (“ASC”) Topic 606, Revenue from Contracts with Customers ("ASC 606"). For additional information regarding the corrections to the financial statements, refer to Note 2. Restatement of Previously Issued Financial Statements to the consolidated financial statements of the Company included herein. Correction of the errors is also reflected in the restated interim financial statements for the period ended March 31, 2022 included in the Company's amended Quarterly Report on Form 10-Q/A.Investigation with Respect to European OperationsThe Special Committee identified certain issues associated with Hyzon Motors Europe B.V. ("Hyzon Europe"), the Company's European joint venture. The Investigation revealed that certain former members of Hyzon Europe's senior management team created a workplace culture where employees did not feel comfortable raising concerns. Additionally, the Investigation revealed that for five vehicles for which Hyzon Europe recognized revenue in 2021, Hyzon Europe subsequently performed various levels of work and repair efforts on such vehicles after revenue had been recognized. Consequently, the Company conducted an internal accounting review for its European customer arrangements. This internal accounting review concluded that for the Hyzon Europe customer contracts which were assumed from Holthausen Clean Technology B.V. in July 2021, the Company did not appropriately analyze and record revenue and related balances associated with these arrangements. More specifically, the Company determined that instead of manufacturing or assembling FCEVs that it owned for sale to customers, Hyzon Europe was providing these customers with vehicle retrofit services to convert the customers' internal combustion engine ("ICE") powered vehicles to hydrogen FCEVs. Therefore, Hyzon Europe should have recognized revenue over time utilizing an input method rather than recording revenue at a point in time. For additional information regarding the corrections to the financial statements, refer to Note 2. Restatement of Previously Issued Financial Statements to the consolidated financial statements of the Company included herein. Correction of the errors is also reflected in the interim financial statements for the periods ended September 30, 2021 and March 31, 2022 included in the Company's amended Quarterly Reports on Form 10-Q/A.Transaction CostsOn July 16, 2021, legacy Hyzon Motors Inc. ("Legacy Hyzon") and now named Hyzon Motors USA Inc. consummated the transactions contemplated by the Business Combination Agreement and Plan of Reorganization (the “Business Combination”), dated February 8, 2021, with Decarbonization Plus Acquisition Corporation (“DCRB”) to effect a business combination between DCRB and Legacy Hyzon with DCRB Merger Sub Inc., a wholly owned subsidiary of DCRB, merging with and into Legacy Hyzon, with Legacy Hyzon surviving the merger as a wholly owned subsidiary of DCRB. The Company has adjusted its prior allocation of transaction costs incurred in connection with the Business Combination to reflect the allocation of the correct balance of Company incurred transaction costs between the liability classified earnout arrangement and the newly issued equity instruments in the Business Combination in the third quarter of 2021. The adjustment resulted in a reduction of amounts previously allocated to the earnout liability and recognized as expense, offset by an equal increase of transaction costs allocated to the newly issued equity instruments and recorded against additional paid-in capital. For additional information regarding the corrections to the financial statements, refer to Note 2. Restatement of Previously Issued Financial Statements to the consolidated financial statements of the Company included herein. Correction of the error is also reflected in the restated interim financial statements for the periods ended September 30, 2021 and March 31, 2022 included in the Company's amended Quarterly Reports on Form 10-Q/A.Other Immaterial ErrorsIn addition to the errors described above, the Company’s previously issued financial statements included in the Company’s Original Filing and the Company's previously issued unaudited interim financial information included in the Company’s Quarterly Reports on Form 10-Q for the periods ended September 30, 2021 and March 31, 2022 have been corrected in the amended filings to include previously unrecorded immaterial adjustments (the “Other Immaterial Errors”). For additional information regarding the Other Immaterial Errors, refer to Note 2. Restatement of Previously Issued Financial Statements to the consolidated financial statements of the Company included herein.The errors described above and the Other Immaterial Errors in this amended Annual Report on Form 10-K/A did not impact cash or the economics of the Company's existing commercial arrangements. Internal Control ConsiderationsIn connection with the Restatement, the Company has concluded there were material weaknesses in the Company’s internal control over financial reporting as of December 31, 2021 and its disclosure controls and procedures were not effective as of December 31, 2021. Management is taking steps to remediate the material weaknesses in our internal control over financial reporting. For a discussion of management’s consideration of our disclosure controls and procedures, internal control over financial reporting, and the material weaknesses identified, see Part II, Item 9A. Controls and Procedures of this Form 10-K/A.Items Amended in this Form 10-K/AThis Form 10-K/A presents the Original Report, amended and restated with modifications as necessary to reflect the correction of Restatement Items and Other Immaterial Errors. The following items have been amended:    •Part 1 - Item 1A. Risk Factors •Part II - Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations•Part II - Item 8. Financial Statements and Supplementary Data•Part II - Item 9A. Controls and Procedures•Part IV - Item 15. Exhibit and Financial Statement Schedules Except as described above and in Note 21. Subsequent Events (unaudited), this Form 10-K/A does not amend, update or change any other items or disclosures in the Original Filing and does not purport to reflect any information or events subsequent to the filing thereof. As such, this Form 10-K/A speaks only as of the date the Original Filing was filed, and the Company has not undertaken herein to amend, supplement, or update any information contained in the Original Filing to give effect to any subsequent events. Among other things, forward-looking statements made in the Original Filing have not been revised to reflect events, results or developments that occurred or facts that became known to us after the date of the Original Filing, other than the Restatement. In addition, in accordance with SEC rules, this Form 10-K/A includes updated certifications from our Chief Executive Officer as Exhibits 31.1 and 32.1 dated as of the filing date of this Form 10-K/A. Accordingly, this Form 10-K/A should be read in conjunction with our filings made with the SEC subsequent to the filing of the Original Filing, including any amendments to those filings.
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock, par value $0.0001 per share
Trading Symbol	HYZN
Security Exchange Name	NASDAQ
Warrant
Document Information [Line Items]
Title of 12(b) Security	Warrants, each whole warrant exercisable for one share of Class A common stock, $0.0001 par value, at an exercise price of $11.50 per share
Trading Symbol	HYZNW
Security Exchange Name	NASDAQ

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets
Cash	$ 445,146	$ 17,139
Accounts receivable	2,956	0
Related party receivable	264	0
Inventory	20,927	0
Prepaid expenses and other current assets	26,852	848
Total current assets	496,145	17,987
Property, plant, and equipment, net	14,346	418
Right-of-use assets	10,265	1,656
Investments in equity securities	4,948	122
Other assets	4,575	822
Total Assets	530,279	21,005
Current liabilities
Accounts payable	7,980	215
Accrued liabilities	6,770	1,062
Related party payables	3,695	560
Contract liabilities	10,925	2,608
Current portion of lease liabilities	1,886	618
Total current liabilities	31,256	5,063
Long term liabilities
Lease liabilities	8,830	1,181
Private placement warrant liability	15,228
Earnout liability	103,761
Other liabilities	1,139
Total liabilities	160,214	6,244
Commitments and Contingencies
Stockholders’ Equity
Common stock, $0.0001 par value; 400,000,000 shares authorized, 247,758,412 and 166,125,000 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively.	25	17
Additional paid-in capital	400,826	29,122
Accumulated deficit	(26,412)	(14,271)
Accumulated other comprehensive income (loss)	378	(16)
Total Hyzon Motors Inc. stockholders’ equity	374,817	14,852
Noncontrolling interest	(4,752)	(91)
Total Stockholders’ Equity	370,065	14,761
Total Liabilities and Stockholders’ Equity	$ 530,279	$ 21,005

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Common stock, par value (in usd per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	400,000,000	400,000,000
Common stock, shares issued (in shares)	247,758,412	166,125,000
Common stock, shares outstanding (in shares)	247,758,412	166,125,000

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Revenue		$ (80)
Operating expense:
Cost of revenue		15,634
Research and development	$ 1,446	15,461
Selling, general, and administrative	12,785	67,853
Total operating expenses	14,231	98,948
Loss from operations	(14,231)	(99,028)
Other income (expense):
Change in fair value of private placement warrant liability		4,167
Change in fair value of earnout liability		84,612
Foreign currency exchange loss and other expense	(108)	(1,409)
Interest expense, net	(37)	(5,235)
Total other income (expense)	(145)	82,135
Net loss	(14,376)	(16,893)	$ 16,900
Less: Net loss attributable to noncontrolling interest	(105)	(4,752)
Net loss attributable to Hyzon	(14,271)	(12,141)
Comprehensive loss:
Net loss	(14,376)	(16,893)	$ 16,900
Foreign currency translation adjustment	(20)	485
Comprehensive loss	(14,396)	(16,408)
Less: Comprehensive loss attributable to noncontrolling interest	(109)	(4,661)
Comprehensive loss attributable to Hyzon	$ (14,287)	$ (11,747)
Net loss attributable to Hyzon per share:
Basic (in usd per share)	$ (0.09)	$ (0.06)
Diluted (in usd per share)	$ (0.09)	$ (0.06)
Weighted average common shares outstanding:
Basic (in shares)	152,650,000	203,897,000
Diluted (in shares)	152,650,000	203,897,000

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Total	Total Hyzon Motors Inc. Stockholders’ Equity (Deficit)	Common Stock Legacy Common Stock	Common Stock Common Stock Class A	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Noncontrolling Interest	Retroactive application of recapitalization	Retroactive application of recapitalization Total Hyzon Motors Inc. Stockholders’ Equity (Deficit)	Retroactive application of recapitalization Common Stock Legacy Common Stock	Retroactive application of recapitalization Common Stock Common Stock Class A	Retroactive application of recapitalization Additional Paid-in Capital	Retroactive application of recapitalization Retained Earnings (Accumulated Deficit)	Retroactive application of recapitalization Accumulated Other Comprehensive Loss	Retroactive application of recapitalization Noncontrolling Interest
Beginning Balance at Jan. 20, 2020		$ 84	$ 84	$ 0	$ 15	$ 69	$ 0	$ 0	$ 0	$ 84	$ 84	$ 84	$ 0	$ 0	$ 0	$ 0	$ 0
Beginning Balance (in shares) at Jan. 20, 2020				0	148,405,000							83,750,000	0
Retroactive application of recapitalization												$ (84)	$ 15	$ 69
Retroactive application of recapitalization (in shares)												(83,750,000)	148,405,000
Issuance of common stock, net of issuance costs	[1]	18,476	18,476	$ 0	$ 2	18,474
Issuance of common stock, net of issuance costs (in shares)	[1]			0	17,277,000
Stock-based compensation		10,079	10,079			10,079
Non-controlling interest capital contribution		18							18
Net loss attributable to Hyzon		(14,271)	(14,271)				(14,271)
Net loss attributable to noncontrolling interest		(105)							(105)
Foreign currency translation loss		(20)	(16)					(16)	(4)
Conversion of convertible notes		500	500		$ 0	500
Conversion of convertible notes (in shares)				0	443,000
Ending Balance at Dec. 31, 2020		14,761	14,852	$ 0	$ 17	29,122	(14,271)	(16)	(91)
Ending Balance (in shares) at Dec. 31, 2020				0	166,125,000
Issuance of common stock, net of issuance costs					$ 1	(1)
Issuance of common stock, net of issuance costs (in shares)					7,234,006
Exercise of stock options		532	532			532
Exercise of stock options (in shares)					436,037
Reverse recapitalization transaction, net (Note 4)		$ 351,505	351,505		$ 7	351,498
Reverse recapitalization transaction, net (Note 4) (in shares)					73,502,303
Common stock issued for the cashless exercise of warrants (in shares)					32,959
Vesting of RSUs (in shares)		8,300			428,107
Stock-based compensation		$ 30,027	30,027			30,027
IP transaction – deemed distribution		(10,000)	(10,000)			(10,000)
Net loss attributable to Hyzon		(12,141)	(12,141)				(12,141)
Net loss attributable to noncontrolling interest		(4,752)							(4,752)
Foreign currency translation loss		485	394					394	91
Repurchase of warrants		(540)	(540)			(540)
Issuance of Hongyun Warrants		188	188			188
Ending Balance at Dec. 31, 2021		$ 370,065	$ 374,817	$ 0	$ 25	$ 400,826	$ (26,412)	$ 378	$ (4,752)
Ending Balance (in shares) at Dec. 31, 2021				0	247,758,412
[1]Issuance of common stock, net of issuance costs of $1,024 and conversion of convertible notes have been retroactively restated to give effect to the recapitalization transaction.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Payments of Stock Issuance Costs		$ 1,024
Initial Public Offering
Issuance costs	$ 1,024

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net loss		$ (14,376)	$ (16,893)	$ 16,900
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		185	1,140
Stock-based compensation		9,983	30,087
Loss on extinguishment of convertible notes			107
Noncash interest expense			5,224
Issuance of warrants			188
Change in fair value of private placement warrant liability			4,167
Fair value adjustment of earnout liability			(84,612)
Changes in operating assets and liabilities:
Accounts receivable			(2,971)
Inventory			(20,958)
Prepaid expenses and other current assets		(824)	(24,937)
Other assets		0	(169)
Accounts payable		215	8,526
Accrued liabilities		467	4,891
Related party payables		560	(227)
Contract liabilities		2,608	9,318
Other liabilities			1,146
Net cash used in operating activities		(1,182)	(94,307)
Cash Flows from Investing Activities:
Purchases of property and equipment		(431)	(14,560)
Advanced payments for capital expenditures			(1,172)
Investment in equity securities			(98)
Investment in non-consolidated affiliates		(122)	(4,826)
Net cash used in investing activities		(553)	(20,656)
Cash Flows from Financing Activities:
Proceeds from issuance of common stock, net of transaction costs		18,560	0
Proceeds from Business Combination, net of redemption and transaction costs (Note 4)			508,993
Payment for purchase of Horizon IP			(6,900)
Exercise of stock options			532
Payment of finance lease liability		(29)	(203)
Debt issuance costs			(133)
Repurchase of warrants			(540)
Deferred transaction costs		(137)	0
Proceeds from issuance of convertible notes	$ 45,000	500	45,000
Net cash provided by financing activities		18,894	546,749
Effect of exchange rate changes on cash		(20)	440
Net change in cash and restricted cash		17,139	432,226
Cash—Beginning			17,139
Cash and restricted cash—Ending		$ 17,139	449,365	$ 17,139
Supplemental schedule of non-cash investing activities and financing activities:
Conversion of Legacy Hyzon Common Stock			73
Recognition of earnout liability in Business Combination			188,373
Recognition of Private Placement Warrant liability in Business Combination			19,395
Horizon IP Agreement - Fee			10,000
Conversion of convertible notes for common stock			50,198
Acquisitions of property and equipment included in current liabilities			$ 61

Nature of Business and Basis of

Nature of Business and Basis of Presentation	12 Months Ended
	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business and Basis of Presentation	Nature of Business and Basis of Presentation Description of Business Hyzon Motors Inc. ("Hyzon" or the "Company"), formerly known as Decarbonization Plus Acquisition Corporation ("DCRB"), headquartered in Honeoye Falls, New York, was incorporated in the State of Delaware on September 7, 2017. The Company is majority-owned by Hymas Pte. Ltd. ("Hymas"), which is majority-owned but indirectly controlled by Horizon Fuel Cell Technologies PTE Ltd., a Singapore company ("Horizon"). Hyzon assembles and supplies hydrogen fuel cell-powered commercial vehicles across North America, Europe, China, and Australia. In addition, Hyzon builds and fosters a clean hydrogen supply ecosystem with leading partners from feedstocks through production, dispensing and financing. On February 8, 2021, Legacy Hyzon Motors Inc. ("Legacy Hyzon"), incorporated in the State of Delaware on January 21, 2020, entered into a Business Combination Agreement and Plan of Reorganization (the "Business Combination") with DCRB to effect a business combination between DCRB and Legacy Hyzon with DCRB Merger Sub Inc., a wholly owned subsidiary of DCRB, merging with and into Legacy Hyzon, with Legacy Hyzon surviving the merger as a wholly owned subsidiary of DCRB. The transaction was unanimously approved by DCRB’s Board of Directors and was approved at a special meeting of DCRB’s stockholders on July 15, 2021. On July 16, 2021, Legacy Hyzon completed its business combination with DCRB. Concurrent with the completion of the Business Combination, DCRB changed its name to “Hyzon Motors Inc.” and Legacy Hyzon changed its name to “Hyzon Motors USA Inc.” Basis of Presentation The accompanying consolidated financial statements and related disclosures have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") pursuant to the requirements and rules of the Securities and Exchange Commission (“SEC”). Any reference in these notes to applicable guidance refers to U.S. GAAP as found in U.S. Accounting Standards Codification ("ASC") and Accounting Standards Update ("ASU") of the Financial Accounting Standards Board ("FASB"). Principles of Consolidation The consolidated financial statements reflect the Company’s accounts and operations, those of its wholly owned subsidiaries and subsidiaries in which the Company has a controlling financial interest. In accordance with the provisions of ASC 810, Consolidation , the Company consolidates any variable interest entity (“VIE”) of which the Company is the primary beneficiary. The Company assesses its relationships with all the VIEs on an ongoing basis to evaluate whether the Company continues to be the primary beneficiary. All intercompany accounts and transactions are eliminated upon consolidation. The Company's share of earnings or losses of nonconsolidated affiliates is included in the consolidated operating results using the equity method of accounting when the Company is able to exercise significant influence over the operating and financial decisions of the affiliate. Investments in other companies are carried at cost. Use of Estimates The consolidated financial statements of the Company have been prepared in conformity with U.S. GAAP, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Segment Information The Company’s Chief Executive Officer has been identified as the chief operating decision maker. As the chief operating decision maker reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance, the Company has determined that it operates in one operating and reportable segment. Liquidity and Capital Resources The Company has incurred losses from operations since inception. The Company incurred net losses of $16.9 million and $14.4 million for the year ended December 31, 2021 and the period from January 21, 2020 (inception) through December 31, 2020, respectively. Accumulated deficit amounts to $26.4 million and $14.3 million as of December 31, 2021 and 2020, respectively. Net cash used in operating activities was $94.3 million and $1.2 million for the year ended December 31, 2021 and the period from January 21, 2020 (inception) through December 31, 2020, respectively. On July 16, 2021, the Company received $509.0 million in cash, net of redemption and transaction costs as a result of the Business Combination (see Note 4. Business Combination). As of December 31, 2021, the Company has $445.1 million in unrestricted cash. Management expects that the Company’s current source of liquidity including cash, after taking consideration of the current projections of cash flows used in operating and investing activities, will be sufficient to meet its liquidity requirements for at least one year from the issuance date of these consolidated financial statements. Based on the above considerations, the Company’s consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and liquidation of liabilities during the normal course of operations. Risks and Uncertainties

Restatement of Previously Issue

Restatement of Previously Issued Financial Statements	12 Months Ended
	Dec. 31, 2021
Accounting Changes and Error Corrections [Abstract]
Restatement of Previously Issued Financial Statements	Restatement of Previously Issued Financial Statements Management, in concurrence with the Company’s Audit Committee, concluded that the Company's previously issued financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021 and the Company's previously issued unaudited interim financial information included in the Company’s Quarterly Reports on Form 10-Q for the periods ended September 30, 2021 and March 31, 2022 (collectively the “ Affected Financial Statements”) should no longer be relied upon. Details of the restated consolidated financial statements as of and for the fiscal year ended December 31, 2021 are provided below (“Restatement Items”). The Company evaluated the materiality of these errors both qualitatively and quantitatively in accordance with Staff Accounting Bulletin (“SAB”) No. 99, Materiality and SAB No. 108 , Considering the Effects of Prior Year Misstatements in Current Year Financial Statements , and determined the effect of the corrections was material to the Affected Financial Statements. As a result of the material misstatements, the Company has restated its Affected Financial Statements, in accordance with ASC 250, Accounting Changes and Error Corrections . The Restatement Items primarily reflect adjustments to correct errors related to the recognition of revenue and associated balances for China fuel cell electric vehicle ("FCEV") transactions, and adjustments to correct errors related to the recognition of revenue and associated balances for European FCEV transactions. In addition to the correction of the errors discussed above, the Company has corrected for Other Immaterial Errors in all Affected Financial Statements. The Company has also updated all accompanying footnotes and disclosures affected by Restatements Items and Other Immaterial Errors, respectively, within Note 1. Nature of Business and Basis of Presentation, Note 3. Summary of Significant Accounting Policies, Note 4. Business Combination, Note 5. Revenue, Note 6. Inventory, Note 7. Prepaid Expenses and Other Current Assets, Note 8. Property, Plant, and Equipment, net, Note 9. Accrued Liabilities, Note 13. Income Taxes, Note 14. Fair Value Measurements, Note 17. Stockholders' Equity, Note 18. Related Party Transactions, and Note 19. Loss per Share. Restatement Items A. Hyzon China revenue transactions - In July 2022, management discovered and brought to the attention of the Board that certain vehicles in China may not have met the criteria necessary to recognize revenue as of December 31, 2021. The Special Committee was formed to conduct an investigation regarding the Company’s revenue recognition timing and internal controls and procedures for both China and Europe operations. The Company determined that it incorrectly recorded revenue and cost of revenue related to certain FCEVs delivered to customers in China in the fourth quarter of 2021, as the Company did not meet all relevant revenue recognition requirements under U.S. GAAP related to these vehicles. The Company determined that for all Hyzon China revenue transactions the alternative method for revenue recognition was appropriate because the contract existence criteria were not met. For 62 FCEVs, while control of such FCEVs was transferred to the customer prior to December 31, 2021, the Company's obligation to deliver functioning FCEVs was not fully satisfied for revenue recognition purposes as of December 31, 2021, as certain of the FCEVs were not commissioned prior to December 31, 2021. For the other 20 FCEVs, the Company concluded it incorrectly recorded revenue in the fourth quarter of 2021, as it had not yet transferred control of the FCEVs to the customer, nor fully satisfied the obligation to deliver fully functioning FCEVs until the third quarter of 2022. Additionally, for both of the Hyzon China revenue transactions, the Company incorrectly recorded VAT receivable from customers totaling $1.8 million as of December 31, 2021. The Company determined that consideration received from those customers should have first been applied against any VAT receivables and then recorded within contract liabilities until the revenue recognition criteria under the Alternative Method of Revenue Recognition are met. Correction of the errors decreased Revenue by $4.0 million and Cost of revenue by $3.1 million, increased Selling, general and administrative expense by $0.3 million, decreased Prepaid expenses and other current assets by $0.9 million, Other long-term assets by $0.9 million, and Other long-term liabilities by $0.9 million, and increased Inventory by $2.9 million, Accrued liabilities by $0.7 million and Contract liabilities by $2.5 million. B. Hyzon Europe revenue transactions - The Investigation revealed that for five vehicles for which Hyzon Europe recognized revenue in 2021, Hyzon Europe subsequently performed various levels of work and repair efforts on such vehicles after revenue had been recognized. Consequently, the Company conducted an internal accounting review for its European customer arrangements. The Company determined that the accounting analysis previously applied to certain Hyzon Europe customer contracts, which were assumed from Holthausen Clean Technology B.V. in July 2021, was incorrect. More specifically, the Company previously determined that Hyzon Europe had acquired title to work-in-process vehicles from Holthausen Clean Technology B.V. and had been manufacturing and assembling these FCEVs for subsequent sale to customers. Hyzon Europe had instead assumed service contracts related to the retrofit services to convert the customers' own ICE powered vehicles to hydrogen FCEVs. Therefore, the Company revised its revenue recognition analysis and concluded that Hyzon Europe should not have recorded the assumption of these contracts as inventory and associated contract liabilities, and also should have recognized revenue related to these service contract arrangements on an over-time basis utilizing an input method rather than recording revenue at a point in time. Correction of the error decreased Revenue by $2.1 million, Cost of revenue by $2.5 million, Research and development expense by $0.8 million, increased Selling, general and administrative expense by $0.1 million, decreased Inventory by $0.9 million, Accrued liabilities by $0.1 million, and Contract liabilities by $1.9 million. C. Transaction costs - The Company has adjusted its prior allocation of transaction costs incurred in connection with the Business Combination to reflect the allocation of the correct balance of Company incurred transaction costs between the liability classified earnout arrangement and the newly issued equity instruments in the Business Combination in the third quarter of 2021. The adjustment resulted in a reduction of amounts previously allocated to the earnout liability and recognized as expense, offset by an equal increase of transaction costs allocated to the newly issued equity instruments and recorded against additional paid-in capital. Correction of the error decreased Selling, general, and administrative expense and Additional paid-in capital by $3.1 million. Other Immaterial Errors In addition to the Restatement Items, the Company has corrected Other Immaterial Errors. While these Other Immaterial Errors are quantitatively and qualitatively immaterial, individually and in the aggregate, because the Company is correcting for the material errors, the Company has decided to correct these Other Immaterial Errors as well. Additionally, certain items previously reported in specific financial statements captions have been reclassified to conform to the to the current presentation in the consolidated financial statements and the accompanying notes. Correction of miscellaneous immaterial errors decreased Research and development expenses by $0.2 million, increased Selling, general, and administrative expenses by $0.9 million, Accounts receivable by $0.4 million, Accrued liabilities by $0.2 million, Other long-term liabilities by $0.7 million, and Additional paid-in capital by $0.9 million, decreased Inventory by $0.4 million, Prepaid expenses and other current assets by $0.2 million, Accounts payable by $0.4 million, and Contract liabilities by $0.9 million . Summary Impact of Restatement Items and Other Immaterial Errors The following tables present the effect of the Restatement Items, as well as Other Immaterial Errors, on the Company’s consolidated balance sheet for the period indicated (in thousands, except per share): As of December 31, 2021 As Previously Reported Restatement Adjustments Restatement References As Restated ASSETS Current assets Cash $ 445,146 $ — $ 445,146 Accounts receivable 2,598 358 2,956 Related party receivable 264 — 264 Inventory 19,245 1,682 (A), (B) 20,927 Prepaid expenses and other current assets 27,970 (1,118) (A) 26,852 Total current assets 495,223 922 496,145 Property, plant, and equipment, net 14,311 35 14,346 Right-of-use assets 10,265 — 10,265 Investments in equity securities 4,948 — 4,948 Other assets 5,430 (855) (A) 4,575 Total Assets $ 530,177 $ 102 $ 530,279 LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities Accounts payable $ 8,430 $ (450) 7,980 Accrued liabilities 6,026 744 (A), (B) 6,770 Related party payables 3,633 62 3,695 Contract liabilities 11,230 (305) (A), (B) 10,925 Current portion of lease liabilities 1,886 — 1,886 Total current liabilities 31,205 51 31,256 Long term liabilities Lease liabilities 8,830 — 8,830 Private placement warrant liability 15,228 — 15,228 Earnout liability 103,761 — 103,761 Other liabilities 1,296 (157) (A) 1,139 Total liabilities 160,320 (106) 160,214 Commitments and contingencies Stockholders' Equity Common stock, $0.0001 par value; 400,000,000 shares authorized, 247,758,412 and 166,125,000 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively 25 — 25 Additional paid-in capital 403,016 (2,190) (C) 400,826 Accumulated deficit (28,117) 1,705 (26,412) Accumulated other comprehensive income (loss) 373 5 378 Total Hyzon Motors Inc. stockholders’ equity 375,297 (480) 374,817 Noncontrolling interest (5,440) 688 (4,752) Total Stockholders’ Equity 369,857 208 370,065 Total Liabilities and Stockholders’ Equity $ 530,177 $ 102 $ 530,279 The following tables present the effect of the Restatement Items, as well as Other Immaterial Errors, on the Company’s consolidated statement of operations and comprehensive loss for the period indicated (in thousands, except per share amounts): Year Ended December 31, 2021 As Previously Reported Restatement Adjustments Restatement References As Restated Revenue $ 6,049 $ (6,129) (A), (B) $ (80) Operating expense: Cost of revenue 21,191 (5,557) (A), (B) 15,634 Research and development 16,443 (982) (B) 15,461 Selling, general, and administrative 69,792 (1,939) (A), (B), (C) 67,853 Total operating expenses 107,426 (8,478) 98,948 Loss from operations (101,377) 2,349 (99,028) Other income (expense): Change in fair value of private placement warrant liability 4,167 — 4,167 Change in fair value of earnout liability 84,612 — 84,612 Foreign currency exchange loss and other expense (1,452) 43 (1,409) Interest expense, net (5,235) — (5,235) Total other income (expense) 82,092 43 82,135 Net loss $ (19,285) $ 2,392 $ (16,893) Less: Net loss attributable to noncontrolling interest (5,439) 687 (4,752) Net loss attributable to Hyzon $ (13,846) $ 1,705 $ (12,141) Comprehensive loss: Net loss (19,285) 2,392 (16,893) Foreign currency translation adjustment 479 6 485 Comprehensive loss (18,806) 2,398 (16,408) Less: Comprehensive loss attributable to noncontrolling interest (5,349) 688 (4,661) Comprehensive loss attributable to Hyzon $ (13,457) $ 1,710 $ (11,747) Net loss attributable to Hyzon per share: Basic $ (0.07) $ 0.01 $ (0.06) Diluted $ (0.07) $ 0.01 $ (0.06) Weighted average common shares outstanding: Basic 203,897 — 203,897 Diluted 203,897 — 203,897 The following tables present the effect of the Restatement Items, as well as Other Immaterial Errors, on the Company’s consolidated statement of changes in stockholders' equity (in thousands, except share and per share amounts): Common Stock Class A Retained Earnings (Accumulated Deficit) Accumulative Other Comprehensive Income Total Hyzon Motors Inc. Stockholders' Equity (Deficit) Noncontrolling Interest Total Stockholders' Equity Shares Amount Additional Paid-in Capital BALANCE - December 31, 2021 (As Previously Reported) 247,758,412 $ 25 $ 403,016 $ (28,117) $ 373 $ 375,297 $ (5,440) $ 369,857 Cumulative adjustments — — (2,190) 1,705 5 (480) 688 208 BALANCE - December 31, 2021 (As Restated) 247,758,412 $ 25 $ 400,826 $ (26,412) $ 378 $ 374,817 $ (4,752) $ 370,065 The following tables present the effect of the Restatement Items, as well as Other Immaterial Errors, on the Company’s consolidated statement of cash flows (in thousands): Year Ended December 31, 2021 As Previously Reported Restatement Adjustments*** As Restated Cash Flows from Operating Activities: Net loss $ (19,285) $ 2,392 $ (16,893) Adjustments to reconcile net loss to net cash used in operating activities: Depreciation and amortization 1,140 — 1,140 Stock-based compensation 29,148 939 30,087 Loss on extinguishment of convertible notes 107 — 107 Noncash interest expense 5,224 — 5,224 Issuance of warrants 188 — 188 Fair value adjustment of private placement warrant liability (4,167) — (4,167) Fair value adjustment of earnout liability (84,612) — (84,612) Changes in operating assets and liabilities: Accounts receivable (2,614) (357) (2,971) Inventory (19,276) (1,682) (20,958) Prepaid expenses and other current assets (22,970) (1,967) (24,937) Other assets (1,023) 854 (169) Accounts payable 8,164 362 8,526 Accrued liabilities 4,966 (75) 4,891 Related party payables (290) 63 (227) Contract liabilities 8,684 634 9,318 Other liabilities 1,425 (279) 1,146 Net cash used in operating activities (95,191) 884 (94,307) Cash Flows from Investing Activities: Purchases of property and equipment (14,525) (35) (14,560) Advanced payments for capital expenditures (4,257) 3,085 (1,172) Investment in equity securities (4,826) — (4,826) Investment in non-consolidated affiliates (98) — (98) Net cash used in investing activities (23,706) 3,050 (20,656) Cash Flows from Financing Activities: Proceeds from issuance of common stock, net of transaction costs — — — Proceeds from Business Combination, net of redemption and transaction costs 512,936 (3,943) 508,993 Payment for purchase of Horizon IP (6,900) — (6,900) Exercise of stock options 532 — 532 Payment of finance lease liability (203) — (203) Debt issuance costs (133) — (133) Repurchase of warrants (540) — (540) Deferred transaction costs — — — Proceeds from issuance of convertible notes 45,000 — 45,000 Net cash provided by financing activities 550,692 (3,943) 546,749 Effect of exchange rate changes on cash 431 9 440 Net change in cash and restricted cash 432,226 — 432,226 Cash—Beginning 17,139 — 17,139 Cash and restricted cash—Ending $ 449,365 $ — $ 449,365 Supplemental schedule of non-cash investing activities and financing activities: Conversion of Legacy Hyzon Common Stock 73 — 73 Recognition of earnout liability in Business Combination 188,373 — 188,373 Recognition of Private Placement Warrant liability in Business Combination 19,395 — 19,395 Horizon IP Agreement - Fee 10,000 — 10,000 Conversion of convertible notes for common stock 50,198 — 50,198 Acquisitions of property and equipment included in current liabilities 61 — 61 *** The adjustments within the consolidated statement of cash flows for the year ended December 31, 2021 were due to the reconciliation of the changes in account balances used in preparing the statement of cash flows resulting from the various error corrections included in the above financial statements.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2021
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Revenue The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers ("ASC 606"). Revenue is based on the amount of transaction price to which the Company is entitled, subject to the allocation of the transaction price to distinct performance obligations. The Company recognizes revenue when its customer obtains control of promised goods or services in an amount that reflects the consideration for which the Company expects to receive in exchange for those goods or services. To determine revenue recognition, the Company performs the following five steps: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract and (5) recognize revenue when (or as) the entity satisfies a performance obligation. When it determines it is not probable that it will collect all of the consideration to which it will be entitled under a customer contract, the Company concludes the contract existence criteria under ASC 606 are not met. In these cases, the Company recognizes revenue to the extent of consideration received provided the amounts are non-refundable, the Company has transferred control of the goods or services to which the consideration relates, the Company has stopped transferring goods or services, and there is no obligation to transfer additional services ("Alternative Method for Revenue Recognition"). The Company recognizes the incremental costs of obtaining contracts, including commissions, as an expense when incurred as the contractual period of the Company's arrangements are expected to be one year or less. Amounts billed to customers related to shipping and handling are classified as revenue, and the Company has elected to recognize the cost for freight and shipping when control over vehicles, parts, or accessories has transferred to the customer as an expense in cost of revenue. Product Sales The Company enters into sales contracts with customers for the purchase of the Company’s products and services including fuel cell systems, FCEVs, parts, product support, and other related services. The Company considers order confirmations or purchase orders, which in some cases are governed by master vehicle supply agreements, to be contracts with a customer. The Company recognizes revenue when it satisfies a performance obligation by transferring control of product(s) or service to a customer. On standard vehicle sales contracts, revenues are recognized at a point in time when customers obtain control of the vehicle, which among other indicators, is generally when transfer of title and risks and rewards of ownership of goods have passed and when the Company has a present right to payment. Provisions for warranties are made at the time of sale. Sales, value-added, and other taxes collected concurrent with revenue producing activities are excluded from revenue. Payment terms for sales of FCEVs to certain customers have included installment billing terms to fund the Company’s working capital requirements. The Company does not adjust the transaction price for a significant financing component when the performance obligation is expected to be fulfilled within a year as the amount is not material. In China, the Company has granted extended payment terms to customers, which resulted in the Company concluding collection of all of the consideration under the contract is not probable. As a result, the contract existence criteria is not met and revenue is recognized under the Alternative Method of Revenue Recognition, which may not be in the same period that control of the related goods is transferred to the customers (see Note 5. Revenue). The Company does not include a right of return on its products other than rights related to standard warranty provisions that permit repair or replacement of defective goods. Retrofit Services The Company also enters into contracts with customers to retrofit ICE vehicles to FCEVs. In general, the customer controls any work in process arising from the Company’s performance; and the Company has in effect agreed to sell its rights to the work as it performs on a continuous basis. Revenue from these contracts is generally recognized over time utilizing an input method. Under the input method, the extent of progress towards completion is measured based on the ratio of normal costs incurred to date to the total estimated costs at completion of the performance obligation. Unexpected amounts of wasted materials, labor or other resources are excluded from the cost-to-cost measure of progress. The Company believes that this method is the most accurate representation of the Company's performance, because it directly measures the value of the services transferred to the customer over time as the Company incurs costs on its contracts. Contract costs include all direct materials, labor, and indirect costs related to contract performance, which may include indirect labor, supplies, tools, repairs and depreciation costs. The amount of revenue recognized for these contracts in a period is dependent on our ability to estimate total contract costs. The Company continually evaluates its estimates of total contract costs based on available information and experience. Accounts Receivable Accounts receivable primarily arise from sales of FCEVs to customers in the normal course of business. They are stated at the amount billed or billable to customers, net of any allowance for credit losses. An allowance for credit losses accounts is established through a charge to Selling, general, and administrative (“SG&A”) expenses. The allowance is an estimate of the amount required to absorb probable losses on receivables that may become uncollectible. The receivables are written-off when amounts due are determined to be uncollectible. Since the date of inception, the Company has not experienced significant losses or past due amounts on trade and other receivables. As of December 31, 2021 and 2020 the Company recorded no allowance for credit losses. Concentration of Supply Risk The Company is subject to risks related to its dependence on suppliers as some of the components and technologies used in the Company’s products are produced by a limited number of sources or contract manufacturers. The inability of these suppliers to deliver necessary components in a timely manner, at prices and quantities acceptable to the Company may cause the Company to incur transition costs to other suppliers and could have a material and adverse impact on the Company’s business, growth and financial and operating results. The Company currently relies and expects to rely on Horizon as a single source supplier of hydrogen fuel cell systems until completion of Hyzon hydrogen fuel cell manufacturing facilities. Warranties In most cases, products that customers purchase from the Company are covered by a one Leases The Company accounts for leases in accordance with ASC Topic 842, Leases (“ASC 842”). The Company determines if an arrangement is or contains a lease at contract inception. The Company recognizes a right of use ("ROU") asset and a lease liability (i.e., finance obligation) at the lease commencement date. For operating and finance leases, the lease liability is initially measured at the present value of the unpaid lease payments at the lease commencement date and is subsequently measured at amortized cost using the effective interest method. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The Company has operating or finance leases for office space, research and development space, warehouse and manufacturing space. For finance leases, lease liabilities are increased by interest and reduced by payments each period, and the right of use asset is amortized over the lease term. For operating leases, interest on the lease liability and the amortization of the right of use asset results in straight-line rent expense over the lease term. The lease term for all of the Company’s leases includes the noncancelable period of the lease, plus any additional periods covered by either a Company option to extend (or not to terminate) the lease that the Company is reasonably certain to exercise, or an option to extend (or not to terminate) the lease controlled by the lessor. Lease payments included in the measurement of the lease liability comprise fixed payments, and the exercise price of a Company option to purchase the underlying asset if the Company is reasonably certain to exercise the option. Variable lease payment amounts that cannot be determined at the commencement of the lease, such as increases in lease payments based on changes in index rates or usage, are not included in the ROU assets or liabilities. These are expensed as incurred and recorded as variable lease expense. The Company has lease agreements with lease and non-lease components, which are accounted for as a single lease component. The Company has elected not to recognize leases with original lease terms of 12 months or less (“short-term leases”) on the Company’s balance sheet. Short-term lease cost was immaterial for the year ended December 31, 2021 and for the period from January 21, 2020 (inception) through December 31, 2020. Cash & Restricted Cash Cash includes cash held in banks. The Company deposits its cash with high credit quality institutions to minimize credit risk exposure. Restricted cash is pledged as security for letters of credit or other collateral amounts established by the Company for certain lease obligations, corporate credit cards, and other contractual arrangements. The Company presents restricted cash separately from unrestricted cash on the Consolidated Balance Sheets, included within Other assets. As of December 31, 2021, the Company has $4.2 million in restricted cash. The Company had no restricted cash as of December 31, 2020. Inventory Inventories are stated at the lower of cost and net realizable value ("NRV"). Cost is determined using the first-in, first-out method ("FIFO") for all inventories. The Company writes-down inventory for any excess or obsolete inventoried or when the Company believes that the net realizable value of inventories is less than the carrying value. Inventory write-downs are recognized in Cost of revenue. Property, Plant, and Equipment Property, plant, and equipment is stated at cost less accumulated depreciation and amortization. Major improvements that extend the useful life or add functionality are capitalized. Repair and maintenance costs are expensed as incurred. The cost of properties sold or otherwise disposed of and the related accumulated depreciation and amortization are eliminated from the balance sheet accounts at the time of disposal and resulting gains and losses are included as a component of operating income. Depreciation is recorded on a straight-line basis over the shorter of the lease term or the following estimated useful lives of the assets. Years Buildings and improvements 30 years Leasehold improvements 5 years Machinery and equipment 7 years Software 3 - 5 years Vehicles 5 years Investments in Equity Securities The Company owns common shares, participation rights, and options to purchase additional common shares in certain private companies. The Company does not have control and does not have the ability to exercise significant influence over operating and financial policies of these entities. The investment does not have a readily determinable fair value and thus the investment is measured at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment. Changes in the fair values of the investments are recorded in Other income (expense) on the Consolidated Statements of Operations and Comprehensive Loss (see Note 11. Investments in Equity Securities). Investments in Non-consolidated Affiliates Equity method investments are recorded at original cost and adjusted periodically to recognize (i) the Company’s proportionate share of the investees’ net income or losses after the date of investment, (ii) additional contributions made and dividends or distributions received, and (iii) impairment losses resulting from adjustments to fair value. The Company assesses the potential impairment of equity method investments and determines fair value based on valuation methodologies, as appropriate, including the present value of estimated future cash flows, estimates of sales proceeds, and market multiples. If an investment is determined to be impaired and the decline in value is other than temporary, a write-down is recorded as appropriate. Fair Value Measurements Financial assets and liabilities are categorized, based on the inputs to the valuation technique, into a three-level fair value hierarchy. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets and liabilities and lowest priority to unobservable inputs. Observable market data, when available, is required to be used in making fair value measurements. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement. Warrant liabilities The Company accounts for warrants as either equity-classified or liability-classified instruments based on an assessment of the warrant’s specific terms and applicable authoritative guidance in FASB ASC 480, Distinguishing Liabilities from Equity (“ASC 480”) and ASC 815-40, Derivatives and Hedging—Contracts in Entity’s Own Equity (“ASC 815”). The assessment considers whether the warrants are freestanding financial instruments pursuant to ASC 480, meet the definition of a liability pursuant to ASC 480, and whether the warrants meet all of the requirements for equity classification under ASC 815, including whether the warrants are indexed to the Company’s own common stock, among other conditions for equity classification. For issued or modified warrants that meet all of the criteria for equity classification, the warrants are required to be recorded as a component of additional paid-in capital at the time of issuance. For issued or modified warrants that do not meet all the criteria for equity classification, the warrants are required to be recorded at their initial fair value on the date of issuance and adjusted to the current fair value at each balance sheet date thereafter. Changes in the estimated fair value of the warrants are recognized as a non-cash gain or loss on the Consolidated Statements of Operations and Comprehensive Loss (see Note 17. Stockholders' Equity). Earnout liability As a result of the Business Combination, the Company recognized earnout shares to Legacy Hyzon’s common stockholders as a liability. Pursuant to ASC 805-10, Business Combinations (“ASC 805”) the Company determined that the initial fair value of the earnout shares should be recorded as a liability with the offset recorded to additional paid-in capital and with subsequent changes in fair value recorded in the Consolidated Statements of Operations and Comprehensive Loss at each reporting period. The earnout shares to other holders of outstanding equity awards are accounted for under ASC 718, Stock Compensation (“ASC 718”), as these earnout shares are compensatory in nature and relate to services provided or to be provided to the Company. Impairment of Long-Lived Assets The Company assesses the recoverability of its long-lived assets whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The assessment of possible impairment is based on the ability to recover the carrying value of the assets from expected undiscounted future cash flows from operations. An impairment charge would be recognized equal to the amount by which the carrying amount exceeds the estimated fair value of the asset. Fair value is determined using either the market or sales comparison approach, cost approach or anticipated cash flows discounted at a rate commensurate with the risk involved. The Company did not record any impairment loss for the year ended December 31, 2021, nor for the period from January 21, 2020 (inception) through December 31, 2020. Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the period that includes the enactment date. A valuation allowance is recorded to reduce the carrying amounts of deferred tax assets if it is more likely than not that such assets will not be realized. The Company accounts for uncertain tax positions in accordance with ASC Topic 740, Income Taxes (“ASC 740”), which clarifies the accounting for uncertainty in tax positions. This interpretation requires that an entity recognizes in its consolidated financial statements the impact of a tax position, if that position is more likely than not of being sustained upon examination, based on the technical merits of the position. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company has elected to classify interest and penalties related to unrecognized tax benefits, if and when required, as part of income tax expense in the Consolidated Statements of Operations and Comprehensive Loss. Foreign Currency Translation and Transactions The functional and reporting currency of each of the Company’s foreign subsidiaries is determined based on the primary currency in which they operate and appropriate economic factors. For the translation from the applicable foreign currencies to U.S. dollars, period-end exchange rates are utilized for balance sheet accounts and weighted average exchange rates for each period for revenue and expense accounts. The cumulative translation adjustments are recognized as a component of Accumulated other comprehensive loss. For all transactions denominated in a currency other than a subsidiary’s functional currency, exchange rate gains and losses are recognized in earnings in the period incurred. Net foreign currency transaction losses of $1.3 million and a negligible amount were recorded for the year ended December 31, 2021 and for the period from January 21, 2020 (inception) through December 31, 2020, respectively. These amounts are recorded in Other income (expense) on the Consolidated Statements of Operations and Comprehensive Loss. Stock-based Compensation Incentive plans that provide for the granting of stock-based compensation to employees, directors, and consultants are described in Note 16. Stock-based Compensation Plans. The Company recognizes compensation expense for its stock-based compensation programs, which can include stock options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”) and performance awards. The fair value of stock option awards with only service and/or performance conditions is estimated on the grant or offering date using the Black-Scholes option-pricing model. Assumptions used to estimate compensation expense include fair value of common stock, expected price volatility of common stock, expected term, risk-free interest rates, and expected dividend yield. The fair value of RSUs is measured on the grant date based on the closing fair market value of the Company's common stock. Stock-based compensation expense is recognized on a straight-line basis over the requisite service period, net of actual forfeitures in the period. For performance-based awards, stock-based compensation expense is recognized over the expected performance achievement period of individual performance milestones when the achievement of each individual performance milestone becomes probable. In the period in which the qualifying event is probable, the Company will record a cumulative one-time stock-based compensation expense determined using the grant-date fair values. Research and Development Research and development costs arise from ongoing activities associated with improving existing products and advancing development of new and next generation products. Research and development costs that do not meet the requirements to be recognized as an asset, as the associated future benefits are uncertain and no alternative future use is identified, are expensed as incurred. Selling, General, and Administrative Expense Selling, general, and administrative expense consist of personnel costs, depreciation and amortization, sales and marketing costs, and facilities expense. These costs are recognized when incurred. Comprehensive Income (Loss) Comprehensive income (loss) consists of two components, net income (loss) and comprehensive income (loss). Foreign currency translation adjustments are reported in Comprehensive income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss). Variable Interest Entity Arrangements The Company performs both qualitative and quantitative analysis of its variable interests, including loans, guarantees, and equity investments, to determine if the Company has any variable interests in variable interest entities. Qualitative analysis is based on an evaluation of the design of the entity, its organizational structure including decision making ability, and financial agreements. Quantitative analysis is based on the entity’s forecasted cash flows. U.S. GAAP requires a reporting entity to consolidate a variable interest entity when the reporting entity has a variable interest that provides it with a controlling financial interest in the variable interest entity. The entity that consolidates a variable interest entity is referred to as the primary beneficiary of that variable interest entity. The Company uses qualitative and quantitative analyses to determine if it is the primary beneficiary of variable interest entities. In 2020, Hyzon entered into a joint venture agreement (the “JV Agreement”) with Holthausen Clean Technology Investment B.V. (“Holthausen”) (together referred to as the “Shareholders”) to establish a venture in the Netherlands called Hyzon Motors Europe B.V. (“Hyzon Europe”). The Shareholders combined their resources in accordance with the JV Agreement to mass commercialize fuel cell trucks within the European Union and nearby markets such as the United Kingdom, the Nordic countries, and Switzerland through Hyzon Europe. Hyzon and Holthausen have 50.5% and 49.5% ownership interest in the equity of Hyzon Europe, respectively. The Company determined it is the primary beneficiary of Hyzon Europe because it serves as the manager of the Hyzon Europe’s operations, for which it owns 50.5%, thereby giving the Company the power to direct activities of the Hyzon Europe that most significantly impact its economic performance. The Company also has exposure to the losses of the entity and the right to receive benefits from the entity that could potentially be significant to the entity as a result of its equity interest. The Consolidated Balance Sheets after elimination of any intercompany transactions and balances include assets of $49.5 million and $1.0 million as of December 31, 2021 and 2020, respectively, and liabilities of $13.1 million and $1.2 million as of December 31, 2021 and 2020, respectively, related to Hyzon Europe. The noncontrolling interest represents Holthausen’s ownership interest in Hyzon Europe. On October 18, 2021, the Company’s wholly owned subsidiary, Hyzon Automotive Technology Co., Ltd. (“Hyzon China”) entered into a joint venture agreement (the “Foshan JV Agreement”) with Foshan Zhongbang Earthwork Engineering Co., Ltd. (“FSZB”) and a private citizen of People’s Republic of China (together referred to as the “Foshan JV Shareholders”) forming Foshan Hyzon New Energy Technology Co., Ltd. (“Hyzon Foshan”). Foshan JV Shareholders engages in the commercial sales, operation, leasing and promotion of fuel cell muck-truck, mixer-truck and other construction vehicles within Foshan City, Guangdong Province. Hyzon, FSZB, and the private citizen shareholder have a 51.0%, 44.0%, and 5.0% interest in the equity of the Company, respectively. The Company determined it is primary beneficiary of Hyzon Foshan, with 51.0% control of shareholder voting, thereby giving the Company the power to direct activities of Hyzon Foshan. The Company also has exposure to the losses of the entity and the right to receive benefits from the entity that could potentially be significant to the entity as a result of its equity interest. The Consolidated Balance Sheets after elimination of any intercompany transactions and balances include assets of $1.6 million and de minimis liabilities as of December 31, 2021, related to Hyzon Foshan. The noncontrolling interest represents the other joint venture partners’ ownership interest in Hyzon Foshan. Net Income (Loss) Per Share Basic net income (loss) per share attributable to common stockholders is computed by dividing net income (loss) (the numerator) by the weighted average number of common shares outstanding for the period (the denominator). Diluted net income (loss) per share attributable to common stockholders is computed by dividing net income (loss) by the weighted average number of common shares and all potential common shares outstanding, unless the impact would be anti-dilutive, during each period presented. The diluted net income (loss) per share attributable to common stockholders’ calculation recognizes the dilution that would occur if stock options, other stock-based awards or other contracts to issue common stock were exercised or converted into shares using the treasury stock method (see Note 19. Loss per Share). Recent Accounting Pronouncements Recently issued accounting pronouncements not yet adopted In October 2021, the FASB issued ASU No. 2021-08, Business Combination (Topic 805) : Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This ASU requires an acquirer in a business combination to recognize and measure contract assets and contract liabilities (deferred revenue) from acquired contracts using the revenue recognition guidance in ASC 606. At the acquisition date, the acquirer applies the revenue model as if it had originated the acquired contracts. The ASU is effective for annual periods beginning after December 15, 2022, including interim periods within those fiscal years. Adoption of the ASU should be applied prospectively to business combinations occurring on or after the effective date of the amendments. Early adoption is permitted, including adoption in an interim period. The Company is in the process of assessing the impact of this guidance on its consolidated financial statements. Recently adopted accounting pronouncements In November 2021, the FASB issued ASU No. 2021-10, Government Assistance (Topic 832) : Disclosures by Business Entities about Government Assistance. This ASU requires business entities to disclose information about government assistance they receive if the transactions were accounted for by analogy to either a grant or a contribution accounting model. The disclosure requirements include the nature of the transaction and the related accounting policy used, the line items on the balance sheets and statements of operations that are affected and the amounts applicable to each financial statement line item and the significant terms and conditions of the transactions, including commitments and contingencies. The ASU is effective for annual periods beginning after December 15, 2021. Early application of the amendments is permitted. The disclosure requirements can be applied either retrospectively or prospectively to all transactions in the scope of the amendments that are reflected in the financial statements at the date of initial application and new transactions that are entered into after the date of initial application. The ASU does not have and is currently not expected to have a material impact on the consolidated financial statements.

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
Business Combination	Business CombinationAs discussed in Note 1, on July 16, 2021, Legacy Hyzon consummated the transaction contemplated by the Business Combination. Immediately upon the completion of the Business Combination and the other transactions contemplated by the Business Combination, Legacy Hyzon became a direct, wholly owned subsidiary of DCRB. In connection with these transactions, DCRB changed its name to “Hyzon Motors Inc.” The Business Combination was accounted for as a reverse recapitalization in accordance with U.S. GAAP, with no goodwill or other intangible assets recorded and the net assets of Legacy Hyzon consolidated with DCRB at historical cost. Under this method of accounting, DCRB is treated as the “acquired” company for financial reporting purposes. The reverse recapitalization is retrospectively adjusted in the consolidated statements of changes in stockholders’ equity to reflect the Company’s equity structure for all periods presented. As a result of the Business Combination, each share of common stock of Legacy Hyzon, par value $0.001 per share, was converted to 1.772 shares of Class A common stock (the “Exchange Ratio”), par value $0.0001 per share of the Company, resulting in the issuance of approximately 173.4 million shares of Class A common stock. Additionally, the Company reserved for issuance approximately 21.7 million shares of Class A common stock in respect to outstanding options and RSUs issued in exchange for options, RSUs and warrants of the Company. Immediately prior to the Business Combination, Legacy Hyzon issued to Hymas approximately 4.1 million shares of Legacy Hyzon common stock without any consideration, which was converted to approximately 7.2 million of Class A common stock. DCRB held subscription agreements with certain investors to issue and sell an aggregate of 35,500,000 shares of Class A common stock of DCRB for $10.00 per share for an aggregate commitment of $355,000,000 (the “PIPE Financing”). At the closing of the Business Combination, DCRB consummated the PIPE Financing, and those proceeds became part of the Company’s capital. Pursuant to the terms of the Convertible Notes described in Note 10, immediately prior to the Business Combination the outstanding principal of $45 million as well as the accrued interest on the Convertible Notes automatically converted into shares of the Company at a price per share equal to 90% of the price per share paid by the PIPE Financing investors, and upon the closing, converted into 5,022,052 shares of common stock of the post-combination company. In accordance with an agreement executed in July 2020, Ascent Funds Management LLC (“Ascent”) was granted options to purchase shares of Legacy Hyzon common stock (the “Ascent Options”) at an exercise price of $2.73 per share. Immediately prior to the consummation of the Business Combination, the Ascent Options were automatically exercised in full on a cashless basis into approximately 3.9 million shares of Legacy Hyzon common stock, which converted into approximately 6.9 million shares of Class A common stock in connection with the Business Combination. Immediately after giving effect to the Business Combination, PIPE Financing, Convertible Note conversion, and Ascent Options exercise described above, there were 246,994,209 shares of Class A common stock of the Company issued and outstanding. The number of shares of common stock issued immediately following the consummation of the Business Combination: Shares Common Stock of DCRB 20,483,179 DCRB Founders 5,643,125 Total DCRB 26,126,304 Conversion of Ascent options (post-cashless exercise) 6,871,667 Conversion of convertible notes 5,022,052 PIPE shares 35,500,000 Reverse recapitalization transaction 73,520,023 Legacy Hyzon Shares after conversion (1) 173,474,186 Total shares of Common Stock immediately after Business Combination 246,994,209 (1) The number of Legacy Hyzon shares was determined from the 97,897,396 shares of Legacy Hyzon common stock outstanding immediately prior to the closing of the Business Combination converted at the Exchange Ratio of 1.772. All fractional shares were rounded down. The following table reconciles the elements of the Business Combination to the Consolidated Statements of Cash Flows for the year ended December 31, 2021 (in thousands): Recapitalization Cash – DCRB trust and cash, net of redemptions and liabilities recorded by DCRB of $24.9 million $ 179,727 Cash – PIPE Financing, net of transaction costs of $14.2 million 340,797 Less: transaction costs allocated to equity (11,531) Effect of Business Combination, net of redemption and transaction costs $ 508,993 The Company issued equity classified common shares and certain liability classified earnout shares. Transaction costs of $3.3 million attributable to the liability classified earnout shares were expensed. The rest was attributable to the equity classified common shares and recorded as a reduction to Additional paid-in capital in the Consolidated Balance Sheets. The following table reconciles the elements of the Business Combination to the Consolidated Statements of Changes in Stockholders’ Equity for the year ended December 31, 2021 (in thousands): Recapitalization Cash – DCRB trust and cash, net of redemptions and liabilities recorded by DCRB of $24.9 million $ 179,727 Cash – PIPE Financing, net of transaction costs of $14.2 million 340,797 Conversion of convertible notes into common stock 50,198 Recognize earnout liability (188,373) Recognize Private Placement Warrants liability (19,395) Recapitalization of Legacy Hyzon common shares 75 Less: transaction costs allocated to equity (11,531) Effect of Business Combination, net of redemption and transaction costs $ 351,498 Warrants On October 22, 2020, DCRB consummated the Initial Public Offering of 22,572,502 units and each unit consists of one share of Class A common stock and one-half of one public warrants (the “Public Warrants”). Simultaneously with the closing of the Initial Public Offering, DCRB consummated the private sale of 6,514,500 warrants (the “Private Placement Warrants”), including 514,500 warrants as a result of the underwriters’ partial exercise of their over-allotment option on November 12, 2020, at a price of $1.00 per Private Placement Warrant in a private placement to Decarbonization Plus Acquisition Sponsor, LLC (the “Sponsor”), DCRB’s independent directors and an affiliate of DCRB’s chief executive officer. At the closing of the Business Combination, DCRB and the Sponsor entered into a note agreement, whereby the Sponsor agreed to loan DCRB an aggregate of $1,500,000 to cover working capital requirements. The note agreement converted at the Business Combination date into 1,500,000 additional Private Placement Warrants. Upon the closing of the Business Combination, Hyzon assumed these outstanding warrants. See Note 17. Stockholders' Equity. Earnout Following the closing of the Business Combination, holders of the Company’s legacy common stock and outstanding equity awards (including warrant, stock option and RSU holders) were granted the right to receive up to an aggregate amount of 23,250,000 shares of Class A common stock that would vest in three tranches of (i) 9,000,000, (ii) 9,000,000 and (iii) 5,250,000 shares if the trading price of the common stock of the Company achieves $18, $20, and $35, respectively, as its last reported sales price per share for any 20 trading days within any 30 consecutive trading day period within five years following the closing date of the Business Combination, provided that in no event will the issuance of the 5,250,000 earnout shares occur prior to the one-year anniversary of the closing date. Upon forfeiture of underlying unvested equity awards prior to occurrence of targeted trading price noted above, the associated earnout shares shall be allocated pro-rata among the remaining eligible Company’s common stock and equity awards holders. The Company recognized earnout shares to Legacy Hyzon’s common stockholders as a liability. The earnout liability was $103.8 million and $188.4 million as of December 31, 2021 and at the close of the Business Combination, respectively.

Revenue

Revenue	12 Months Ended
	Dec. 31, 2021
Revenue	Revenue For the year ended December 31, 2021, the Company recorded $0.1 million of revenue related to retrofit services performed by Hyzon Europe, offset by the recognition of $(0.2) million of contra revenue associated with the issuance of warrants to a customer for FCEV deliveries in China. During 2021, the Company transferred control of 62 FCEVs to a customer in China, and recognized cost of revenue related to these FCEVs in the consolidated statement of operations in 2021. The Company did not generate revenue for the period from January 21, 2020 (inception) to December 31, 2020. As discussed in Note 2. Restatement of Previously Issued Financial Statements, control was transferred to a customer for 62 FCEVs delivered prior to December 31, 2021 in China. As of December 31, 2021 the Company collected $2.5 million of consideration related to this arrangement, which is non-refundable and recognized within Contract liabilities because the criteria to recognize revenue under the Alternative Method of Revenue Recognition were not met. Contract Balances Contract liabilities relate to the advance consideration invoiced or received from customers for products and services prior to satisfying a performance obligation or in excess of amounts allocated to a previously satisfied performance obligation. The current portion of contract liabilities is recorded within Contract liabilities in the Consolidated Balance Sheets and totaled $10.9 million and $2.6 million as of December 31, 2021, and 2020, respectively. The long term portion of contract liabilities is recorded within Other liabilities in the Consolidated Balance Sheets and totaled $1.0 million as of December 31, 2021. The Company did not have any long term contract liabilities as of December 31, 2020. Significant changes in the contract liabilities balances including cash received from 62 FCEV arrangement in China are as follows (in thousands): Year Ended For the period Contract liabilities - beginning of period $ 2,608 $ — Increases during the period 9,257 2,608 Revenue recognized, included in the contract liability balance in the beginning of the period — — Contract liabilities - end of period $ 11,865 $ 2,608 Remaining Performance Obligations The transaction price associated with remaining performance obligations for commercial vehicles and other contracts with customers was $19.7 million and $10.0 million as of December 31, 2021 and 2020, respectively. The Company expects to recognize substantially all its remaining performance obligations as revenue over the next 12 months.

Inventory

Inventory	12 Months Ended
	Dec. 31, 2021
Inventory Disclosure [Abstract]
Inventory	Inventory Inventory consisted of the following (in thousands): December 31, December 31, Raw materials $ 16,099 $ — Work in process 4,828 — Total inventory $ 20,927 $ —

Prepaid Expenses and Other Curr

Prepaid Expenses and Other Current Assets	12 Months Ended
	Dec. 31, 2021
Prepaid Expenses and Other Current Assets	Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following (in thousands): December 31, December 31, Deposit for fuel cell components (see Note 18) $ 5,008 $ — Vehicle inventory deposits 10,171 577 Production equipment deposits 1,169 — Other prepaid expenses 3,266 271 Prepaid insurance 5,079 — VAT receivable from government 2,159 — Total prepaid expenses and other current assets $ 26,852 $ 848

Property, Plant, and Equipment,

Property, Plant, and Equipment, net	12 Months Ended
	Dec. 31, 2021
Property, Plant, and Equipment, net	Property, Plant, and Equipment, net Property, plant, and equipment, net consisted of the following (in thousands): December 31, December 31, Land and building $ 2,818 $ — Machinery and equipment 8,827 371 Software 507 — Leasehold improvements 746 — Construction in progress 2,139 60 Total Property, plant, and equipment 15,037 431 Less: Accumulated depreciation and amortization (691) (13) Property, plant and equipment, net $ 14,346 $ 418

Accrued Liabilities

Accrued Liabilities	12 Months Ended
	Dec. 31, 2021
Accrued Liabilities [Abstract]
Accrued Liabilities	Accrued Liabilities Accrued liabilities consisted of the following (in thousands): December 31, December 31, Payroll and payroll related expenses $ 2,250 $ 54 Accrued professional fees 2,450 900 Other accrued expenses 2,070 108 Accrued liabilities $ 6,770 $ 1,062

Convertible Notes

Convertible Notes	12 Months Ended
	Dec. 31, 2021
Convertible Notes	Convertible Notes On August 24, 2020, Legacy Hyzon entered into two Convertible Note Purchase Agreements (the “Agreements”), each with a separate purchaser. Each agreement authorized the issuance and sale of convertible promissory notes (the “2020 Notes”). The 2020 Notes issued on August 24, 2020 had a combined principal amount of $0.5 million and each bore an interest rate of 10%, payable semi-annually in cash or in the form of the 2020 Notes. The 2020 Notes were set to mature one year after the issuance date (i.e., August 24, 2021), unless converted at a prior date. Upon the consummation of an initial closing of a Qualified Financing, as defined, the 2020 Notes were convertible into a variable number of shares of the series or class of capital stock sold in the Qualified Financing equal to the par value of the 2020 Notes, either automatically or at the option of Legacy Hyzon. A Qualified Financing is defined as a private round of equity financing consummated by Legacy Hyzon resulting in aggregate proceeds of at least $10 million including the aggregate principal balance of the 2020 Notes as converted, with a minimum pre-money valuation equal to at least $175 million. On October 19, 2020, Legacy Hyzon closed a Qualified Financing and the 2020 Notes were converted into 250,000 common shares. In February 2021, the Company entered into a Convertible Notes Purchase Agreement with certain investors for the purchase and sale of $45 million in Convertible Notes (the “Convertible Notes”). The Convertible Notes accrued interest at an annual rate of 1% commencing upon issuance and compounding semi-annually on each August 1 and February 1. Interest was payable by increasing the principal amount of the Convertible Notes (with such increased amount accruing interest as well) on each interest payment due date. As the Convertible Notes contained various settlement outcomes, the Company evaluated each scenario for accounting purposes. The conversion features settled at discounts upon certain financing events were determined to be redemption features and were evaluated as embedded derivatives and bifurcated from the Convertible Notes due to the substantial premium to be paid upon redemption. At issuance, option-based features were determined to have a de minimis fair value, and non-option-based features were bifurcated assuming the issuance fair value was zero. Changes in the derivative liability fair values were reported in operating results each reporting period, prior to the close of the Business Combination. For the period from February 2021 to the close date of the Business Combination, the Company recorded $0.2 million of interest expense related to the stated interest for the Convertible Notes and $5.0 million related to the change in the value of the bifurcated embedded derivative within interest expense. Upon the closing, immediately prior to the Business Combination, the Convertible Notes and the accrued interest automatically converted into 5,022,052 shares of common stock of the Company (see Note 4. Business Combination).

Investments in Equity Securitie

Investments in Equity Securities	12 Months Ended
	Dec. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments in Equity Securities	Investments in Equity Securities The Company has certain equity security investments which are included in Investments in equity securities on the Consolidated Balance Sheets. The Company owns common shares, participation rights, and options to purchase additional common shares in Global NRG H2 Limited (“NRG”). The Company does not have control and does not have the ability to exercise significant influence over the operating and financial policies of this entity. The Company’s investment totaled $0.1 million as of December 31, 2020 and the Company increased its investment to $2.5 million as of December 31, 2021.

Investments in Non-consolidated

Investments in Non-consolidated Affiliates	12 Months Ended
	Dec. 31, 2021
Equity Method Investments and Joint Ventures [Abstract]
Investments in Non-consolidated Affiliates	Investments in Non-consolidated Affiliates Investments in non-consolidated affiliates is comprised of the Company's interests in partially-owned affiliates of which the Company's ownership percentages range from 25% to 40% as of December 31, 2021. The Company does not control these affiliates but has the ability to exercise significant influence over their operating and financial policies. The Company accounts for them using the equity method of accounting. In July 2021, the Company entered into two joint ventures in the People’s Republic of China. Hyzon China partnered with Jiushuang Tiancheng Motors Service Ltd. (“JSTC”) to form Jiushuang-Hyzon Motor Services, Ltd. (“JSYS”) and partnered with Jiushuang Suda Logistics Ltd. (“JSSD”) to form Jiushuang-Hyzon Logistics, Ltd. (“JSHYS”), (collectively, “Jiushuang JVs”). Jiushuang JVs were established for the purpose of promoting the commercial operation of fuel cell vehicles in the Shanghai, China market. JSYS will be focused on operation of fuel cell buses and JSHYS will be focused on the operation of fuel cell logistics vehicles. The Company’s direct ownership interest in the non-consolidated joint ventures JSYS and JSHYS are 40% and 25%, respectively.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2021
Income Taxes	Income Taxes The Company is subject to income taxes in the U.S. and several non-U.S. jurisdictions. There was no provision for income taxes for the year ended December 31, 2021 and for the period from January 2020 (inception) to December 31, 2020, because the Company is generating tax losses, and the Company’s net deferred tax assets continue to be fully offset by a valuation allowance. Income (loss) before income taxes is summarized as follows (in thousands): Year Ended For the period US $ 14,380 $ (13,863) Non-US (31,273) (513) Total $ (16,893) $ (14,376) A reconciliation of the Company’s effective income tax rate is as follows: Year Ended For the period Federal tax at a statutory rate 21.0 % 21.0 % Earnings taxed at other than Federal statutory rate 7.8 0.3 Non-deductible interest expense (6.5) 0.0 Section 162(m) (41.6) 0.0 Change in fair value of earnout liability 110.4 0.0 Transaction costs 6.1 0.0 Deferred tax adjustments 3.7 0.0 Tax basis in acquired IP 13.2 0.0 Other 4.1 0.0 Change in valuation allowance (118.2) (21.3) Income tax provision 0.0 % 0.0 % Deferred income tax assets and liabilities are summarized as follows (in thousands): December 31, December 31, Deferred income tax assets: Net operating loss carryforwards $ 15,124 $ 931 Revenue recognition basis difference 3,658 — Stock-based compensation 1,072 2,097 Lease liabilities 2,550 378 Tax basis in acquired IP 2,078 — Other accruals 1,117 — Deferred income tax assets - total 25,599 3,406 Deferred income tax liabilities: Property and equipment (144) (4) Right of use assets (2,450) (348) Deferred income tax liabilities - total (2,594) (352) Deferred income tax assets, net 23,005 3,054 Less: Valuation allowance 23,005 3,054 Deferred income taxes, net $ — $ — Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes as well as carryforward tax losses. At December 31, 2021, the Company had U.S. federal and foreign net operating loss carryforwards (“NOLs”) of $53.0 million and $14.4 million, respectively, to be used to offset future taxable income. The entire $53.0 million of U.S federal losses and $12.0 million of foreign losses can be carried forward indefinitely; the remaining $2.4 million of foreign losses expire on various dates through 2026. Under the provisions of Section 382 of the Internal Revenue Code (“IRC”), the U.S. net operating loss and credit carryforwards and other tax attributes may be subject to limitation if there has been a significant change in ownership of the Company, as defined by the IRC. In connection with the Business Combination and the resulting change in ownership, the future utilization of NOL’s maybe be subject to limitation under Section 382 in the United States, as well as in some foreign jurisdictions. In assessing the realizability of deferred tax assets, the Company considers, within each taxing jurisdiction, whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. Based on the consideration of the weight of both positive and negative evidence, the Company has determined it is more likely than not that the deferred tax assets as of December 31, 2021 will not be realized. As such, a valuation allowance has been provided against each entity’s net deferred tax assets. The following table summarizes the activity related to the Company’s valuation allowances (in thousands): December 31, December 31, Valuation Allowances - beginning of period $ 3,054 $ — Local currency increase in reserve 19,951 3,054 Valuation Allowances - end of period $ 23,005 $ 3,054

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 14. Fair Value Measurements The Company follows the guidance in ASC 820, Fair Value Measurement . For assets and liabilities measured at fair value on a recurring and nonrecurring basis, a three-level hierarchy of measurements based upon observable and unobservable inputs is used to arrive at fair value. The Company uses valuation approaches that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible. The Company determines fair value based on assumptions that market participants would use in pricing an asset or liability in the principal or most advantageous market. When considering market participant assumptions in fair value measurements, the following fair value hierarchy distinguishes between observable and unobservable inputs, which are categorized in one of the following levels: • Level 1 inputs: Unadjusted quoted prices in active markets for identical assets or liabilities accessible to the reporting entity at the measurement date. • Level 2 inputs: Other than quoted prices included in Level 1 inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the asset or liability. • Level 3 inputs: Unobservable inputs for the asset or liability used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at measurement date. As of December 31, 2021 and 2020, the carrying amount of accounts receivable, prepaid expenses and other current assets, other assets, accounts payable, and accrued liabilities approximated their estimated fair value due to their relatively short maturities. The Company did not have warrant liabilities or earnout liabilities as of December 31, 2020. The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2021 and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value (in thousands): Fair Value Measurements on a Recurring Basis Level 1 Level 2 Level 3 Total Warrant liability – Private Placement Warrants $ — $ 15,228 $ — $ 15,228 Earnout shares liability — — 103,761 103,761 Private Placement Warrants The estimated fair value of the private placement warrants (the “Private Placement Warrants”) at July 16, 2021 is determined using Level 3 inputs by using the binominal lattice model (“BLM”), the application of BLM requires the use of several inputs and significant unobservable assumptions, including volatility. Significant judgment is required in determining the expected volatility of the Company's common stock. The following table provides quantitative information regarding Level 3 fair value measurement inputs: Assumption July 16, Stock price $ 10.33 Exercise price (strike price) $ 11.50 Risk-free interest rate 0.8% Volatility 34.2% Remaining term (in years) 5.00 Following the lapsing of certain transferability restrictions subsequent to the Business Combination, the features of the Private Placement Warrants became identical to the Public Warrants (as defined in Note 17. Stockholders' Equity), except that so long as they are held by the sponsor of the Business Combination, the Private Placement Warrants are not redeemable by the Company. Due to these similarities, the estimated fair value of the Private Placement warrants was equal to the fair value of the Public Warrants using level 2 inputs at December 31, 2021. The following table presents the changes in the liability for Private Placement Warrants during the year ended December 31, 2021 (in thousands): Balance as of July 16, 2021 $ 19,395 Change in estimated fair value (4,167) Balance as of December 31, 2021 $ 15,228 Earnout The fair value of the earnout shares was estimated by utilizing a Monte-Carlo simulation model. The inputs into the Monte-Carlo pricing model included significant unobservable inputs. The following table provides quantitative information regarding Level 3 fair value measurement inputs: Assumption December 31, July 16, Stock price $ 6.49 $ 10.33 Risk-free interest rate 1.2% 0.8% Volatility 90.0% 90.0% Remaining term (in years) 4.54 5.00 The following table presents the changes in earnout liability during the twelve months ended December 31, 2021 (in thousands): Balance as of July 16, 2021 $ 188,373 Change in estimated fair value (84,612) Balance as of December 31, 2021 $ 103,761 The Company performs routine procedures such as comparing prices obtained from independent sources to ensure that appropriate fair values are recorded.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2021
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings The Company is subject to, and may become a party to, a variety of litigation, other claims, suits, regulatory actions and government investigations and inquiries in the ordinary course of business. The Company is party to current legal proceedings as discussed more fully below. Three related putative securities class action lawsuits were filed between September 30, 2021 and November 15, 2021, in the U.S. District Court for the Western District of New York against the Company, certain of the Company’s current officers and directors and certain officers and directors of DCRB: (Kauffmann v. Hyzon Motors Inc., et al. (No. 21-cv-06612-CJS), Brennan v. Hyzon Motors Inc., et al. (No. 21-cv-06636-CJS), and Miller v. Hyzon Motors Inc. et al. (No. 21-cv-06695-CJS)), asserting violations of federal securities laws. The complaints generally allege that the Company and individual defendants made materially false and misleading statements relating to the nature of the Company’s customer contracts, vehicle orders, and sales and earnings projections, based on allegations in a report released on September 28, 2021, by Blue Orca Capital, an investment firm that indicated that it held a short position in the Company's stock and which has made numerous allegations about the Company. These lawsuits have been consolidated under the caption In re Hyzon Motors Inc. Securities Litigation (Case No. 6:21-cv-06612-CJS-MWP), and on March 21, 2022, the court-appointed lead plaintiff filed a consolidated amended complaint seeking monetary damages. Between December 16, 2021 and January 14, 2022, three related shareholder derivative lawsuits were filed in the U.S. District Court for the Western District of New York: (Lee v. Anderson et al. (No. 21-cv-06744-CJS); Révész v. Anderson et al. (No. 22-cv-06012-CJS); and Shorab v. Anderson et al. (No. 22-cv-06023CJS)). On February 2, 2022, a similar shareholder derivative lawsuit was filed in the U.S. District Court for the District of Delaware (Yellets v. Gu et al. (No. 22-cv-00156), and on February 3, 2022, another similar shareholder derivative lawsuit was filed in the Supreme Court of the State of New York, Kings County (Ruddiman v. Anderson et al. (No. 503402/2022)). These lawsuits name as defendants the Company’s current directors and certain former directors of DCRB, along with the Company as a nominal defendant, and generally allege that the individual defendants breached their fiduciary duties by making or failing to prevent the misrepresentations alleged in the consolidated securities class action, and assert claims for violations of federal securities laws, breach of fiduciary duties, unjust enrichment, abuse of control, gross mismanagement, and waste of corporate assets. These lawsuits generally seek equitable relief and monetary damages. On March 18, 2022, a putative class action complaint, Malork v. Anderson et al. (C.A. No. 2022-0260- KSJM), was filed in the Delaware Court of Chancery against certain officers and directors of DCRB, DCRB’s sponsor, and certain investors in DCRB’s sponsor, alleging that the director defendants and controlling shareholders of DCRB’s sponsor breached their fiduciary duties in connection with the merger between DCRB and Legacy Hyzon. The complaint seeks equitable relief and monetary damages. Between January 26, 2022 and March 28, 2022, Hyzon received four demands for books and records pursuant to Section 220 of the Delaware General Corporation Law from stockholders who state they are investigating whether to file similar derivative or stockholder lawsuits, among other purposes. The proceedings are subject to uncertainties inherent in the litigation process. The Company cannot predict the outcome of these matters or estimate the possible loss or range of possible loss, if any. On January 12, 2022, the Company announced that it had received a subpoena from the SEC for production of documents and information, including documents and information related to the allegations made in the September 28, 2021 report issued by Blue Orca Capital. The Company is cooperating with the SEC.

Stock-based Compensation Plans

Stock-based Compensation Plans	12 Months Ended
	Dec. 31, 2021
Stock-based Compensation Plans	Stock-based Compensation Plans 2020 Stock Incentive Plan In January 2020, Legacy Hyzon adopted the 2020 Stock Incentive Plan (the “2020 Plan”) under which employees, directors, and consultants may be granted various forms of equity incentive compensation including incentive and non-qualified options. A total number of 16,250,000 reserved shares of common stock were reserved for awards under the 2020 Plan. Shares of common stock issued under the Plan may be either authorized but unissued shares or reacquired common stock of Legacy Hyzon. Under the 2020 Plan, the exercise period of options is determined when granted, and options expire no later than fifteen years from the date of grant, subject to terms and limitations relative to termination of service and ownership percentages of the voting power of all classes of Legacy Hyzon’s stock. The 2020 Plan was terminated in connection with the Business Combination in July 2021, and Legacy Hyzon will not grant any additional awards under the 2020 Plan. Any ungranted shares under the 2020 plan expired. However, the 2020 Plan will continue to govern the terms and conditions of the outstanding awards previously granted under it. At the closing of the Business Combination, the outstanding awards under the 2020 Plan were converted at the Exchange Ratio. Share and per share information below have been converted from historical disclosure based on the Exchange Ratio. 2021 Equity Incentive Plan The 2021 Equity Incentive Plan (the “2021 Plan”) was approved by the Board of Directors on June 24, 2021, and subsequently approved by the stockholders on July 15, 2021. The 2021 Plan provides for the grant of stock options, stock appreciation rights, restricted stock, RSUs and performance awards to the Company’s employees, directors, and consultants. The number of shares of the Company’s common stock reserved for issuance under the 2021 Plan is 23,226,543 shares. In connection with the Business Combination, 21,339,493 shares of Class A common stock subject to outstanding equity awards granted under the 2020 Plan were converted into equity awards under the 2021 Plan. The number of shares of common stock available for issuance under the 2021 Plan will also include an annual increase on the first day of each year beginning in 2022 and ending in 2031, equal to the lesser of (A) two and one-half percent of the shares outstanding on the last day of the immediately preceding fiscal year and (B) such smaller number of shares as determined by the Board of Directors. Stock Options and RSUs The following table summarizes the Company’s stock option and RSU activity: Stock Options RSUs Number of Weighted Weighted Aggregate Number of Weighted Outstanding at December 31, 2020⁽¹⁾ 19,826,031 $ 1.13 — $ — Granted 281,748 $ 1.13 2,799,657 $ 6.03 Exercised or released (436,037) $ (1.22) (428,107) $ 6.28 Forfeited/Cancelled (360,602) $ (1.13) (518,865) $ 5.39 Outstanding at December 31, 2021 19,311,140 $ 1.29 13.07 100,885 1,852,685 $ 6.14 Vested and expected to vest, December 31, 2021 13,773,623 $ 1.13 12.69 74,322 1,852,685 $ 6.14 Exercisable and vested at December 31, 2021 12,126,266 $ 1.13 13.39 65,013 (1) Prior period options have been adjusted to give effect to the reverse recapitalization transaction, see Note 4. Business Combination. For all employees other than executives described below, option awards are generally granted with an exercise price equal to the fair value of the Company’s stock at the date of the grant. The awards generally have a five-year contractual term. The option period and provisions for each option granted are determined at the time of the grant, but generally vest a portion on the date of grant and then ratably each anniversary after issuance over a 5-year period of continuous service. The fair value of these stock option awards is estimated as of the grant date using a Black Scholes option pricing model and the following assumptions: a risk-free interest rate based on the U.S. Treasury yield curve at the date of grant; an expected or contractual term; and expected volatility based on an evaluation of comparable public companies’ measures of volatility. The Company does not anticipate declaring dividends on common shares now or in the near future and has therefore assumed no dividend rate. The following table discloses the assumptions, or range of assumptions, utilized for stock options for each of the grant years as follows: 2021 2020 Expected term of options (years) 5.0 0.4 to 5.0 Risk free interest rate 0.79% 0.1-0.4% Volatility 90% 90% Expected dividend $ 0.00 $ 0.00 As of December 31, 2021, there was $2.1 million of unrecognized stock-based compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 4.58 years. Restricted stock units granted under the Plans typically vest over a four or five-year period beginning on the date of grant. Restricted stock units will be settled through the issuance of an equivalent number of shares of the Company's common stock and are equity classified. The fair value of restricted shares is determined based upon the stock price on the date of grant. As of December 31, 2021, unrecognized compensation costs related to nonvested RSUs of $10.1 million is expected to be recognized over a remaining weighted average period of 3.69 years. Executives’ Awards On November 12, 2020, included in the stock options discussed above, 11,075,000 options were granted to the Company’s Executive Chairman which vest in two equal tranches and have a contractual term of 15 years. The first tranche vested on the grant date, are immediately exercisable, have an exercise price of $1.13 per share, and resulted in $4.9 million of compensation expense during 2020. The second tranche contains performance and market conditions for vesting which require an exit event of Horizon at escalating minimum equity values each year, within six years. The exercise price for the second tranche is initially $1.13 per share but increases by $0.56 per share each year during which the award remains outstanding. The fair value of the second tranche was estimated as of the grant date using a Monte Carlo simulation with key assumptions beyond those typical of option pricing models described below including the probability of achieving a Horizon exit at the required valuation in each year of the six year period. The grant date fair value of the second tranche is estimated to be $1.2 million which may or may not be recognized in the future depending on the outcome of the conditions for vesting. Additionally, on November 12, 2020, included in the stock options discussed above, 5,537,500 options were granted to the Company’s CEO which have a contractual term of 15 years, are immediately exercisable, and have an exercise price of $1.13 per share. Half of this award is subject to a two-year transferability restriction for the underlying shares of common stock, which resulted in a discount on the fair value of common stock assumption used in the determination of the fair value of this portion of the award. The grant date fair value of this award was determined using a Black Scholes option pricing model and resulted in $4.5 million of compensation expense for the period from January 21, 2020 (inception) through December 31, 2020. For the awards described above which vested immediately, the following table discloses the assumptions utilized in the Black Scholes option pricing model: Expected volatility 90% Expected dividend $ 0.00 Weighted average expected term (in years) 7.5 Risk-free rate 68% Former CTO Retirement Agreement In September 2021, included in the stock options and RSUs discussed above, the Company and former Chief Technology Officer (“former CTO”) entered into a Letter Agreement (the “Agreement”) concerning the former CTO’s retirement and separation from Hyzon. Pursuant to the Agreement, for a period of 24 months commencing on September 18, 2021 (the “Initial Consulting Period”), he serves as a consultant to Hyzon. In exchange for services provided during the Initial Consulting Period, he receives $20,000 per month. Subject to conditions of the Letter Agreement, the 1,772,000 stock options previously granted pursuant to his employment agreement with the Company continues to vest annually in equal installments on April 1, 2022 through April 1, 2025. He is also entitled to receive 250,000 RSUs of Hyzon, half of which vested after his retirement date and half of which will vest on or after the one-year anniversary of his retirement date. The service condition in the Agreement related to the vesting of these awards was determined to be non-substantive, and therefore, the Company recognized stock-based compensation expense of $13.4 million immediately in September 2021. In addition, the Company recognized salary expense of $0.5 million in September 2021 related to his monthly consulting payments.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2021
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders' Equity Common Stock The Company is authorized to issue 400,000,000 shares of common stock with a par value of $0.0001 per share. Holders of Class A common stock are entitled to one vote for each share. At December 31, 2021 and 2020, there were 247,758,412 and 166,125,000 common stock issued and outstanding, respectively. On September 16, 2020, Hyzon entered into a purchase agreement (“Purchase Agreement”) with the purchasers named therein (collectively the “Purchasers”) to sell up to 17,720,000 common shares (“Round A Transaction”). The Round A Transaction closed on various dates between October 7, 2020 and November 12, 2020. The Company raised $20.0 million and issued 17,720,000 common shares upon the close of the Round A Transaction. The Company incurred $1.0 million in costs that were both direct and incremental to the issuance of these common shares, which was recorded as a reduction of the proceeds received in additional paid-in capital. On July 27, 2020, Hyzon entered into an agreement (the “Option Agreement”) with Ascent to induce Ascent to make an initial purchase of $3.0 million of Hyzon common stock as part of a subscription in the Round A Transaction by granting Ascent an option to purchase up to 3.9 million shares of Legacy Hyzon common stock at an exercise price of $2.73 per share. Ascent options were automatically exercised upon the execution of the Business Combination (see Note 4. Business Combination). Warrants As of December 31, 2021, there were 11,286,242 Public Warrants and 8,014,500 Private Placement Warrants outstanding, for a total of 19,300,742 warrants outstanding. Each whole warrant entitles the registered holder to purchase one share of common stock at a price of $11.50 per share, subject to adjustment as discussed below. Only whole warrants are exercisable. The warrants will expire on the earlier to occur of: (i) the fifth anniversary of the completion of the Company’s Business Combination, (ii) their redemption or (iii) the liquidation of the Company. Once the warrants become exercisable, the Company may redeem the outstanding warrants for cash: • in whole and not in part; • at a price of $0.01 per warrant; • upon a minimum of 30 days’ prior written notice of redemption, which the Company refers to as the “30-day redemption period”; and • if, and only if, the last reported sale price of the Company’s common stock has been at least $18.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations, and the like) on each of 20 trading days within the 30-trading day period ending on the third business day prior to the date on which the notice of redemption is given. Once the warrants become exercisable, the Company may redeem the outstanding warrants for common stock: • in whole and not in part; • at a price of $0.10 per warrant; • upon a minimum of 30 days’ prior written notice of redemption; • if, and only if, the last reported sale price of the Company’s common stock equals or exceeds $10.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations, and the like) on the trading day prior to the date on which the notice of redemption is given; and • if the last sale price of the Company’s common stock on the trading day prior to the date on which the notice of redemption is given is less than $18.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations, and the like), the Private Placement Warrants must also be concurrently called for redemption on the same terms as the outstanding Public Warrants. The terms of the Private Placement Warrants are identical to the Public Warrants as described above, except that the Private Placement Warrants are not redeemable (except as described above) so long as they are held by the sponsor or its permitted transferees. The Public Warrants are classified as equity and subsequent remeasurement is not required. The Private Placement Warrants are classified as liabilities and are initially recorded at their fair value, within warrant liability on the Consolidated Balance Sheets, and remeasured at each subsequent reporting date. Changes in the fair value of these instruments are recognized within Change in fair value of warrant liabilities in the Consolidated Statements of Operations and Comprehensive Loss. The fair value of the Private Placement Warrants on July 16, 2021, in the amount of $19.4 million was recorded as a Warrant liability and a reduction to Additional paid-in capital on the Consolidated Balance Sheets. The change in fair value for the year ended December 31, 2021, in the amount of $4.2 million was recorded as a reduction in Warrant liability on the Consolidated Balance Sheets and a gain from Change in fair value of warrant liability on the Consolidated Statements of Operations and Comprehensive Loss. Ardour Subscription Agreement In connection with the execution of the February 8, 2021 Business Combination Agreement, DCRB, ACP Mgmt Corp., Ardour Capital Investment LLC (“Ardour”) and Hyzon entered into a subscription agreement (the “Ardour Subscription Agreement”), pursuant to which ACP Mgmt Corp. agreed, in full satisfaction of Ardour’s right to receive a warrant to purchase shares of Legacy Hyzon Common Stock for its services as a financial advisor to Hyzon, to purchase, and DCRB agreed to sell to ACP Mgmt Corp., such number of warrants exercisable for one share of Class A Common Stock at an exercise price of $2.20 (the “Ardour Warrants”), subject to the terms of the warrant agreement, dated as of July 16, 2021, by and between DCRB and Continental Stock Transfer & Trust Company (the “Ardour Warrant Agreement”), equal to (x) 184,000 multiplied by (y) the Exchange Ratio. On the close date of the Business Combination, a total of 326,048 Ardour Warrants were issued to Ardour. Such warrants are governed by and exercisable subject to the terms and conditions of the Ardour Warrant Agreement. The Ardour Warrants are equity classified and accounted for under ASC 718, as they relate to advisory services provided to the Company. As of December 31, 2021, there were 275,048 Ardour Warrants outstanding. Each whole warrant entitles the registered holder to purchase one share of common stock at a price of $2.20 per share, subject to adjustment per the Ardour Warrant Agreement. Only whole warrants are exercisable. The warrants will expire on the earlier to occur of: (i) the fifth anniversary of the completion of the Business Combination, (ii) the liquidation of the Company or (iii) their redemption. Equity Repurchase Program On November 17, 2021, the Company’s board of directors authorized the repurchase of up to $5.0 million of its outstanding common stock and/or Public Warrants. The timing and amount of any share repurchases under the Company’s share repurchase authorization will be determined by management based on market conditions and other considerations; such repurchases may be executed in the open market. As of December 31, 2021, the Company repurchased 256,977 public warrants for $0.5 million. Hongyun Warrants

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2021
Related Party Transactions [Abstract]
Related Party Transactions	Horizon IP Agreement In January 2021, the Company entered into an intellectual property agreement (the “Horizon IP Agreement”) with Jiangsu Qingneng New Energy Technologies Co., Ltd. and Shanghai Qingneng Horizon New Energy Ltd. (together, “JS Horizon”) both of which are affiliates of the Company’s ultimate parent, Horizon. Under the Horizon IP Agreement, JS Horizon assigned to the Company a joint ownership interest in certain intellectual property rights previously developed by JS Horizon (“Background IP”), and each of Hyzon and JS Horizon granted to the other, within such other party’s field of use, exclusive licenses under their respective joint ownership rights in the Background IP, as well as their rights in improvements made in the future with respect to such Background IP. Under that agreement, the Company also grants JS Horizon a perpetual non-exclusive license under certain provisional patent applications (and any patents issuing therefrom), as well as improvements thereto. On September 27, 2021, the Horizon IP Agreement was amended to add Jiangsu Horizon Powertrain Technologies Co. Ltd. (“JS Powertrain”) as a party. The Horizon IP Agreement revised and clarified the intellectual property arrangements existing as of the Company’s inception, as set forth under two previous agreements. Under a license agreement made effective at the time of the Company’s inception (the “License Agreement”), the Company received an exclusive license under certain of the Background IP. That agreement was later terminated and replaced with a Partial Assignment Agreement of Fuel Cell Technology, dated November 19, 2020 (the “Partial Assignment Agreement”), which contemplated a joint ownership structure with respect to certain of the Background IP similar to the structure set forth under the now existing Horizon IP Agreement. Both the original License Agreement and Partial Assignment Agreement have been superseded by the Horizon IP Agreement. Under the terms of the Horizon IP Agreement, the Company was to pay JS Horizon and JS Powertrain $10.0 million as consideration for the rights it receives under the Background IP and improvements thereto. As of December 31, 2021, $6.9 million was paid and the remaining $3.1 million was paid in February 2022. Because the Company is under common control with Horizon and JS Horizon, the cost of the intellectual property transferred should equal the historical cost of the Background IP to the Company’s ultimate parent, Horizon. Due to the creation of the Background IP through research and development over a long historical period of time, the historical cost of the intellectual property acquired was zero. As such, no asset was recorded for the Background IP on the Company’s Consolidated Balance Sheets. The difference between the fixed amounts payable to JS Horizon and JS Powertrain and the historical cost was treated as a deemed distribution to Horizon, given the common control of the entities. Horizon Fuel Cell Technologies and Related Subsidiaries Hyzon utilizes Horizon and its affiliates to supply certain fuel cell components. In March 2021, the Company made a deposit payment to Horizon in the amount of $5.0 million to secure fuel cell components. This payment is included in prepaid expenses as none of the components have yet been received. As of December 31, 2021, the Company’s Consolidated Balance Sheet includes $7.5 million of inventory, $0.7 million of fixed asset and an additional $0.3 million of prepayment from Horizon. For the year ended December 31, 2021, $0.2 million of fuel cell components purchased from Horizon and its affiliates were recorded in the Cost of goods sold in the Company’s Consolidated Statements of Operations and Comprehensive Loss. Certain employees of Horizon and its affiliates provide research and development, sales, and administrative services to the Company. Approximately $2.9 million and $0.5 million was recorded in the Company’s Consolidated Statements of Operations and Comprehensive Loss related to such services for the year ended December 31, 2021, and for the period from January 21, 2020 (inception) through December 31, 2020, respectively. The related party liability to Horizon and affiliates is $3.7 million and $0.4 million as of December 31, 2021 and 2020, respectively. Holthausen and Affiliates The Company entered into a joint venture agreement in 2020 to create Hyzon Europe with Holthausen. As Hyzon Europe builds out its production facilities, it relies on Holthausen for back office administrative services and certain production resources that result in related party transactions. In addition, both companies rely on certain suppliers, including Horizon. In June 2021, the Company transferred inventory purchased from Horizon amounting to $1.2 million to Holthausen at cost and recorded a related party receivable of $1.2 million. In July 2021, Hyzon Europe assumed certain retrofit service contracts from Holthausen Clean Technology B.V. The Company incurred $0.1 million to acquire these contracts. For the year ended December 31, 2021, the Company paid $0.5 million to Carl Holthausen and Max Holthausen as managing directors of Hyzon Europe. The Company currently owns 50.5% of the equity interests of Hyzon Europe. In December 2021, Hyzon executed a non-binding Letter of Intent (“LOI”) with Holthausen to increase its stake to 75% in Hyzon Europe. Concurrent with the signing of this LOI, a €1.0 million refundable deposit was paid to Holthausen, approximately $1.1 million in USD. This deposit is recorded in the Consolidated Balance Sheets in Prepaid expenses and other current assets. As of December 31, 2021, the related party receivable from Holthausen is $0.3 million. As of December 31, 2020, the related party payable due to Holthausen was $0.2 million. Jiushuang (Shanghai) New Energy Technology Co., Ltd. In December 2021, Hyzon China entered into a new energy vehicle sales contract with Jiushuang (Shanghai) New Energy Technology Co., Ltd to deliver 20 FCEVs. Those FCEVs were delivered in the third quarter of 2022. Hyzon China received a payment of $0.1 million from Jiushuang (Shanghai) New Energy Technology Co., Ltd in 2021 to partially satisfy VAT obligations to the government. Jiushuang (Shanghai) New Energy Technology Co., Ltd. is the parent of both JSTC and JSSD, which the Company partnered with to form Jiushuang JVs, discussed in Note 12. Investments in Non-consolidated Affiliates.

Loss per Share

Loss per Share	12 Months Ended
	Dec. 31, 2021
Loss per Share	Loss per Share The following table presents the information used in the calculation of the Company's basic and diluted earnings (loss) per share attributable to Hyzon common stockholders (in thousands, except per share data): Year Ended For the period Net loss attributable to Hyzon $ (12,141) $ (14,271) Weighted average shares outstanding: Basic 203,897 152,650 Effect of dilutive securities — — Diluted 203,897 152,650 Net loss per share attributable to Hyzon: Basic $ (0.06) $ (0.09) Diluted $ (0.06) $ (0.09) The weighted average number of shares outstanding prior to Business Combination were converted at the Exchange Ratio. Potentially dilutive shares are excluded from the computation of diluted net loss when their effect was antidilutive. The following outstanding common stock equivalents (in thousands) were excluded from the computation of diluted net loss per share for the periods presented because including them would have been anti-dilutive. Year Ended For the Period Restricted stock units 1,853 — Stock options with service conditions 12,001 14,288 Stock options for former CTO 1,772 — Stock options with market and performance conditions 5,538 5,538 Private placement warrants 8,015 — Public warrants 11,286 — Earnout shares 23,250 — Hongyun warrants 31 — Ardour warrants 275 —

Leases

Leases	12 Months Ended
	Dec. 31, 2021
Leases	Leases The Company has entered into various non-cancellable operating and finance lease agreements for certain offices, warehouses, R&D and manufacturing locations, equipment and vehicles worldwide. The Company determines if an arrangement is a lease, or contains a lease, at inception and records the leases in the consolidated financial statements upon lease commencement, which is the date when the underlying asset is made available for use by the lessor. The following table presents supplemental balance sheet information related to leases (in thousands): December 31, December 31, Operating leases: Operating lease right-of-use assets $ 9,933 $ 943 Operating lease liabilities $ (10,062) $ (942) Finance leases: Finance lease right-of-use assets $ 332 $ 713 Finance lease liabilities $ (654) $ (857) Weighted average remaining lease term: Operating leases 7.3 years 4.9 years Finance leases 1.4 years 2.4 years Weighted average discount rate: Operating leases 5.7 % 7.1 % Finance leases 7.0 % 6.9 % The components of the lease expenses are as follows (in thousands): Year Ended For the period Operating lease cost $ 862 $ 19 Variable lease cost 205 30 Finance lease cost: Amortization of right-of-use assets 381 172 Interest on lease liabilities 53 35 Total lease cost $ 1,501 $ 256 Supplemental cash flows information related to leases is as follows (in thousands): Year Ended For the period Cash paid for amount included in the measurement of lease liabilities: Operating cash flows from operating leases $ 739 $ 19 Operating cash flows from finance leases $ 53 $ 35 Financing cash flows from finance leases $ 203 $ 29 Right-of-use assets obtained in exchange for new lease liabilities: Operating leases $ 9,588 $ 780 Finance leases $ — $ 886 The maturities of operating and finance lease liabilities (excluding short-term leases) are as follows (in thousands): As of December 31, Operating Finance 2022 $ 1,978 $ 448 2023 1,894 240 2024 1,806 — 2025 1,745 — 2026 and thereafter 4,737 — Total minimum lease payments 12,160 688 Less: imputed interest 2,098 34 Present value of lease obligations 10,062 654 Less: current portion 1,453 433 Long-term portion of lease obligations $ 8,609 $ 221

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events (Unaudited) Global NRG H2 Limited During the quarter ended June 30, 2022, the Company determined that there was a full impairment of the Company’s $2.5 million investment in NRG. For additional information regarding the NRG investment refer to Note 11. Investments in Equity Securities to the consolidated financial statements. Holthausen and Affiliates In December 2022, the Company acquired the remaining 49.5% stake, or 1,485,000 A Shares par value €0.01 in Hyzon Europe from Holthausen. The Company now holds 100% ownership in Hyzon Europe. The consideration paid by the Company to Holthausen was €5.52 million (approximately $5.84 million in USD), consisting of €4.50 million (approximately $4.76 million in USD) in cash, including prepaid balances, and €1.02 million (approximately $1.08 million in USD) (excluding any VAT) of certain inventory. In addition, Hyzon Europe transferred all of the assumed retrofit service contracts including after-sales obligations back to Holthausen Clean Technology B.V. upon closing of the transaction. Delaware Court of Chancery Section 205 On February 13, 2023, the Company filed a petition under the caption In re Hyzon Motors Inc. , C.A. No. 2023-0177-LWW (Del. Ch) in the Delaware Court of Chancery pursuant to Section 205 of the Delaware General Corporation Law (“DGCL”), which permits the Court of Chancery, in its discretion, to validate potentially defective corporate acts due to developments regarding potential interpretations of the DGCL stemming from the Court’s recent decision in Garfield v. Boxed, Inc., 2022 WL 17959766 (Del. Ch. Dec. 27, 2022). On March 6, 2023, the Court of Chancery granted our petition, holding that any defects that may have existed with respect to the conduct of the Special Meeting of Shareholders held on July 15, 2021 to approve the increase in the Company’s authorized share capital were ratified as of the meeting. The Company continues to believe that, notwithstanding the relief the Delaware Court of Chancery granted to the Company under Section 205, at the time of DCRB Shareholder Meeting on July 16, 2021, the increase in the Company’s authorized share capital was validly approved by DCRB’s shareholders under Delaware law.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2021
Basis of Presentation	Basis of PresentationThe accompanying consolidated financial statements and related disclosures have been prepared in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") pursuant to the requirements and rules of the Securities and Exchange Commission (“SEC”). Any reference in these notes to applicable guidance refers to U.S. GAAP as found in U.S. Accounting Standards Codification ("ASC") and Accounting Standards Update ("ASU") of the Financial Accounting Standards Board ("FASB").
Principles of Consolidation	Principles of Consolidation The consolidated financial statements reflect the Company’s accounts and operations, those of its wholly owned subsidiaries and subsidiaries in which the Company has a controlling financial interest. In accordance with the provisions of ASC 810, Consolidation
Use of Estimates	Use of EstimatesThe consolidated financial statements of the Company have been prepared in conformity with U.S. GAAP, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Segment Information	Segment InformationThe Company’s Chief Executive Officer has been identified as the chief operating decision maker. As the chief operating decision maker reviews financial information presented on a consolidated basis for purposes of making operating decisions, allocating resources, and evaluating financial performance, the Company has determined that it operates in one operating and reportable segment.
Liquidity and Capital Resources	Liquidity and Capital Resources The Company has incurred losses from operations since inception. The Company incurred net losses of $16.9 million and $14.4 million for the year ended December 31, 2021 and the period from January 21, 2020 (inception) through December 31, 2020, respectively. Accumulated deficit amounts to $26.4 million and $14.3 million as of December 31, 2021 and 2020, respectively. Net cash used in operating activities was $94.3 million and $1.2 million for the year ended December 31, 2021 and the period from January 21, 2020 (inception) through December 31, 2020, respectively.
Revenue	Revenue The Company accounts for revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers ("ASC 606"). Revenue is based on the amount of transaction price to which the Company is entitled, subject to the allocation of the transaction price to distinct performance obligations. The Company recognizes revenue when its customer obtains control of promised goods or services in an amount that reflects the consideration for which the Company expects to receive in exchange for those goods or services. To determine revenue recognition, the Company performs the following five steps: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract and (5) recognize revenue when (or as) the entity satisfies a performance obligation. When it determines it is not probable that it will collect all of the consideration to which it will be entitled under a customer contract, the Company concludes the contract existence criteria under ASC 606 are not met. In these cases, the Company recognizes revenue to the extent of consideration received provided the amounts are non-refundable, the Company has transferred control of the goods or services to which the consideration relates, the Company has stopped transferring goods or services, and there is no obligation to transfer additional services ("Alternative Method for Revenue Recognition"). The Company recognizes the incremental costs of obtaining contracts, including commissions, as an expense when incurred as the contractual period of the Company's arrangements are expected to be one year or less. Amounts billed to customers related to shipping and handling are classified as revenue, and the Company has elected to recognize the cost for freight and shipping when control over vehicles, parts, or accessories has transferred to the customer as an expense in cost of revenue. Product Sales The Company enters into sales contracts with customers for the purchase of the Company’s products and services including fuel cell systems, FCEVs, parts, product support, and other related services. The Company considers order confirmations or purchase orders, which in some cases are governed by master vehicle supply agreements, to be contracts with a customer. The Company recognizes revenue when it satisfies a performance obligation by transferring control of product(s) or service to a customer. On standard vehicle sales contracts, revenues are recognized at a point in time when customers obtain control of the vehicle, which among other indicators, is generally when transfer of title and risks and rewards of ownership of goods have passed and when the Company has a present right to payment. Provisions for warranties are made at the time of sale. Sales, value-added, and other taxes collected concurrent with revenue producing activities are excluded from revenue. Payment terms for sales of FCEVs to certain customers have included installment billing terms to fund the Company’s working capital requirements. The Company does not adjust the transaction price for a significant financing component when the performance obligation is expected to be fulfilled within a year as the amount is not material. In China, the Company has granted extended payment terms to customers, which resulted in the Company concluding collection of all of the consideration under the contract is not probable. As a result, the contract existence criteria is not met and revenue is recognized under the Alternative Method of Revenue Recognition, which may not be in the same period that control of the related goods is transferred to the customers (see Note 5. Revenue). The Company does not include a right of return on its products other than rights related to standard warranty provisions that permit repair or replacement of defective goods.
Accounts Receivable	Accounts ReceivableAccounts receivable primarily arise from sales of FCEVs to customers in the normal course of business. They are stated at the amount billed or billable to customers, net of any allowance for credit losses. An allowance for credit losses accounts is established through a charge to Selling, general, and administrative (“SG&A”) expenses. The allowance is an estimate of the amount required to absorb probable losses on receivables that may become uncollectible. The receivables are written-off when amounts due are determined to be uncollectible. Since the date of inception, the Company has not experienced significant losses or past due amounts on trade and other receivables. As of December 31, 2021 and 2020 the Company recorded no allowance for credit losses.
Concentration of Supply Risk	Concentration of Supply RiskThe Company is subject to risks related to its dependence on suppliers as some of the components and technologies used in the Company’s products are produced by a limited number of sources or contract manufacturers. The inability of these suppliers to deliver necessary components in a timely manner, at prices and quantities acceptable to the Company may cause the Company to incur transition costs to other suppliers and could have a material and adverse impact on the Company’s business, growth and financial and operating results. The Company currently relies and expects to rely on Horizon as a single source supplier of hydrogen fuel cell systems until completion of Hyzon hydrogen fuel cell manufacturing facilities.
Warranties	WarrantiesIn most cases, products that customers purchase from the Company are covered by a one
Leases	Leases The Company accounts for leases in accordance with ASC Topic 842, Leases (“ASC 842”). The Company determines if an arrangement is or contains a lease at contract inception. The Company recognizes a right of use ("ROU") asset and a lease liability (i.e., finance obligation) at the lease commencement date. For operating and finance leases, the lease liability is initially measured at the present value of the unpaid lease payments at the lease commencement date and is subsequently measured at amortized cost using the effective interest method. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The Company has operating or finance leases for office space, research and development space, warehouse and manufacturing space. For finance leases, lease liabilities are increased by interest and reduced by payments each period, and the right of use asset is amortized over the lease term. For operating leases, interest on the lease liability and the amortization of the right of use asset results in straight-line rent expense over the lease term. The lease term for all of the Company’s leases includes the noncancelable period of the lease, plus any additional periods covered by either a Company option to extend (or not to terminate) the lease that the Company is reasonably certain to exercise, or an option to extend (or not to terminate) the lease controlled by the lessor. Lease payments included in the measurement of the lease liability comprise fixed payments, and the exercise price of a Company option to purchase the underlying asset if the Company is reasonably certain to exercise the option. Variable lease payment amounts that cannot be determined at the commencement of the lease, such as increases in lease payments based on changes in index rates or usage, are not included in the ROU assets or liabilities. These are expensed as incurred and recorded as variable lease expense.
Cash & Restricted Cash	Cash & Restricted Cash Cash includes cash held in banks. The Company deposits its cash with high credit quality institutions to minimize credit risk exposure.
Inventory	InventoryInventories are stated at the lower of cost and net realizable value ("NRV"). Cost is determined using the first-in, first-out method ("FIFO") for all inventories. The Company writes-down inventory for any excess or obsolete inventoried or when the Company believes that the net realizable value of inventories is less than the carrying value. Inventory write-downs are recognized in Cost of revenue.
Property and Equipment	Property, Plant, and Equipment Property, plant, and equipment is stated at cost less accumulated depreciation and amortization. Major improvements that extend the useful life or add functionality are capitalized. Repair and maintenance costs are expensed as incurred. The cost of properties sold or otherwise disposed of and the related accumulated depreciation and amortization are eliminated from the balance sheet accounts at the time of disposal and resulting gains and losses are included as a component of operating income. Depreciation is recorded on a straight-line basis over the shorter of the lease term or the following estimated useful lives of the assets. Years Buildings and improvements 30 years Leasehold improvements 5 years Machinery and equipment 7 years Software 3 - 5 years Vehicles 5 years
Investments in Equity Securities	Investments in Equity Securities The Company owns common shares, participation rights, and options to purchase additional common shares in certain private companies. The Company does not have control and does not have the ability to exercise significant influence over operating and financial policies of these entities. The investment does not have a readily determinable fair value and thus the investment is measured at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment. Changes in the fair values of the investments are recorded in Other income (expense) on the Consolidated Statements of Operations and Comprehensive Loss (see Note 11. Investments in Equity Securities).
Investments in Non-consolidated Affiliates	Investments in Non-consolidated Affiliates Equity method investments are recorded at original cost and adjusted periodically to recognize (i) the Company’s proportionate share of the investees’ net income or losses after the date of investment, (ii) additional contributions made and dividends or distributions received, and (iii) impairment losses resulting from adjustments to fair value.
Fair Value Measurements	Fair Value MeasurementsFinancial assets and liabilities are categorized, based on the inputs to the valuation technique, into a three-level fair value hierarchy. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets and liabilities and lowest priority to unobservable inputs. Observable market data, when available, is required to be used in making fair value measurements. When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement.
Warrant Liabilities	Warrant liabilities The Company accounts for warrants as either equity-classified or liability-classified instruments based on an assessment of the warrant’s specific terms and applicable authoritative guidance in FASB ASC 480, Distinguishing Liabilities from Equity (“ASC 480”) and ASC 815-40, Derivatives and Hedging—Contracts in Entity’s Own Equity (“ASC 815”). The assessment considers whether the warrants are freestanding financial instruments pursuant to ASC 480, meet the definition of a liability pursuant to ASC 480, and whether the warrants meet all of the requirements for equity classification under ASC 815, including whether the warrants are indexed to the Company’s own common stock, among other conditions for equity classification.
Earnout liability	Earnout liability As a result of the Business Combination, the Company recognized earnout shares to Legacy Hyzon’s common stockholders as a liability. Pursuant to ASC 805-10, Business Combinations (“ASC 805”) the Company determined that the initial fair value of the earnout shares should be recorded as a liability with the offset recorded to additional paid-in capital and with subsequent changes in fair value recorded in the Consolidated Statements of Operations and Comprehensive Loss at each reporting period. The earnout shares to other holders of outstanding equity awards are accounted for under ASC 718, Stock Compensation (“ASC 718”), as these earnout shares are compensatory in nature and relate to services provided or to be provided to the Company.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company assesses the recoverability of its long-lived assets whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The assessment of possible impairment is based on the ability to recover the carrying value of the assets from expected undiscounted future cash flows from operations. An impairment charge would be recognized equal to the amount by which the carrying amount exceeds the estimated fair value of the asset. Fair value is determined using either the market or sales comparison approach, cost approach or anticipated cash flows discounted at a rate commensurate with the risk involved. The Company did not record any impairment loss for the year ended December 31, 2021, nor for the period from January 21, 2020 (inception) through December 31, 2020.
Income Taxes	Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the period that includes the enactment date. A valuation allowance is recorded to reduce the carrying amounts of deferred tax assets if it is more likely than not that such assets will not be realized. The Company accounts for uncertain tax positions in accordance with ASC Topic 740, Income Taxes (“ASC 740”), which clarifies the accounting for uncertainty in tax positions. This interpretation requires that an entity recognizes in its consolidated financial statements the impact of a tax position, if that position is more likely than not of being sustained upon examination, based on the technical merits of the position. Recognized income tax positions are measured at the largest amount that is greater than 50% likely of being realized. Changes in recognition or measurement are reflected in the period in which the change in judgment occurs. The Company has elected to classify interest and penalties related to unrecognized tax benefits, if and when required, as part of income tax expense in the Consolidated Statements of Operations and Comprehensive Loss.
Foreign Currency Translation and Transactions	Foreign Currency Translation and Transactions The functional and reporting currency of each of the Company’s foreign subsidiaries is determined based on the primary currency in which they operate and appropriate economic factors. For the translation from the applicable foreign currencies to U.S. dollars, period-end exchange rates are utilized for balance sheet accounts and weighted average exchange rates for each period for revenue and expense accounts. The cumulative translation adjustments are recognized as a component of Accumulated other comprehensive loss. For all transactions denominated in a currency other than a subsidiary’s functional currency, exchange rate gains and losses are recognized in earnings in the period incurred. Net foreign currency transaction losses of $1.3 million and a negligible amount were recorded for the year ended December 31, 2021 and for the period from January 21, 2020 (inception) through December 31, 2020, respectively. These amounts are recorded in Other income (expense) on the Consolidated Statements of Operations and Comprehensive Loss.
Stock-based Compensation	Stock-based Compensation Incentive plans that provide for the granting of stock-based compensation to employees, directors, and consultants are described in Note 16. Stock-based Compensation Plans. The Company recognizes compensation expense for its stock-based compensation programs, which can include stock options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”) and performance awards. The fair value of stock option awards with only service and/or performance conditions is estimated on the grant or offering date using the Black-Scholes option-pricing model. Assumptions used to estimate compensation expense include fair value of common stock, expected price volatility of common stock, expected term, risk-free interest rates, and expected dividend yield. The fair value of RSUs is measured on the grant date based on the closing fair market value of the Company's common stock. Stock-based compensation expense is recognized on a straight-line basis over the requisite service period, net of actual forfeitures in the period.
Research and Development	Research and DevelopmentResearch and development costs arise from ongoing activities associated with improving existing products and advancing development of new and next generation products. Research and development costs that do not meet the requirements to be recognized as an asset, as the associated future benefits are uncertain and no alternative future use is identified, are expensed as incurred.
Selling, General and Administrative Expense	Selling, General, and Administrative ExpenseSelling, general, and administrative expense consist of personnel costs, depreciation and amortization, sales and marketing costs, and facilities expense. These costs are recognized when incurred.
Comprehensive Loss	Comprehensive Income (Loss)Comprehensive income (loss) consists of two components, net income (loss) and comprehensive income (loss). Foreign currency translation adjustments are reported in Comprehensive income (loss) in the Consolidated Statements of Operations and Comprehensive Income (Loss).
Variable Interest Entities (VIE)	Variable Interest Entity Arrangements The Company performs both qualitative and quantitative analysis of its variable interests, including loans, guarantees, and equity investments, to determine if the Company has any variable interests in variable interest entities. Qualitative analysis is based on an evaluation of the design of the entity, its organizational structure including decision making ability, and financial agreements. Quantitative analysis is based on the entity’s forecasted cash flows. U.S. GAAP requires a reporting entity to consolidate a variable interest entity when the reporting entity has a variable interest that provides it with a controlling financial interest in the variable interest entity. The entity that consolidates a variable interest entity is referred to as the primary beneficiary of that variable interest entity. The Company uses qualitative and quantitative analyses to determine if it is the primary beneficiary of variable interest entities. In 2020, Hyzon entered into a joint venture agreement (the “JV Agreement”) with Holthausen Clean Technology Investment B.V. (“Holthausen”) (together referred to as the “Shareholders”) to establish a venture in the Netherlands called Hyzon Motors Europe B.V. (“Hyzon Europe”). The Shareholders combined their resources in accordance with the JV Agreement to mass commercialize fuel cell trucks within the European Union and nearby markets such as the United Kingdom, the Nordic countries, and Switzerland through Hyzon Europe. Hyzon and Holthausen have 50.5% and 49.5% ownership interest in the equity of Hyzon Europe, respectively. The Company determined it is the primary beneficiary of Hyzon Europe because it serves as the manager of the Hyzon Europe’s operations, for which it owns 50.5%, thereby giving the Company the power to direct activities of the Hyzon Europe that most significantly impact its economic performance. The Company also has exposure to the losses of the entity and the right to receive benefits from the entity that could potentially be significant to the entity as a result of its equity interest. The Consolidated Balance Sheets after elimination of any intercompany transactions and balances include assets of $49.5 million and $1.0 million as of December 31, 2021 and 2020, respectively, and liabilities of $13.1 million and $1.2 million as of December 31, 2021 and 2020, respectively, related to Hyzon Europe. The noncontrolling interest represents Holthausen’s ownership interest in Hyzon Europe. On October 18, 2021, the Company’s wholly owned subsidiary, Hyzon Automotive Technology Co., Ltd. (“Hyzon China”) entered into a joint venture agreement (the “Foshan JV Agreement”) with Foshan Zhongbang Earthwork Engineering Co., Ltd. (“FSZB”) and a private citizen of People’s Republic of China (together referred to as the “Foshan JV Shareholders”) forming Foshan Hyzon New Energy Technology Co., Ltd. (“Hyzon Foshan”). Foshan JV Shareholders engages in the commercial sales, operation, leasing and promotion of fuel cell muck-truck, mixer-truck and other construction vehicles within Foshan City, Guangdong Province. Hyzon, FSZB, and the private citizen shareholder have a 51.0%, 44.0%, and 5.0% interest in the equity of the Company, respectively.
Net Loss Per Share	Net Income (Loss) Per Share Basic net income (loss) per share attributable to common stockholders is computed by dividing net income (loss) (the numerator) by the weighted average number of common shares outstanding for the period (the denominator). Diluted net income (loss) per share attributable to common stockholders is computed by dividing net income (loss) by the weighted average number of common shares and all potential common shares outstanding, unless the impact would be anti-dilutive, during each period presented.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently issued accounting pronouncements not yet adopted In October 2021, the FASB issued ASU No. 2021-08, Business Combination (Topic 805) : Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This ASU requires an acquirer in a business combination to recognize and measure contract assets and contract liabilities (deferred revenue) from acquired contracts using the revenue recognition guidance in ASC 606. At the acquisition date, the acquirer applies the revenue model as if it had originated the acquired contracts. The ASU is effective for annual periods beginning after December 15, 2022, including interim periods within those fiscal years. Adoption of the ASU should be applied prospectively to business combinations occurring on or after the effective date of the amendments. Early adoption is permitted, including adoption in an interim period. The Company is in the process of assessing the impact of this guidance on its consolidated financial statements. Recently adopted accounting pronouncements In November 2021, the FASB issued ASU No. 2021-10, Government Assistance (Topic 832) : Disclosures by Business Entities about Government Assistance. This ASU requires business entities to disclose information about government assistance they receive if the transactions were accounted for by analogy to either a grant or a contribution accounting model. The disclosure requirements include the nature of the transaction and the related accounting policy used, the line items on the balance sheets and statements of operations that are affected and the amounts applicable to each financial statement line item and the significant terms and conditions of the transactions, including commitments and contingencies. The ASU is effective for annual periods beginning after December 15, 2021. Early application of the amendments is permitted. The disclosure requirements can be applied either retrospectively or prospectively to all transactions in the scope of the amendments that are reflected in the financial statements at the date of initial application and new transactions that are entered into after the date of initial application. The ASU does not have and is currently not expected to have a material impact on the consolidated financial statements.

Restatement of Previously Iss_2

Restatement of Previously Issued Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2021
Accounting Changes and Error Corrections [Abstract]
Schedule of Restatement of Previously Issued Financial Statements	The following tables present the effect of the Restatement Items, as well as Other Immaterial Errors, on the Company’s consolidated balance sheet for the period indicated (in thousands, except per share): As of December 31, 2021 As Previously Reported Restatement Adjustments Restatement References As Restated ASSETS Current assets Cash $ 445,146 $ — $ 445,146 Accounts receivable 2,598 358 2,956 Related party receivable 264 — 264 Inventory 19,245 1,682 (A), (B) 20,927 Prepaid expenses and other current assets 27,970 (1,118) (A) 26,852 Total current assets 495,223 922 496,145 Property, plant, and equipment, net 14,311 35 14,346 Right-of-use assets 10,265 — 10,265 Investments in equity securities 4,948 — 4,948 Other assets 5,430 (855) (A) 4,575 Total Assets $ 530,177 $ 102 $ 530,279 LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities Accounts payable $ 8,430 $ (450) 7,980 Accrued liabilities 6,026 744 (A), (B) 6,770 Related party payables 3,633 62 3,695 Contract liabilities 11,230 (305) (A), (B) 10,925 Current portion of lease liabilities 1,886 — 1,886 Total current liabilities 31,205 51 31,256 Long term liabilities Lease liabilities 8,830 — 8,830 Private placement warrant liability 15,228 — 15,228 Earnout liability 103,761 — 103,761 Other liabilities 1,296 (157) (A) 1,139 Total liabilities 160,320 (106) 160,214 Commitments and contingencies Stockholders' Equity Common stock, $0.0001 par value; 400,000,000 shares authorized, 247,758,412 and 166,125,000 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively 25 — 25 Additional paid-in capital 403,016 (2,190) (C) 400,826 Accumulated deficit (28,117) 1,705 (26,412) Accumulated other comprehensive income (loss) 373 5 378 Total Hyzon Motors Inc. stockholders’ equity 375,297 (480) 374,817 Noncontrolling interest (5,440) 688 (4,752) Total Stockholders’ Equity 369,857 208 370,065 Total Liabilities and Stockholders’ Equity $ 530,177 $ 102 $ 530,279 The following tables present the effect of the Restatement Items, as well as Other Immaterial Errors, on the Company’s consolidated statement of operations and comprehensive loss for the period indicated (in thousands, except per share amounts): Year Ended December 31, 2021 As Previously Reported Restatement Adjustments Restatement References As Restated Revenue $ 6,049 $ (6,129) (A), (B) $ (80) Operating expense: Cost of revenue 21,191 (5,557) (A), (B) 15,634 Research and development 16,443 (982) (B) 15,461 Selling, general, and administrative 69,792 (1,939) (A), (B), (C) 67,853 Total operating expenses 107,426 (8,478) 98,948 Loss from operations (101,377) 2,349 (99,028) Other income (expense): Change in fair value of private placement warrant liability 4,167 — 4,167 Change in fair value of earnout liability 84,612 — 84,612 Foreign currency exchange loss and other expense (1,452) 43 (1,409) Interest expense, net (5,235) — (5,235) Total other income (expense) 82,092 43 82,135 Net loss $ (19,285) $ 2,392 $ (16,893) Less: Net loss attributable to noncontrolling interest (5,439) 687 (4,752) Net loss attributable to Hyzon $ (13,846) $ 1,705 $ (12,141) Comprehensive loss: Net loss (19,285) 2,392 (16,893) Foreign currency translation adjustment 479 6 485 Comprehensive loss (18,806) 2,398 (16,408) Less: Comprehensive loss attributable to noncontrolling interest (5,349) 688 (4,661) Comprehensive loss attributable to Hyzon $ (13,457) $ 1,710 $ (11,747) Net loss attributable to Hyzon per share: Basic $ (0.07) $ 0.01 $ (0.06) Diluted $ (0.07) $ 0.01 $ (0.06) Weighted average common shares outstanding: Basic 203,897 — 203,897 Diluted 203,897 — 203,897 The following tables present the effect of the Restatement Items, as well as Other Immaterial Errors, on the Company’s consolidated statement of changes in stockholders' equity (in thousands, except share and per share amounts): Common Stock Class A Retained Earnings (Accumulated Deficit) Accumulative Other Comprehensive Income Total Hyzon Motors Inc. Stockholders' Equity (Deficit) Noncontrolling Interest Total Stockholders' Equity Shares Amount Additional Paid-in Capital BALANCE - December 31, 2021 (As Previously Reported) 247,758,412 $ 25 $ 403,016 $ (28,117) $ 373 $ 375,297 $ (5,440) $ 369,857 Cumulative adjustments — — (2,190) 1,705 5 (480) 688 208 BALANCE - December 31, 2021 (As Restated) 247,758,412 $ 25 $ 400,826 $ (26,412) $ 378 $ 374,817 $ (4,752) $ 370,065 The following tables present the effect of the Restatement Items, as well as Other Immaterial Errors, on the Company’s consolidated statement of cash flows (in thousands): Year Ended December 31, 2021 As Previously Reported Restatement Adjustments*** As Restated Cash Flows from Operating Activities: Net loss $ (19,285) $ 2,392 $ (16,893) Adjustments to reconcile net loss to net cash used in operating activities: Depreciation and amortization 1,140 — 1,140 Stock-based compensation 29,148 939 30,087 Loss on extinguishment of convertible notes 107 — 107 Noncash interest expense 5,224 — 5,224 Issuance of warrants 188 — 188 Fair value adjustment of private placement warrant liability (4,167) — (4,167) Fair value adjustment of earnout liability (84,612) — (84,612) Changes in operating assets and liabilities: Accounts receivable (2,614) (357) (2,971) Inventory (19,276) (1,682) (20,958) Prepaid expenses and other current assets (22,970) (1,967) (24,937) Other assets (1,023) 854 (169) Accounts payable 8,164 362 8,526 Accrued liabilities 4,966 (75) 4,891 Related party payables (290) 63 (227) Contract liabilities 8,684 634 9,318 Other liabilities 1,425 (279) 1,146 Net cash used in operating activities (95,191) 884 (94,307) Cash Flows from Investing Activities: Purchases of property and equipment (14,525) (35) (14,560) Advanced payments for capital expenditures (4,257) 3,085 (1,172) Investment in equity securities (4,826) — (4,826) Investment in non-consolidated affiliates (98) — (98) Net cash used in investing activities (23,706) 3,050 (20,656) Cash Flows from Financing Activities: Proceeds from issuance of common stock, net of transaction costs — — — Proceeds from Business Combination, net of redemption and transaction costs 512,936 (3,943) 508,993 Payment for purchase of Horizon IP (6,900) — (6,900) Exercise of stock options 532 — 532 Payment of finance lease liability (203) — (203) Debt issuance costs (133) — (133) Repurchase of warrants (540) — (540) Deferred transaction costs — — — Proceeds from issuance of convertible notes 45,000 — 45,000 Net cash provided by financing activities 550,692 (3,943) 546,749 Effect of exchange rate changes on cash 431 9 440 Net change in cash and restricted cash 432,226 — 432,226 Cash—Beginning 17,139 — 17,139 Cash and restricted cash—Ending $ 449,365 $ — $ 449,365 Supplemental schedule of non-cash investing activities and financing activities: Conversion of Legacy Hyzon Common Stock 73 — 73 Recognition of earnout liability in Business Combination 188,373 — 188,373 Recognition of Private Placement Warrant liability in Business Combination 19,395 — 19,395 Horizon IP Agreement - Fee 10,000 — 10,000 Conversion of convertible notes for common stock 50,198 — 50,198 Acquisitions of property and equipment included in current liabilities 61 — 61 *** The adjustments within the consolidated statement of cash flows for the year ended December 31, 2021 were due to the reconciliation of the changes in account balances used in preparing the statement of cash flows resulting from the various error corrections included in the above financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2021
Accounting Policies [Abstract]
Summary Depreciation is recorded on a straight-line basis over the shorter of the lease term	Depreciation is recorded on a straight-line basis over the shorter of the lease term or the following estimated useful lives of the assets. Years Buildings and improvements 30 years Leasehold improvements 5 years Machinery and equipment 7 years Software 3 - 5 years Vehicles 5 years

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2021
Business Combinations [Abstract]
Summary of the Elements of the Business Combination to the Condensed Statements	The number of shares of common stock issued immediately following the consummation of the Business Combination: Shares Common Stock of DCRB 20,483,179 DCRB Founders 5,643,125 Total DCRB 26,126,304 Conversion of Ascent options (post-cashless exercise) 6,871,667 Conversion of convertible notes 5,022,052 PIPE shares 35,500,000 Reverse recapitalization transaction 73,520,023 Legacy Hyzon Shares after conversion (1) 173,474,186 Total shares of Common Stock immediately after Business Combination 246,994,209 (1) The number of Legacy Hyzon shares was determined from the 97,897,396 shares of Legacy Hyzon common stock outstanding immediately prior to the closing of the Business Combination converted at the Exchange Ratio of 1.772. All fractional shares were rounded down. The following table reconciles the elements of the Business Combination to the Consolidated Statements of Cash Flows for the year ended December 31, 2021 (in thousands): Recapitalization Cash – DCRB trust and cash, net of redemptions and liabilities recorded by DCRB of $24.9 million $ 179,727 Cash – PIPE Financing, net of transaction costs of $14.2 million 340,797 Less: transaction costs allocated to equity (11,531) Effect of Business Combination, net of redemption and transaction costs $ 508,993 The Company issued equity classified common shares and certain liability classified earnout shares. Transaction costs of $3.3 million attributable to the liability classified earnout shares were expensed. The rest was attributable to the equity classified common shares and recorded as a reduction to Additional paid-in capital in the Consolidated Balance Sheets. The following table reconciles the elements of the Business Combination to the Consolidated Statements of Changes in Stockholders’ Equity for the year ended December 31, 2021 (in thousands): Recapitalization Cash – DCRB trust and cash, net of redemptions and liabilities recorded by DCRB of $24.9 million $ 179,727 Cash – PIPE Financing, net of transaction costs of $14.2 million 340,797 Conversion of convertible notes into common stock 50,198 Recognize earnout liability (188,373) Recognize Private Placement Warrants liability (19,395) Recapitalization of Legacy Hyzon common shares 75 Less: transaction costs allocated to equity (11,531) Effect of Business Combination, net of redemption and transaction costs $ 351,498

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2021
Summary of Contract Liabilities	Significant changes in the contract liabilities balances including cash received from 62 FCEV arrangement in China are as follows (in thousands): Year Ended For the period Contract liabilities - beginning of period $ 2,608 $ — Increases during the period 9,257 2,608 Revenue recognized, included in the contract liability balance in the beginning of the period — — Contract liabilities - end of period $ 11,865 $ 2,608

Inventory (Tables)

Inventory (Tables)	12 Months Ended
	Dec. 31, 2021
Inventory Disclosure [Abstract]
Summary Inventory consisted	Inventory consisted of the following (in thousands): December 31, December 31, Raw materials $ 16,099 $ — Work in process 4,828 — Total inventory $ 20,927 $ —

Prepaid Expenses and Other Cu_2

Prepaid Expenses and Other Current Assets (Tables)	12 Months Ended
	Dec. 31, 2021
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): December 31, December 31, Deposit for fuel cell components (see Note 18) $ 5,008 $ — Vehicle inventory deposits 10,171 577 Production equipment deposits 1,169 — Other prepaid expenses 3,266 271 Prepaid insurance 5,079 — VAT receivable from government 2,159 — Total prepaid expenses and other current assets $ 26,852 $ 848

Property, Plant, and Equipmen_2

Property, Plant, and Equipment, net (Tables)	12 Months Ended
	Dec. 31, 2021
Schedule of Property, Plant and Equipment	Property, plant, and equipment, net consisted of the following (in thousands): December 31, December 31, Land and building $ 2,818 $ — Machinery and equipment 8,827 371 Software 507 — Leasehold improvements 746 — Construction in progress 2,139 60 Total Property, plant, and equipment 15,037 431 Less: Accumulated depreciation and amortization (691) (13) Property, plant and equipment, net $ 14,346 $ 418

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2021
Accrued Liabilities [Abstract]
Summary of Accounts Payable and Accrued Liabilities	Accrued liabilities consisted of the following (in thousands): December 31, December 31, Payroll and payroll related expenses $ 2,250 $ 54 Accrued professional fees 2,450 900 Other accrued expenses 2,070 108 Accrued liabilities $ 6,770 $ 1,062

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2021
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Income (loss) before income taxes is summarized as follows (in thousands): Year Ended For the period US $ 14,380 $ (13,863) Non-US (31,273) (513) Total $ (16,893) $ (14,376)
Schedule of Reconciliation of Statutory Tax Rate and Effective Tax Rate	A reconciliation of the Company’s effective income tax rate is as follows: Year Ended For the period Federal tax at a statutory rate 21.0 % 21.0 % Earnings taxed at other than Federal statutory rate 7.8 0.3 Non-deductible interest expense (6.5) 0.0 Section 162(m) (41.6) 0.0 Change in fair value of earnout liability 110.4 0.0 Transaction costs 6.1 0.0 Deferred tax adjustments 3.7 0.0 Tax basis in acquired IP 13.2 0.0 Other 4.1 0.0 Change in valuation allowance (118.2) (21.3) Income tax provision 0.0 % 0.0 %
Schedule of Deferred Income Tax Assets and Liabilities	Deferred income tax assets and liabilities are summarized as follows (in thousands): December 31, December 31, Deferred income tax assets: Net operating loss carryforwards $ 15,124 $ 931 Revenue recognition basis difference 3,658 — Stock-based compensation 1,072 2,097 Lease liabilities 2,550 378 Tax basis in acquired IP 2,078 — Other accruals 1,117 — Deferred income tax assets - total 25,599 3,406 Deferred income tax liabilities: Property and equipment (144) (4) Right of use assets (2,450) (348) Deferred income tax liabilities - total (2,594) (352) Deferred income tax assets, net 23,005 3,054 Less: Valuation allowance 23,005 3,054 Deferred income taxes, net $ — $ — Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes as well as carryforward tax losses. At December 31, 2021, the Company had U.S. federal and foreign net operating loss carryforwards (“NOLs”) of $53.0 million and $14.4 million, respectively, to be used to offset future taxable income. The entire $53.0 million of U.S federal losses and $12.0 million of foreign losses can be carried forward indefinitely; the remaining $2.4 million of foreign losses expire on various dates through 2026.
Summary of Valuation Allowances	The following table summarizes the activity related to the Company’s valuation allowances (in thousands): December 31, December 31, Valuation Allowances - beginning of period $ 3,054 $ — Local currency increase in reserve 19,951 3,054 Valuation Allowances - end of period $ 23,005 $ 3,054

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2021
Summary of Assets and Liabilities that are Measured at Fair Value on a Recurring Basis	The following table presents information about the Company’s assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2021 and indicates the fair value hierarchy of the valuation inputs the Company utilized to determine such fair value (in thousands): Fair Value Measurements on a Recurring Basis Level 1 Level 2 Level 3 Total Warrant liability – Private Placement Warrants $ — $ 15,228 $ — $ 15,228 Earnout shares liability — — 103,761 103,761
Private Placements Warrants [Member]
Summary of Quantitative Information Regarding Level 3 Fair Value Measurement Inputs	The following table provides quantitative information regarding Level 3 fair value measurement inputs: Assumption July 16, Stock price $ 10.33 Exercise price (strike price) $ 11.50 Risk-free interest rate 0.8% Volatility 34.2% Remaining term (in years) 5.00
Summary of the Changes in the Liability for Private Placement Warrants	The following table presents the changes in the liability for Private Placement Warrants during the year ended December 31, 2021 (in thousands): Balance as of July 16, 2021 $ 19,395 Change in estimated fair value (4,167) Balance as of December 31, 2021 $ 15,228
Earnout shares liability [Member]
Summary of Quantitative Information Regarding Level 3 Fair Value Measurement Inputs	The following table provides quantitative information regarding Level 3 fair value measurement inputs: Assumption December 31, July 16, Stock price $ 6.49 $ 10.33 Risk-free interest rate 1.2% 0.8% Volatility 90.0% 90.0% Remaining term (in years) 4.54 5.00
Summary of the Changes in the Liability for Private Placement Warrants	The following table presents the changes in earnout liability during the twelve months ended December 31, 2021 (in thousands): Balance as of July 16, 2021 $ 188,373 Change in estimated fair value (84,612) Balance as of December 31, 2021 $ 103,761

Stock-based Compensation Plans

Stock-based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2021
Schedule Of Share Based Compensation Stock Options Activity Restricted Stock Units Award Activity	The following table summarizes the Company’s stock option and RSU activity: Stock Options RSUs Number of Weighted Weighted Aggregate Number of Weighted Outstanding at December 31, 2020⁽¹⁾ 19,826,031 $ 1.13 — $ — Granted 281,748 $ 1.13 2,799,657 $ 6.03 Exercised or released (436,037) $ (1.22) (428,107) $ 6.28 Forfeited/Cancelled (360,602) $ (1.13) (518,865) $ 5.39 Outstanding at December 31, 2021 19,311,140 $ 1.29 13.07 100,885 1,852,685 $ 6.14 Vested and expected to vest, December 31, 2021 13,773,623 $ 1.13 12.69 74,322 1,852,685 $ 6.14 Exercisable and vested at December 31, 2021 12,126,266 $ 1.13 13.39 65,013
Schedule of Assumptions to Estimate Fair Value of Stock Options	The following table discloses the assumptions, or range of assumptions, utilized for stock options for each of the grant years as follows: 2021 2020 Expected term of options (years) 5.0 0.4 to 5.0 Risk free interest rate 0.79% 0.1-0.4% Volatility 90% 90% Expected dividend $ 0.00 $ 0.00 As of December 31, 2021, there was $2.1 million of unrecognized stock-based compensation expense related to unvested stock options, which is expected to be recognized over a weighted-average period of 4.58 years. Restricted stock units granted under the Plans typically vest over a four or five-year period beginning on the date of grant. Restricted stock units will be settled through the issuance of an equivalent number of shares of the Company's common stock and are equity classified. The fair value of restricted shares is determined based upon the stock price on the date of grant. As of December 31, 2021, unrecognized compensation costs related to nonvested RSUs of $10.1 million is expected to be recognized over a remaining weighted average period of 3.69 years. Executives’ Awards On November 12, 2020, included in the stock options discussed above, 11,075,000 options were granted to the Company’s Executive Chairman which vest in two equal tranches and have a contractual term of 15 years. The first tranche vested on the grant date, are immediately exercisable, have an exercise price of $1.13 per share, and resulted in $4.9 million of compensation expense during 2020. The second tranche contains performance and market conditions for vesting which require an exit event of Horizon at escalating minimum equity values each year, within six years. The exercise price for the second tranche is initially $1.13 per share but increases by $0.56 per share each year during which the award remains outstanding. The fair value of the second tranche was estimated as of the grant date using a Monte Carlo simulation with key assumptions beyond those typical of option pricing models described below including the probability of achieving a Horizon exit at the required valuation in each year of the six year period. The grant date fair value of the second tranche is estimated to be $1.2 million which may or may not be recognized in the future depending on the outcome of the conditions for vesting. Additionally, on November 12, 2020, included in the stock options discussed above, 5,537,500 options were granted to the Company’s CEO which have a contractual term of 15 years, are immediately exercisable, and have an exercise price of $1.13 per share. Half of this award is subject to a two-year transferability restriction for the underlying shares of common stock, which resulted in a discount on the fair value of common stock assumption used in the determination of the fair value of this portion of the award. The grant date fair value of this award was determined using a Black Scholes option pricing model and resulted in $4.5 million of compensation expense for the period from January 21, 2020 (inception) through December 31, 2020. For the awards described above which vested immediately, the following table discloses the assumptions utilized in the Black Scholes option pricing model: Expected volatility 90% Expected dividend $ 0.00 Weighted average expected term (in years) 7.5 Risk-free rate 68%

Loss per Share (Tables)

Loss per Share (Tables)	12 Months Ended
	Dec. 31, 2021
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the information used in the calculation of the Company's basic and diluted earnings (loss) per share attributable to Hyzon common stockholders (in thousands, except per share data): Year Ended For the period Net loss attributable to Hyzon $ (12,141) $ (14,271) Weighted average shares outstanding: Basic 203,897 152,650 Effect of dilutive securities — — Diluted 203,897 152,650 Net loss per share attributable to Hyzon: Basic $ (0.06) $ (0.09) Diluted $ (0.06) $ (0.09)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	The following outstanding common stock equivalents (in thousands) were excluded from the computation of diluted net loss per share for the periods presented because including them would have been anti-dilutive. Year Ended For the Period Restricted stock units 1,853 — Stock options with service conditions 12,001 14,288 Stock options for former CTO 1,772 — Stock options with market and performance conditions 5,538 5,538 Private placement warrants 8,015 — Public warrants 11,286 — Earnout shares 23,250 — Hongyun warrants 31 — Ardour warrants 275 —

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2021
Schedule of Supplemental Balance Sheet Information Related to Leases	The following table presents supplemental balance sheet information related to leases (in thousands): December 31, December 31, Operating leases: Operating lease right-of-use assets $ 9,933 $ 943 Operating lease liabilities $ (10,062) $ (942) Finance leases: Finance lease right-of-use assets $ 332 $ 713 Finance lease liabilities $ (654) $ (857) Weighted average remaining lease term: Operating leases 7.3 years 4.9 years Finance leases 1.4 years 2.4 years Weighted average discount rate: Operating leases 5.7 % 7.1 % Finance leases 7.0 % 6.9 %
Schedule of Components of Lease Cost	The components of the lease expenses are as follows (in thousands): Year Ended For the period Operating lease cost $ 862 $ 19 Variable lease cost 205 30 Finance lease cost: Amortization of right-of-use assets 381 172 Interest on lease liabilities 53 35 Total lease cost $ 1,501 $ 256
Summary of Supplemental Cash Flow Information Related to Leases	Supplemental cash flows information related to leases is as follows (in thousands): Year Ended For the period Cash paid for amount included in the measurement of lease liabilities: Operating cash flows from operating leases $ 739 $ 19 Operating cash flows from finance leases $ 53 $ 35 Financing cash flows from finance leases $ 203 $ 29 Right-of-use assets obtained in exchange for new lease liabilities: Operating leases $ 9,588 $ 780 Finance leases $ — $ 886
Schedule of Maturities of Lease Liabilities	The maturities of operating and finance lease liabilities (excluding short-term leases) are as follows (in thousands): As of December 31, Operating Finance 2022 $ 1,978 $ 448 2023 1,894 240 2024 1,806 — 2025 1,745 — 2026 and thereafter 4,737 — Total minimum lease payments 12,160 688 Less: imputed interest 2,098 34 Present value of lease obligations 10,062 654 Less: current portion 1,453 433 Long-term portion of lease obligations $ 8,609 $ 221

Nature of Business and Basis _2

Nature of Business and Basis of Presentation - Additional Information (Detail) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) vehicle	Dec. 31, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated deficit	$ 14,300	$ (26,400)	$ 14,300
Cash and cash equivalents		445,100
Net income (loss)	14,376	16,893	$ (16,900)
Cash flows used in operating activities	$ (1,182)	(94,307)
Reverse Recapitalization, Net		$ 509,000
Number of Reportable Segments | vehicle		1
Number of Operating Segments | vehicle		1

Restatement of Previously Iss_3

Restatement of Previously Issued Financial Statements - Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Jan. 20, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash	$ 445,146	$ 17,139
Accounts receivable	2,956	0
Related party receivable	264	0
Inventory	20,927	0
Prepaid expenses and other current assets	26,852	848
Total current assets	496,145	17,987
Property, plant, and equipment, net	14,346	418
Right-of-use assets	10,265	1,656
Investments in equity securities	4,948	122
Other assets	4,575	822
Total Assets	530,279	21,005
Accounts payable	7,980	215
Accrued liabilities	6,770	1,062
Related party payables	3,695	560
Contract liabilities	10,925	2,608	$ 0
Current portion of lease liabilities	1,886	618
Total current liabilities	31,256	5,063
Lease liabilities	8,830	1,181
Private placement warrant liability	15,228
Earnout liability	103,761
Other liabilities	1,139
Total liabilities	160,214	6,244
Common stock, $0.0001 par value; 400,000,000 shares authorized, 247,758,412 and 166,125,000 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively.	25	17
Additional paid-in capital	400,826	29,122
Accumulated deficit	(26,412)	(14,271)
Accumulated other comprehensive income (loss)	378	(16)
Total Hyzon Motors Inc. stockholders’ equity	374,817	14,852
Noncontrolling interest	(4,752)	(91)
Total Stockholders’ Equity	370,065	14,761	$ 84
Total Liabilities and Stockholders’ Equity	530,279	$ 21,005
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash	445,146
Accounts receivable	2,598
Related party receivable	264
Inventory	19,245
Prepaid expenses and other current assets	27,970
Total current assets	495,223
Property, plant, and equipment, net	14,311
Right-of-use assets	10,265
Investments in equity securities	4,948
Other assets	5,430
Total Assets	530,177
Accounts payable	8,430
Accrued liabilities	6,026
Related party payables	3,633
Contract liabilities	11,230
Current portion of lease liabilities	1,886
Total current liabilities	31,205
Lease liabilities	8,830
Private placement warrant liability	15,228
Earnout liability	103,761
Other liabilities	1,296
Total liabilities	160,320
Common stock, $0.0001 par value; 400,000,000 shares authorized, 247,758,412 and 166,125,000 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively.	25
Additional paid-in capital	403,016
Accumulated deficit	(28,117)
Accumulated other comprehensive income (loss)	373
Total Hyzon Motors Inc. stockholders’ equity	375,297
Noncontrolling interest	(5,440)
Total Stockholders’ Equity	369,857
Total Liabilities and Stockholders’ Equity	530,177
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cash	0
Accounts receivable	358
Related party receivable	0
Inventory	1,682
Prepaid expenses and other current assets	(1,118)
Total current assets	922
Property, plant, and equipment, net	35
Right-of-use assets	0
Investments in equity securities	0
Other assets	(855)
Total Assets	102
Accounts payable	(450)
Accrued liabilities	744
Related party payables	62
Contract liabilities	(305)
Current portion of lease liabilities	0
Total current liabilities	51
Lease liabilities	0
Private placement warrant liability	0
Earnout liability	0
Other liabilities	(157)
Total liabilities	(106)
Common stock, $0.0001 par value; 400,000,000 shares authorized, 247,758,412 and 166,125,000 shares issued and outstanding as of December 31, 2021 and December 31, 2020, respectively.	0
Additional paid-in capital	(2,190)
Accumulated deficit	1,705
Accumulated other comprehensive income (loss)	5
Total Hyzon Motors Inc. stockholders’ equity	(480)
Noncontrolling interest	688
Total Stockholders’ Equity	208
Total Liabilities and Stockholders’ Equity	102
Revision of Prior Period, Error Correction, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accounts receivable	400
Inventory	(400)
Accrued liabilities	200
Other liabilities	$ 700

Restatement of Previously Iss_4

Restatement of Previously Issued Financial Statements - Consolidated Statement of Operations and Comprehensive Loss (Details) - USD ($) $ / shares in Units, $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ (80)
Cost of revenue		15,634
Research and development	$ 1,446	15,461
Selling, general, and administrative	12,785	67,853
Total operating expenses	14,231	98,948
Loss from operations	(14,231)	(99,028)
Change in fair value of private placement warrant liability		4,167
Change in fair value of earnout liability		84,612
Foreign currency exchange loss and other expense	(108)	(1,409)
Interest expense, net	(37)	(5,235)
Total other income (expense)	(145)	82,135
Net loss	(14,376)	(16,893)	$ 16,900
Less: Net loss attributable to noncontrolling interest	(105)	(4,752)
Net loss attributable to Hyzon	(14,271)	(12,141)
Foreign currency translation adjustment	(20)	485
Comprehensive loss	(14,396)	(16,408)
Less: Comprehensive loss attributable to noncontrolling interest	(109)	(4,661)
Comprehensive loss attributable to Hyzon	$ (14,287)	$ (11,747)
Net loss attributable to Hyzon per share:
Basic (in usd per share)	$ (0.09)	$ (0.06)
Diluted (in usd per share)	$ (0.09)	$ (0.06)
Weighted average common shares outstanding:
Basic (in shares)	152,650,000	203,897,000
Diluted (in shares)	152,650,000	203,897,000
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ 6,049
Cost of revenue		21,191
Research and development		16,443
Selling, general, and administrative		69,792
Total operating expenses		107,426
Loss from operations		(101,377)
Change in fair value of private placement warrant liability		4,167
Change in fair value of earnout liability		84,612
Foreign currency exchange loss and other expense		(1,452)
Interest expense, net		(5,235)
Total other income (expense)		82,092
Net loss		(19,285)
Less: Net loss attributable to noncontrolling interest		(5,439)
Net loss attributable to Hyzon		(13,846)
Foreign currency translation adjustment		479
Comprehensive loss		(18,806)
Less: Comprehensive loss attributable to noncontrolling interest		(5,349)
Comprehensive loss attributable to Hyzon		$ (13,457)
Net loss attributable to Hyzon per share:
Basic (in usd per share)		$ (0.07)
Diluted (in usd per share)		$ (0.07)
Weighted average common shares outstanding:
Basic (in shares)		203,897,000
Diluted (in shares)		203,897,000
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ (6,129)
Cost of revenue		(5,557)
Research and development		(982)
Selling, general, and administrative		(1,939)
Total operating expenses		(8,478)
Loss from operations		2,349
Change in fair value of private placement warrant liability		0
Change in fair value of earnout liability		0
Foreign currency exchange loss and other expense		43
Interest expense, net		0
Total other income (expense)		43
Net loss		2,392
Less: Net loss attributable to noncontrolling interest		687
Net loss attributable to Hyzon		1,705
Foreign currency translation adjustment		6
Comprehensive loss		2,398
Less: Comprehensive loss attributable to noncontrolling interest		688
Comprehensive loss attributable to Hyzon		$ 1,710
Net loss attributable to Hyzon per share:
Basic (in usd per share)		$ 0.01
Diluted (in usd per share)		$ 0.01
Weighted average common shares outstanding:
Basic (in shares)		0
Diluted (in shares)		0

Restatement of Previously Iss_5

Restatement of Previously Issued Financial Statements - Consolidated Statements of Stockholders' Equity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Jan. 20, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	$ 370,065	$ 14,761	$ 84
Additional Paid-in Capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	400,826	29,122	69
Retained Earnings (Accumulated Deficit)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	(26,412)	(14,271)	0
Accumulated Other Comprehensive Loss
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	378	(16)	0
Total Hyzon Motors Inc. Stockholders’ Equity (Deficit)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	374,817	14,852	84
Noncontrolling Interest
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	$ (4,752)	$ (91)	$ 0
Common Stock Class A | Common Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance (in shares)	247,758,412	166,125,000	148,405,000
Balance	$ 25	$ 17	$ 15
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	369,857
As Previously Reported | Additional Paid-in Capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	403,016
As Previously Reported | Retained Earnings (Accumulated Deficit)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	(28,117)
As Previously Reported | Accumulated Other Comprehensive Loss
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	373
As Previously Reported | Total Hyzon Motors Inc. Stockholders’ Equity (Deficit)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	375,297
As Previously Reported | Noncontrolling Interest
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	$ (5,440)
As Previously Reported | Common Stock Class A | Common Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance (in shares)	247,758,412
Balance	$ 25
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	208
Restatement Adjustments | Additional Paid-in Capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	(2,190)
Restatement Adjustments | Retained Earnings (Accumulated Deficit)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	1,705
Restatement Adjustments | Accumulated Other Comprehensive Loss
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	5
Restatement Adjustments | Total Hyzon Motors Inc. Stockholders’ Equity (Deficit)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	(480)
Restatement Adjustments | Noncontrolling Interest
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	$ 688
Restatement Adjustments | Common Stock Class A | Common Stock
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance (in shares)	0
Balance	$ 0

Restatement of Previously Iss_6

Restatement of Previously Issued Financial Statements - Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities:
Net loss		$ (14,376)	$ (16,893)	$ 16,900
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		185	1,140
Stock-based compensation		9,983	30,087
Loss on extinguishment of convertible notes			107
Noncash interest expense			5,224
Issuance of warrants			188
Change in fair value of private placement warrant liability			4,167
Fair value adjustment of earnout liability			(84,612)
Changes in operating assets and liabilities:
Accounts receivable			(2,971)
Inventory			(20,958)
Prepaid expenses and other current assets		(824)	(24,937)
Other assets		0	(169)
Accounts payable		215	8,526
Accrued liabilities		467	4,891
Related party payables		560	(227)
Contract liabilities		2,608	9,318
Other liabilities			1,146
Net cash used in operating activities		(1,182)	(94,307)
Cash Flows from Investing Activities:
Purchases of property and equipment		(431)	(14,560)
Advanced payments for capital expenditures			(1,172)
Investment in non-consolidated affiliates		(122)	(4,826)
Investment in equity securities			(98)
Net cash used in investing activities		(553)	(20,656)
Cash Flows from Financing Activities:
Proceeds from issuance of common stock, net of transaction costs		18,560	0
Proceeds from Business Combination, net of redemption and transaction costs (Note 4)			508,993
Payment for purchase of Horizon IP			(6,900)
Exercise of stock options			532
Payment of finance lease liability		(29)	(203)
Debt issuance costs			(133)
Repurchase of warrants			(540)
Deferred transaction costs		(137)	0
Proceeds from issuance of convertible notes	$ 45,000	500	45,000
Net cash provided by financing activities		18,894	546,749
Effect of exchange rate changes on cash		(20)	440
Net change in cash and restricted cash		17,139	432,226
Cash—Beginning			17,139
Cash and restricted cash—Ending		17,139	449,365	17,139
Supplemental schedule of non-cash investing activities and financing activities:
Conversion of Legacy Hyzon Common Stock			73
Recognition of earnout liability in Business Combination			188,373
Recognition of Private Placement Warrant liability in Business Combination			19,395
Horizon IP Agreement - Fee			10,000
Conversion of convertible notes for common stock			50,198
Acquisitions of property and equipment included in current liabilities			61
As Previously Reported
Cash Flows from Operating Activities:
Net loss			(19,285)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization			1,140
Stock-based compensation			29,148
Loss on extinguishment of convertible notes			107
Noncash interest expense			5,224
Issuance of warrants			188
Change in fair value of private placement warrant liability			4,167
Fair value adjustment of earnout liability			(84,612)
Changes in operating assets and liabilities:
Accounts receivable			(2,614)
Inventory			(19,276)
Prepaid expenses and other current assets			(22,970)
Other assets			(1,023)
Accounts payable			8,164
Accrued liabilities			4,966
Related party payables			(290)
Contract liabilities			8,684
Other liabilities			1,425
Net cash used in operating activities			(95,191)
Cash Flows from Investing Activities:
Purchases of property and equipment			(14,525)
Advanced payments for capital expenditures			(4,257)
Investment in non-consolidated affiliates			(4,826)
Investment in equity securities			(98)
Net cash used in investing activities			(23,706)
Cash Flows from Financing Activities:
Proceeds from issuance of common stock, net of transaction costs			0
Proceeds from Business Combination, net of redemption and transaction costs (Note 4)			512,936
Payment for purchase of Horizon IP			(6,900)
Exercise of stock options			532
Payment of finance lease liability			(203)
Debt issuance costs			(133)
Repurchase of warrants			(540)
Deferred transaction costs			0
Proceeds from issuance of convertible notes			45,000
Net cash provided by financing activities			550,692
Effect of exchange rate changes on cash			431
Net change in cash and restricted cash			432,226
Cash—Beginning			17,139
Cash and restricted cash—Ending		17,139	449,365	17,139
Supplemental schedule of non-cash investing activities and financing activities:
Conversion of Legacy Hyzon Common Stock			73
Recognition of earnout liability in Business Combination			188,373
Recognition of Private Placement Warrant liability in Business Combination			19,395
Horizon IP Agreement - Fee			10,000
Conversion of convertible notes for common stock			50,198
Acquisitions of property and equipment included in current liabilities			61
Restatement Adjustments
Cash Flows from Operating Activities:
Net loss			2,392
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization			0
Stock-based compensation			939
Loss on extinguishment of convertible notes			0
Noncash interest expense			0
Issuance of warrants			0
Change in fair value of private placement warrant liability			0
Fair value adjustment of earnout liability			0
Changes in operating assets and liabilities:
Accounts receivable			(357)
Inventory			(1,682)
Prepaid expenses and other current assets			(1,967)
Other assets			854
Accounts payable			362
Accrued liabilities			(75)
Related party payables			63
Contract liabilities			634
Other liabilities			(279)
Net cash used in operating activities			884
Cash Flows from Investing Activities:
Purchases of property and equipment			(35)
Advanced payments for capital expenditures			3,085
Investment in non-consolidated affiliates			0
Investment in equity securities			0
Net cash used in investing activities			3,050
Cash Flows from Financing Activities:
Proceeds from issuance of common stock, net of transaction costs			0
Proceeds from Business Combination, net of redemption and transaction costs (Note 4)			(3,943)
Payment for purchase of Horizon IP			0
Exercise of stock options			0
Payment of finance lease liability			0
Debt issuance costs			0
Repurchase of warrants			0
Deferred transaction costs			0
Proceeds from issuance of convertible notes			0
Net cash provided by financing activities			(3,943)
Effect of exchange rate changes on cash			9
Net change in cash and restricted cash			0
Cash—Beginning			0
Cash and restricted cash—Ending		$ 0	0	$ 0
Supplemental schedule of non-cash investing activities and financing activities:
Conversion of Legacy Hyzon Common Stock			0
Recognition of earnout liability in Business Combination			0
Recognition of Private Placement Warrant liability in Business Combination			0
Horizon IP Agreement - Fee			0
Conversion of convertible notes for common stock			0
Acquisitions of property and equipment included in current liabilities			$ 0

Restatement of Previously Iss_7

Restatement of Previously Issued Financial Statements - Narrative (Details) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) vehicle	Sep. 30, 2021 USD ($)	Jan. 20, 2020 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ (80)
Cost of revenue		15,634
Selling, general, and administrative	$ 12,785	67,853
Prepaid expenses and other current assets	848	26,852
Other assets	822	4,575
Other liabilities		1,139
Contract liabilities	2,608	10,925		$ 0
Research and development	1,446	15,461
Inventory	0	20,927
Accrued liabilities	1,062	6,770
Related party payables	560	$ 3,695
Number of vehicles delivered | vehicle		62
Number Of Vehicles, Performance Obligations Fully Satisfied | vehicle		62
Number of Vehicles, Performance Obligation Not Fully Satisfied | vehicle		20
VAT receivable from government		$ 2,159
Contract liabilities - end of period	2,608	11,865
Balance	14,761	370,065		84
Additional Paid-in Capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance	$ 29,122	$ 400,826		$ 69
Hyzon Europe
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of vehicles delivered | vehicle		5
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ 6,049
Cost of revenue		21,191
Selling, general, and administrative		69,792
Prepaid expenses and other current assets		27,970
Other assets		5,430
Other liabilities		1,296
Contract liabilities		11,230
Research and development		16,443
Inventory		19,245
Accrued liabilities		6,026
Related party payables		3,633
VAT receivable from government		1,800
Balance		369,857
As Previously Reported | Additional Paid-in Capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance		403,016
Restatement Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		(6,129)
Cost of revenue		(5,557)
Selling, general, and administrative		(1,939)
Prepaid expenses and other current assets		(1,118)
Other assets		(855)
Other liabilities		(157)
Contract liabilities		(305)
Research and development		(982)
Inventory		1,682
Accrued liabilities		744
Business combination transaction costs			$ 3,100
Related party payables		62
Balance		208
Restatement Adjustments | Additional Paid-in Capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance		(2,190)
Restatement Adjustments | Hyzon China
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		4,000
Cost of revenue		3,100
Selling, general, and administrative		300
Prepaid expenses and other current assets		900
Other assets		900
Other liabilities		900
Contract liabilities		2,500
Inventory		2,900
Accrued liabilities		700
Restatement Adjustments | Hyzon Europe
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		(2,100)
Cost of revenue		2,500
Selling, general, and administrative		100
Contract liabilities		(1,900)
Research and development		(800)
Inventory		(900)
Accrued liabilities		(100)
Revision of Prior Period, Error Correction, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general, and administrative		900
Other liabilities		700
Research and development		(200)
Inventory		(400)
Accrued liabilities		200
Prepaid Expense		200
Accounts Payable		400
Contract liabilities - end of period		900
Revision of Prior Period, Error Correction, Adjustment | Additional Paid-in Capital
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Balance		$ 900

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	2 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 30, 2020
Summary of Significant Accounting Policies Details [Line Items]
Restricted cash	$ 4,200	$ 0	$ 4,200
Assets	530,279	21,005	530,279
Liabilities	160,214	6,244	160,214
Allowance for credit losses on accounts receivable current	0	0	0
Impairment losses on long lived assets held for use		$ 0	$ 0
Percentage of income tax benefit to be realized for recognition in the income statement		50%	50%
Foreign currency exchange loss and other expense		$ 1,300	$ 1,300
Warranty obligations	800		800
Hyzon Foshan New Energy Technology [Member]
Summary of Significant Accounting Policies Details [Line Items]
Assets	$ 1,600		$ 1,600
Hyzon Foshan New Energy Technology [Member] | Foshan Zangbong Earthwork Engineering Company Limited [Member]
Summary of Significant Accounting Policies Details [Line Items]
Variable interest entity, percentage ownership	44%
Hyzon Foshan New Energy Technology [Member] | Foshan JV Shareholders [Member]
Summary of Significant Accounting Policies Details [Line Items]
Variable interest entity, percentage ownership	5%
Hyzon Foshan New Energy Technology [Member] | Hyzon Automotive Technology Company Limited [Member]
Summary of Significant Accounting Policies Details [Line Items]
Variable interest entity, percentage ownership	51%
Hyzon Europe
Summary of Significant Accounting Policies Details [Line Items]
Assets		$ 1,000
Ownership interest				50.50%
Holthausen [Member]
Summary of Significant Accounting Policies Details [Line Items]
Ownership interest				49.50%
Maximum [Member]
Summary of Significant Accounting Policies Details [Line Items]
Term of product warrant		6 years
Minimum [Member]
Summary of Significant Accounting Policies Details [Line Items]
Term of product warrant			1 year
Variable Interest Entity, Primary Beneficiary [Member]
Summary of Significant Accounting Policies Details [Line Items]
Variable interest entity, percentage ownership	51%
Variable Interest Entity, Primary Beneficiary [Member] | Hyzon Europe
Summary of Significant Accounting Policies Details [Line Items]
Variable interest entity, percentage ownership		50.50%	50.50%
Assets	$ 49,500		$ 49,500
Liabilities	$ 13,100	$ 1,200	$ 13,100

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary Depreciation is recorded on a straight-line basis over the shorter of the lease term (Details)	12 Months Ended
	Dec. 31, 2021
Building Improvements [Member]
Accounting Policies [Line Items]
Property plant and equipment useful life	30 years
Leasehold improvements [Member]
Accounting Policies [Line Items]
Property plant and equipment useful life	5 years
Machinery and Equipment [Member]
Accounting Policies [Line Items]
Property plant and equipment useful life	7 years
Software Development [Member] | Maximum [Member]
Accounting Policies [Line Items]
Property plant and equipment useful life	5 years
Software Development [Member] | Minimum [Member]
Accounting Policies [Line Items]
Property plant and equipment useful life	3 years
Vehicles [Member]
Accounting Policies [Line Items]
Property plant and equipment useful life	5 years

Business Combination - Summary

Business Combination - Summary of the Elements of the Business Combination to the Condensed Statements (Detail)	12 Months Ended
	Dec. 31, 2021 USD ($) shares
Business Combination, Separately Recognized Transactions [Line Items]
Less: transaction costs allocated to equity	$ (11,531)
Effect of Business Combination, net of redemption and transaction costs	508,993
Effect of Business Combination, net of redemption and transaction costs	351,498
Conversion of convertible notes into common stock	50,198
Recognize earnout liability	(188,373)
Recognize private placement warrants liability	(19,395)
Recapitalization of Legacy Hyzon common shares	75
Less: transaction costs allocated to equity	$ (11,531)
Business Combination [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	246,994,209
Ascent options [Member] | Business Combination [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	6,871,667
Legacy Hyzon [Member] | Business Combination [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	173,474,186
Conversion of Convertible Notes [Member] | Business Combination [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	5,022,052
DCRB trust [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Cash	$ 179,727
DCRB trust [Member] | Business Combination [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	26,126,304
PIPE Financing [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Cash	$ 340,797
PIPE Financing [Member] | Business Combination [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	35,500,000
Founders Shares [Member] | DCRB trust [Member] | Business Combination [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	5,643,125
Common Stock | Business Combination [Member] | Common Stock Class A
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	73,520,023
Common Stock | DCRB trust [Member] | Business Combination [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Shares of acquiree received | shares	20,483,179

Business Combination - Summar_2

Business Combination - Summary of the Elements of the Business Combination to the Condensed Statements, Narrative (Detail)		12 Months Ended
	Jul. 16, 2021 shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 shares
Business Combination, Separately Recognized Transactions [Line Items]
Busines combination trasaction costs expensed		$ 11,531
Common Stock, Shares, Outstanding | shares		247,758,412	166,125,000
Legacy Hyzon [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Common Stock, Shares, Outstanding | shares	97,897,396
Legacy Hyzon [Member] | Common Stock Class A
Business Combination, Separately Recognized Transactions [Line Items]
Stockholders equity note, stock split, conversion ratio	1.772
Liability Classified Earnout Shares [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Busines combination trasaction costs expensed		$ 3,300,000
DCRB trust [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Redemption of liabilities		24,900,000
PIPE Financing [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business combination transaction costs		$ 14,200,000

Business Combination - Addition

Business Combination - Additional Information (Detail)				11 Months Ended	12 Months Ended
		Jul. 16, 2021 USD ($) $ / shares shares	Oct. 22, 2020 $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares shares	Nov. 12, 2020 shares
Business Acquisition [Line Items]
Common stock, par value (in usd per share) | $ / shares				$ 0.0001	$ 0.0001
Common Stock, Capital Shares Reserved for Future Issuance						11,075,000
Common stock issued, value | $	[1]			$ 18,476,000
Recognize earnout liability | $					$ 188,373
Working capital loans | $					1,500,000
Business Combination Allocated Share Based Expense Related To Earnout Awards | $					14,000,000
Rights to shares (in shares) | $					19,300,742
Chief Executive Officer [Member]
Business Acquisition [Line Items]
Sale of stock in shares			514,500
Initial Public Offering
Business Acquisition [Line Items]
Sale of stock in shares			22,572,502
Private Placement [Member]
Business Acquisition [Line Items]
Working capital loans | $					$ 1,500,000
Sale of stock in shares			6,514,500
Sale of Stock, Price Per Share | $ / shares			$ 1
Stock Appreciation Rights (SARs)
Business Acquisition [Line Items]
Rights to shares (in shares) | $		$ 23,250,000
New Hyzon [Member]
Business Acquisition [Line Items]
Number of trading days for determining the share price					20 days
Number of consecutive trading days for determining the share price					30 days
Maximum earnout period					5 years
Maximum earnout shares issued					5,250,000
New Hyzon [Member] | Tranche One [Member]
Business Acquisition [Line Items]
Sale of stock price | $ / shares					$ 18
Number of shares issued					9,000,000
New Hyzon [Member] | Tranche Two [Member]
Business Acquisition [Line Items]
Sale of stock price | $ / shares					$ 20
Number of shares issued					9,000,000
New Hyzon [Member] | Tranche Three [Member]
Business Acquisition [Line Items]
Sale of stock price | $ / shares					$ 35
Number of shares issued					5,250,000
Ascent options [Member]
Business Acquisition [Line Items]
Business combination share based compensation by share based award exercise price per share of options excercised | $ / shares					$ 2.73
Business combination share based compensation by share based award number of shares as a result of options excercised before business combination					3,900,000
Business combination share based compensation by share based award number of shares as a result of options excercised after business combination					6,900,000
PIPE Financing [Member]
Business Acquisition [Line Items]
Debt instrument principal amount | $		$ 45,000,000
Percentage of price per share of converted shares equal to price per share paid by the pipe financing investors		90%
Debt instrument shares converted		5,022,052
Legacy Hyzon [Member]
Business Acquisition [Line Items]
Common stock, par value (in usd per share) | $ / shares		$ 0.001
Recognize earnout liability | $		$ 103,800,000			$ 188,400,000
Business Combination [Member]
Business Acquisition [Line Items]
Stock Issued During Period, Shares, New Issues					4,100,000
Common Stock Class A
Business Acquisition [Line Items]
Issued and outstanding share		246,994,209
Common Stock Class A | Stock options with market and performance conditions [Member]
Business Acquisition [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance		21.7
Common Stock Class A | PIPE Financing [Member]
Business Acquisition [Line Items]
Stock Issued During Period, Shares, New Issues		35,500,000
Sale of stock price | $ / shares		$ 10
Common stock issued, value | $		$ 355,000,000
Common Stock Class A | Legacy Hyzon [Member]
Business Acquisition [Line Items]
Common stock, par value (in usd per share) | $ / shares		$ 0.0001
Stockholders equity note, stock split, conversion ratio		1.772
Proceeds from issuance of common stock | $		$ 173,400,000
Common Stock Class A | Business Combination [Member]
Business Acquisition [Line Items]
Common stock was converted into, shares of common stock of the post-combination					7,200,000
[1]Issuance of common stock, net of issuance costs of $1,024 and conversion of convertible notes have been retroactively restated to give effect to the recapitalization transaction.

Revenue - Additional Informatio

Revenue - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) vehicle shares	Dec. 31, 2020 USD ($)	Jan. 20, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Remaining performance obligations	$ 19,700	$ 10,000
Common stock shares issued for vehicle deliveries | shares	31,000
Vesting of RSUs (in shares) | shares	8,300
Number of vehicles delivered | vehicle	62
Contract liabilities	$ 10,925	2,608	$ 0
Noncurrent contract liabilities	1,000	$ 0
Australasia Regions [Member] | Certain Customers in China [Member]
Disaggregation of Revenue [Line Items]
Revenue recognized	2,500
Fuel [Member] | European Union [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	100
Fuel [Member] | Australasia Regions [Member]
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ (200)

Revenue - Summary of Contract L

Revenue - Summary of Contract Liabilities (Details) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Contract with Customer, Liability [Abstract]
Contract liabilities - beginning of period	$ 0	$ 2,608
Increases net of amounts recognized as revenue during the period	2,608	9,257
Revenue recognized, included in the contract liability balance in the beginning of the period	0	0
Contract liabilities - end of period	$ 2,608	$ 11,865

Inventory - Summary Inventory C

Inventory - Summary Inventory Consisted (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 16,099	$ 0
Work in process	4,828	0
Total inventory	$ 20,927	$ 0

Prepaid Expenses and Other Cu_3

Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deposit for fuel cell components	$ 5,008	$ 0
Vehicle inventory deposits	10,171	577
Production equipment deposits	1,169	0
Other prepaids	3,266	271
Prepaid insurance	5,079	0
VAT receivable from government	2,159
Total prepaid expenses and other current assets	$ 26,852	$ 848

Property, Plant, and Equipmen_3

Property, Plant, and Equipment, net - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property plant equipment gross	$ 15,037	$ 431
Less: Accumulated depreciation and amortization	(691)	(13)
Property and equipment, net	14,346	418
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Property plant equipment gross	2,818
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property plant equipment gross	8,827	371
Software Development [Member]
Property, Plant and Equipment [Line Items]
Property plant equipment gross	507
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant equipment gross	746
Construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property plant equipment gross	$ 2,139	$ 60

Property, Plant, and Equipmen_4

Property, Plant, and Equipment, net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation and amortization expenses	$ 700
Property plant equipment gross	15,037	$ 431
Capitalized Machinery And Equipment
Property, Plant and Equipment [Line Items]
Property plant equipment gross	$ 1,400

Accrued Liabilities - Summary o

Accrued Liabilities - Summary of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Accrued Liabilities [Abstract]
Payroll and payroll related expenses	$ 2,250	$ 54
Accrued professional fees	2,450	900
Other accrued expenses	2,070	108
Accrued liabilities	$ 6,770	$ 1,062

Convertible Notes - Additional

Convertible Notes - Additional Information (Detail) - USD ($) $ in Thousands			1 Months Ended	11 Months Ended	12 Months Ended
	Oct. 19, 2020	Aug. 24, 2020	Feb. 28, 2021	Dec. 31, 2020	Dec. 31, 2021
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes			$ 45,000	$ 500	$ 45,000
Number of common shares					5,022,052
Convertible Notes [Member]
Debt Instrument [Line Items]
Interest rate					1%
Interest expenses					$ 200
Change in value of bifurcated embedded derivative					5,000
2020 Notes [Member]
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes		$ 500
Interest rate		10%
Amount of proceeds that would trigger conversion of convertible notes					10,000
Pre-money valuation					$ 175
Number of common shares	250,000

Investments in Equity Securit_2

Investments in Equity Securities - Additional Information (Detail) - USD ($) $ in Thousands			11 Months Ended	12 Months Ended
	Jul. 30, 2021	Jul. 29, 2021	Dec. 31, 2020	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity investment with no readily determinable fair value			$ 122	$ 4,948
Payment to acquire equity securities with no readily determinable fair value			122	4,826
Raven SR, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investment with no readily determinable fair value				2,500
Equity method investment, description of principal activities		Raven SR granted to the Company a right of first refusal to co-invest in up to 100 of Raven SR’s first 200 solid waste-to-hydrogen generation and production facilities hubs), and up to 150 of Raven SR’s gas-to-hydrogen generation and production facilities across the United States on a hub-by-hub basis.
Payment to acquire equity securities with no readily determinable fair value	$ 2,500
HYZNGlobal Nrg H2 Limited
Schedule of Equity Method Investments [Line Items]
Equity investment with no readily determinable fair value			$ 100	$ 2,500

Investments in Non-consolidat_2

Investments in Non-consolidated Affiliates - Additional Information (Detail)	Dec. 31, 2021
Jiushuang Hyzon Motor Services [Member] | Hyzon Chennai [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments ownership percentage	40%
Jiushuang Hyzon Logistics Limited [Member] | Hyzon Chennai [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments ownership percentage	25%
Maximum [Member] | Partially Owned Affiliates
Schedule of Equity Method Investments [Line Items]
Equity method investments ownership percentage	40%
Minimum [Member] | Partially Owned Affiliates
Schedule of Equity Method Investments [Line Items]
Equity method investments ownership percentage	25%

Income Taxes - Schedule Of Inco

Income Taxes - Schedule Of Income Before Income Tax Domestic And Foreign (Detail) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Income Before Income Tax Domestic And Foreign [Line Items]
Net loss	$ (14,376)	$ (16,893)	$ 16,900
UNITED STATES
Schedule Of Income Before Income Tax Domestic And Foreign [Line Items]
Net loss	(13,863)	14,380
Non-US [Member]
Schedule Of Income Before Income Tax Domestic And Foreign [Line Items]
Net loss	$ (513)	$ (31,273)

Income Taxes - Schedule of Reco

Income Taxes - Schedule of Reconciliation of Statutory Tax Rate and Effective Tax Rate (Detail)	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal tax at a statutory rate	21%	21%
Earnings taxed at other than Federal statutory rate	0.30%	7.80%
Non-deductible interest expense	0%	(6.50%)
Section 162(m)	0	0.416
Change in fair value of earnout liability	0	1.104
Transaction costs		6.10%	0%
Deferred tax adjustments		3.70%	0%
Tax basis in acquired IP	0	0.132
Other	0%	4.10%
Change in valuation allowance	(21.30%)	(118.20%)
Income tax provision	0%	0%

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Net operating loss carryforwards	$ 15,124	$ 931
Revenue recognition basis difference	3,658
Stock-based compensation	1,072	2,097
Lease liabilities	2,550	378
Tax basis in acquired IP	2,078
Other accruals	1,117
Deferred income tax assets - total	25,599	3,406
Deferred income tax liabilities:
Property and equipment	(144)	(4)
Right of use assets	(2,450)	(348)
Deferred income tax liabilities-total	(2,594)	(352)
Deferred income tax assets, net	23,005	3,054
Less: Valuation allowance	23,005	3,054
Deferred income taxes, net	$ 0	$ 0

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Unrecognized tax benefit	$ 0	$ 0
Accrued interest and penalties	0	$ 0
Federal [Member]
Net operating loss carryforwards	53,000,000
Deferred tax assets, operating loss carryforwards, not subject to expiration	53,000,000
Foreign [Member]
Net operating loss carryforwards	14,400,000
Deferred tax assets, operating loss carryforwards, not subject to expiration	12,000,000
Foreign [Member] | 2026 [Member]
Deferred tax assets, operating loss carryforwards, subject to expiration	$ (2,400,000)

Income Taxes - Summary of Valua

Income Taxes - Summary of Valuation Allowances (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Valuation Allowances - beginning of period	$ 3,054	$ 0
Local currency increase in reserve	19,951	3,054
Valuation Allowances - end of period	$ 23,005	$ 3,054

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Jul. 16, 2021
Private Placements Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability		$ 19,400
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earnout shares liability	$ 103,761
Fair Value, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Earnout shares liability	103,761
Fair Value, Recurring [Member] | Private Placements Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability	15,228
Fair Value, Recurring [Member] | Private Placements Warrants [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability	0
Fair Value, Recurring [Member] | Private Placements Warrants [Member] | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability	$ 15,228

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Quantitative Information Regarding Level 3 Fair Value Measurement Inputs (Detail) $ in Thousands	Dec. 31, 2021 USD ($) yr	Jul. 16, 2021 USD ($) yr
Private Placements Warrants [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		$ 19,400
Private Placements Warrants [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	$ 15,228
Private Placements Warrants [Member] | Fair Value, Inputs, Level 2 | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	$ 15,228
Private Placements Warrants [Member] | Stock price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input		10.33
Private Placements Warrants [Member] | Exercise price (strike price)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input		11.50
Private Placements Warrants [Member] | Risk-free interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input		0.8
Private Placements Warrants [Member] | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input		34.2
Private Placements Warrants [Member] | Remaining term (in years)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input | yr		5
Earnout shares liability [Member] | Stock price
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input	6.49	10.33
Earnout shares liability [Member] | Risk-free interest rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input	1.2	0.8
Earnout shares liability [Member] | Volatility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input	90	90
Earnout shares liability [Member] | Remaining term (in years)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants and rights outstanding, measurement input | yr	4.54	5

Fair Value Measurements - Sum_3

Fair Value Measurements - Summary of the Changes in the Liability for Private Placement Warrants (Detail) - USD ($) $ in Thousands	6 Months Ended	9 Months Ended
	Dec. 31, 2021	Dec. 31, 2021
Private Placements Warrants [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of July 16, 2021	$ 19,395
Change in estimated fair value	(4,167)
Balance as of December 31, 2021	15,228	$ 15,228
Earnout shares liability [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance as of July 16, 2021		188,373
Change in estimated fair value		(84,612)
Balance as of December 31, 2021	$ 103,761	$ 103,761

Commitments and Contingencies (

Commitments and Contingencies (Details)	2 Months Ended
	Nov. 15, 2021 lawsuit
Commitments and Contingencies Disclosure [Abstract]
Number Of Class Action Lawsuits	3

Stock-based Compensation Plan_2

Stock-based Compensation Plans - Additional Information (Detail) - USD ($)		12 Months Ended
	Nov. 12, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 24, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock	11,075,000
Options exercise period date of grant			15 years
Weighted Average Remaining Term (in Years), Outstanding as of December 31, 2020	15 years
Share-based compensation arrangement by share-based payment award, award vesting period		5 days
Share-based payment arrangement, expense	$ 4,900
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount		$ 2,100,000
Former CTO Retirement Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Related party transaction fees payable per month		$ 20,000,000
Share-based payment award, shares vested and expected to vest		1,772,000
Salary expense		$ 500,000
Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price	$ 1.13
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		3 years 8 months 8 days
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount		$ 10,100,000
Restricted Stock Units (RSUs) | Former CTO Retirement Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues		250,000
Share-based payment arrangement, expense		$ 13,400,000
Stock options with market and performance conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, options, grants in period, gross		281,748
Weighted Average Remaining Term (in Years), Outstanding as of December 31, 2020		13 years 25 days
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price	$ 1.13	$ 1.13
Share-based payment award, shares vested and expected to vest		12,126,266
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		4 years 6 months 29 days
Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock		16,250,000
Options exercise period date of grant		15 years
Share-based compensation arrangement by share-based payment award, options, grants in period, gross	5,537,500
Share-based compensation arrangement by share-based payment award, options, outstanding, period increase (decrease), weighted average exercise price	$ 0.56
Stock Incentive Plan [Member] | Share-based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangements by share-based payment award, options, grants in period, weighted average exercise price	$ 1.13
Share-based payment arrangement, expense	$ 4,500
Stock Incentive Plan [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment arrangement, expense	$ 1,200,000
2021 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved shares of common stock				23,226,543
Business combination share based compensation by share based payment award shares subject to outstanding awards converted into awards		21,339,493

Stock-based Compensation Plan_3

Stock-based Compensation Plans - Schedule of the Company's Stock Option And RSU Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Nov. 12, 2020	Dec. 31, 2021	Dec. 31, 2020
Weighted Average Remaining Term (in Years), Outstanding as of December 31, 2021	15 years
Employee Stock Option [Member]
Number of Options, Outstanding at December 31, 2020		19,826,031
Number of Options, Granted		281,748
Number of Options, Exercised or released		(436,037)
Number of Options, Forfeited/Cancelled		(360,602)
Number of Options, Outstanding as of December 31, 2021		19,311,140
Number of Options, Vested and expected to vest, December 31, 2021		13,773,623
Number of Options, Exercisable and vested at December 31, 2021		12,126,266
Weighted average exercise price, Outstanding as of December 31, 2020		$ 1.29	$ 1.13
Weighted average exercise price, Granted	$ 1.13	1.13
Weighted Average Exercise Price, Exercised or released		(1.22)
Weighted Average Exercise Price, Forfeited/Cancelled		(1.13)
Weighted Average Exercise Price, Vested and expected to vest, December 31, 2021		1.13
Weighted Average Exercise Price, Exercisable and vested at December 31, 2021		$ 1.13
Weighted Average Remaining Term (in Years), Outstanding as of December 31, 2021		13 years 25 days
Weighted Average Remaining Contractual (Years), Vested and expected to vest, December 31, 2021		12 years 8 months 8 days
Weighted Average Remaining Contractual (Years), Exercisable and vested at December 31, 2021		13 years 4 months 20 days
Aggregate Intrinsic Value, Outstanding at December 31, 2021		$ 100,885
Aggregate Intrinsic Value,Vested and expected to vest, December 31, 2021		74,322
Aggregate Intrinsic Value, Exercisable and vested at December 31, 2021		$ 65,013
Restricted Stock Units (RSUs)
Number of RSUs, Granted		2,799,657
Number of RSUs, Exercised or released		(428,107)
Number of RSUs, Forfeited/Cancelled		(518,865)
Number of RSUs, Outstanding at December 31, 2021		1,852,685
Number of RSUs, Vested and expected to vest, December 31, 2021		1,852,685
Weighted Average Grant Date Fair Value, Granted		$ 6.03
Weighted Average Grant Date Fair Value, Exercised or released		6.28
Weighted Average Grant Date Fair Value, Forfeited/Cancelled		5.39
Weighted Average Grant Date Fair Value, Vested and expected to vest, December 31, 2021		6.14
Weighted Average Grant Date Fair Value, Exercisable and vested at December 31, 2021		$ 6.14

Stock-based Compensation Plan_4

Stock-based Compensation Plans - Schedule of Assumptions to Estimate Fair Value of Stock Options (Detail)	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Share-based Payment Arrangement, Employee [Member]
Expected term of options (years)		5 years
Risk free interest rate		0.79%
Volatility	90%	90%
Expected dividend	0%	0%
Risk-free rate, minimum	0.10%
Risk-free rate. maximum	0.40%
Stock Incentive Plan [Member]
Expected term of options (years)		7 years 6 months
Risk free interest rate		68%
Volatility		90%
Minimum [Member] | Share-based Payment Arrangement, Employee [Member]
Expected term of options (years)	4 months 24 days
Maximum [Member] | Share-based Payment Arrangement, Employee [Member]
Expected term of options (years)	5 years

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($)						11 Months Ended		12 Months Ended
		Feb. 08, 2021	Nov. 12, 2020	Oct. 07, 2020	Jul. 27, 2020	Dec. 31, 2020		Dec. 31, 2021	Nov. 23, 2021	Nov. 17, 2021	Jul. 16, 2021
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, term								5 years
Class of warrant or right, exercise price of warrants or rights								$ 0.01
Minimum notice period								30 days
Number of trading days determining share price								20 days
Number of days determining share price								30 days
Warrant price								$ 0.10
Gain loss on derivative instruments, net, pretax								$ 4,200,000
Stock Repurchase Program, Authorized Amount										$ 5,000,000
Common stock, par value (in usd per share)						$ 0.0001		$ 0.0001
Stock Repurchased During Period, Value								$ 540,000
Common stock, shares authorized (in shares)						400,000,000		400,000,000
Common stock, shares issued (in shares)						166,125,000		247,758,412
Common stock, shares outstanding (in shares)						166,125,000		247,758,412
Common stock issued, value	[1]					$ 18,476,000
Common stock shares converted								5,022,052
Common stock shares issued for vehicle deliveries								31,000
Vesting of RSUs (in shares)								8,300
Provision of warrants recorded against revenue								$ 200,000
Rights to shares (in shares)								$ 19,300,742
Business Combination [Member]
Class of Warrant or Right [Line Items]
Stock Issued During Period, Shares, New Issues								4,100,000
Business Combination [Member] | Decarbonization Plus Acquisition Corporation [Member]
Class of Warrant or Right [Line Items]
Class of warrant or right, outstanding								275,048
Class of warrant or right, exercise price of warrants or rights								$ 2.20
Stock Issued During Period, Shares, New Issues		326,048
Sale of Stock, Price Per Share		$ 2.20
Common stock shares converted		184,000
Purchase Agreement [Member]
Class of Warrant or Right [Line Items]
Stock Issued During Period, Shares, New Issues			17,720,000
Stock issuance costs				$ 1,000,000
Option Agreement [Member]
Class of Warrant or Right [Line Items]
Stock Issued During Period, Shares, New Issues					3,900,000
Common stock issued, value					$ 3,000,000
Sale of Stock, Price Per Share					$ 2.73
Round A Transaction [Member] | Purchase Agreement [Member]
Class of Warrant or Right [Line Items]
Common stock issued, value				$ 20,000,000
Maximum [Member] | Round A Transaction [Member] | Purchase Agreement [Member]
Class of Warrant or Right [Line Items]
Stock Issued During Period, Shares, New Issues				17,720,000
Private Placements Warrants [Member]
Class of Warrant or Right [Line Items]
Derivative liabilities											$ 19,400,000
Share Price Equals Or Exceeds Ten USD [Member]
Class of Warrant or Right [Line Items]
Share price								10
Share Price Less Than Eighteen USD [Member]
Class of Warrant or Right [Line Items]
Share price								$ 18
Refered To As Thity Day Redemption Period [Member]
Class of Warrant or Right [Line Items]
Minimum notice period								30 days
Common Stock
Class of Warrant or Right [Line Items]
Class of warrants or rights, Number of securities called by each warrant or right								1
Investment company, redemption fee, per share								$ 18
Common Stock | Common Stock Class A
Class of Warrant or Right [Line Items]
Stock Issued During Period, Shares, New Issues						17,277,000	[1]	7,234,006
Common stock issued, value						$ 2,000	[1]	$ 1,000
Vesting of RSUs (in shares)								428,107
Warrant
Class of Warrant or Right [Line Items]
Warrant, exercise price, increase								$ 11.50
Public Warrants [Member]
Class of Warrant or Right [Line Items]
Class of warrant or right, outstanding								11,286,242
Stock Repurchased During Period, Value								$ 500,000
Stock Repurchased During Period, Shares								256,977
Private Placement [Member]
Class of Warrant or Right [Line Items]
Class of warrant or right, outstanding								8,014,500
Hongyun Warrants [Member]
Class of Warrant or Right [Line Items]
Class of warrants or rights, Number of securities called by each warrant or right									2,000,000
Class of warrant or right, exercise price of warrants or rights									$ 7.75
Hongyun Warrants [Member] | Common Stock Class A
Class of Warrant or Right [Line Items]
Common stock, par value (in usd per share)									$ 0.0001
[1]Issuance of common stock, net of issuance costs of $1,024 and conversion of convertible notes have been retroactively restated to give effect to the recapitalization transaction.

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) € / shares in Units, $ / shares in Units, € in Thousands, $ in Thousands		1 Months Ended				3 Months Ended	11 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($)	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 EUR (€) shares	Feb. 28, 2022 USD ($)	Jul. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) vehicle	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2021 USD ($) vehicle $ / shares	Dec. 31, 2022 EUR (€) € / shares	Dec. 31, 2021 EUR (€)
Related Party Transaction [Line Items]
Horizon IP agreement payable								$ 10,000
Related party liability							$ 400	3,700
Compensation cost							500	2,900
Due from related parties current							0	264
Revenue from related party							$ 10,000	$ 19,700
Number of vehicles delivered | vehicle								62
Common stock, par value (in usd per share) | $ / shares							$ 0.0001	$ 0.0001
Contract with customer, asset, purchase					$ 100
Subsequent Event
Related Party Transaction [Line Items]
Number of vehicles delivered | vehicle						20
Revenue from contract with customer						$ 100
Subsequent Event | Hyzon Europe
Related Party Transaction [Line Items]
Common stock, par value (in usd per share) | € / shares									€ 0.01
Consolidation, Less Than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchases Of Interest By Parent, Percentage		49.50%							49.50%
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent, Shares. | shares		1,485,000	1,485,000
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent		$ 5,840	€ 5,520
Payments to Acquire Additional Interest in Subsidiaries		4,760	€ 4,500
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent, Consideration Given, Inventory		$ 1,080							€ 1,020
Joint Venture Agreement [Member]
Related Party Transaction [Line Items]
Due from related parties							$ 200
Related party transaction, Purchases from related party								$ 500
Accounts receivable related parties	$ 1,200							$ 300
Related Party Costs	$ 1,200
Joint Venture Agreement [Member] | Hyzon Europe
Related Party Transaction [Line Items]
Percentage of equity ownership								50.50%		50.50%
Horizon Fuel Cell Technologies And Related Subsidiaries [Member]
Related Party Transaction [Line Items]
Related party transaction, Purchases from related party								$ 200
Horizon Fuel Cell Technologies And Related Subsidiaries [Member] | Research And Development Services [Member]
Related Party Transaction [Line Items]
Related party transaction, research and development expenses								0
Fuel Cell Technologies [Member]
Related Party Transaction [Line Items]
Deposit payment								5,000
Related party transaction, Purchases from related party								7,500
Related Party Transaction Fixed Asset								700
Related Party Transaction Prepayment								300
Horizon IP Agreement [Member]
Related Party Transaction [Line Items]
Related party transaction, amounts of transaction								$ 6,900
Horizon IP Agreement [Member] | Subsequent Event
Related Party Transaction [Line Items]
Related party transaction, amounts of transaction				$ 3,100
Letter of Intend [Member] | Joint Venture Agreement [Member]
Related Party Transaction [Line Items]
Purchase of related party shares								75%
Refundable deposit to related party								$ 1,100		€ 1,000

Loss per Share - Schedule of Ea

Loss per Share - Schedule of Earnings Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Attributable to Parent	$ (14,271)	$ (12,141)
Weighted average shares outstanding:
Basic (in shares)	152,650,000	203,897,000
Effect of dilutive securities		0
Diluted (in shares)	152,650,000	203,897,000
Net loss per share attributable to Hyzon:
Basic (in usd per share)	$ (0.09)	$ (0.06)
Diluted (in usd per share)	$ (0.09)	$ (0.06)

Loss per Share - Schedule of An

Loss per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount		1,853
Stock options and with service conditions
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	14,288,000	12,001,000
Stock options with market and performance conditions [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	5,538,000	5,538,000
Warrant | Private Placement Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	8,015,000
Warrant | Public Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	11,286,000
Earnout shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	23,250,000
Hongyun Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	31,000
Ardour Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	275,000
Former CTO [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	1,772

Leases - Schedule of Supplement

Leases - Schedule of Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Operating leases:
Operating lease right-of-use assets	$ 9,933	$ 943
Operating lease liabilities	(10,062)	(942)
Finance leases:
Finance lease right-of-use assets	332	713
Finance lease liabilities	$ (654)	$ (857)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Operating Lease, Right-of-Use Asset	Operating Lease, Right-of-Use Asset
Weighted average remaining lease term:
Operating leases	7 years 3 months 18 days	4 years 10 months 24 days
Finance leases	1 year 4 months 24 days	2 years 4 months 24 days
Weighted average discount rate:
Operating leases	5.70%	7.10%
Finance leases	7%	6.90%

Leases - Schedule of Components

Leases - Schedule of Components of Lease Cost (Detail) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Operating lease cost	$ 19	$ 862
Variable lease cost	30	205
Finance lease cost:
Amortization of right-of-use assets	172	381
Interest on lease liabilities	35	53
Total lease cost	$ 256	$ 1,501

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	11 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Cash paid for amount included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 19	$ 739
Operating cash flows from finance leases	35	53
Financing cash flows from finance leases	29	203
Right-of-use assets obtained in exchange for new lease liabilities:
Operating leases	780	9,588
Finance leases	$ 886	$ 0

Leases - Schedule of Maturities

Leases - Schedule of Maturities of Lease Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
2022	$ 1,978
2023	1,894
2024	1,806
2025	1,745
2026 and thereafter	4,737
Total minimum lease payments	12,160
Less: imputed interest	(2,098)
Present value of lease obligations	10,062	$ 942
Less: current portion	1,453
Long-term portion of lease obligations	8,609
2022	448
2023	240
2024	0
2024	0
2026 and thereafter	0
Total minimum lease payments	688
Less: imputed interest	(34)
Present value of lease obligations	654	$ 857
Less: current portion	433
Long-term portion of lease obligations	$ 221
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of lease liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Lease liabilities

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Dec. 23, 2022
Hyzon Europe | Hyzon Automotive Technology Company Limited [Member]
Subsequent Event [Line Items]
Ownership interest		100%
HYZNGlobal Nrg H2 Limited
Subsequent Event [Line Items]
Impairment to investment	$ 2.5