10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2022

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File No. 001-38823

HYLIION HOLDINGS CORP.

(Exact Name of Registrant as Specified in Its Charter)

Delaware	83-2538002
(State or Other Jurisdiction of Incorporation)	(IRS Employer Identification No.)
1202 BMC Drive, Suite 100, Cedar Park, TX	78613
(Address of Principal Executive Offices)	(Zip Code)

(833) 495-4466

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x  No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes x  No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐  No x

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading symbol(s)	Name of each exchange on which registered
Common Stock, par value $0.0001 per share	HYLN	The New York Stock Exchange

As of August 1, 2022, 174,031,735 shares of common stock, par value $0.0001 per share, were issued and outstanding.

HYLIION HOLDINGS CORP.

FORM 10-Q FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2022

TABLE OF CONTENTS

INDEX

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)	1
	Condensed Consolidated Balance Sheets	1
	Condensed Consolidated Statements of Operations	2
	Condensed Consolidated Statements of Changes in Stockholders’ Equity	3
	Condensed Consolidated Statements of Cash Flows	4
	Notes to Condensed Consolidated Financial Statements	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	11
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	17
Item 4.	Controls and Procedures	17
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	18
Item 1A.	Risk Factors	18
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	18
Item 3.	Defaults Upon Senior Securities	18
Item 4.	Mine Safety Disclosures	18
Item 5.	Other Information	18
Item 6.	Exhibits	18

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PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

HYLIION HOLDINGS CORP.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Dollar amounts in thousands, except share data)

	June 30, 2022		December 31, 2021
	(Unaudited)
Assets
Current assets
Cash and cash equivalents	$	199,933	$	258,445
Accounts receivable	114		70
Inventory	176		114
Prepaid expenses and other current assets	8,364		9,068
Short-term investments	188,868		118,787
Total current assets	397,455		386,484
Property and equipment, net	2,220		2,235
Operating lease right-of-use assets	7,101		7,734
Intangible assets, net	186		235
Other assets	1,743		1,535
Long-term investments	111,299		180,217
Total assets	$	520,004	$	578,440
Liabilities and stockholders’ equity
Current liabilities
Accounts payable	$	2,705	$	7,455
Current portion of operating lease liabilities	273		21
Accrued expenses and other current liabilities	11,177		7,759
Total current liabilities	14,155		15,235
Operating lease liabilities, net of current portion	7,814		8,623
Other liabilities	1,295		667
Total liabilities	23,264		24,525
Commitments and contingencies (Note 9)
Stockholders’ equity
Common stock, $0.0001 par value; 250,000,000 shares authorized; 173,998,968 and 173,468,979 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	17		17
Additional paid-in capital	378,203		374,795
Retained earnings	118,520		179,103
Total stockholders’ equity	496,740		553,915
Total liabilities and stockholders’ equity	$	520,004	$	578,440

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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HYLIION HOLDINGS CORP.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Dollar amounts in thousands, except share and per share data)

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Revenues
Product sales and other	$	172	$	—	$	512	$	—
Total revenues	172		—		512		—
Cost of revenues
Product sales and other	2,145		—		4,244		—
Total cost of revenues	2,145		—		4,244		—
Gross loss	(1,973)		—		(3,732)		—
Operating expenses
Research and development	(20,057)		(13,389)		(35,865)		(22,721)
Selling, general and administrative	(12,167)		(10,052)		(21,991)		(17,451)
Total operating expenses	(32,224)		(23,441)		(57,856)		(40,172)
Loss from operations	(34,197)		(23,441)		(61,588)		(40,172)
Interest income	855		197		1,140		366
Loss on disposal of assets	(133)		—		(135)		—
Net loss	$	(33,475)	$	(23,244)	$	(60,583)	$	(39,806)
Net loss per share, basic and diluted	$	(0.19)	$	(0.13)	$	(0.35)	$	(0.23)
Weighted-average shares outstanding, basic and diluted	173,897,517		172,260,525		173,741,910		171,260,671

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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HYLIION HOLDINGS CORP.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY

(Dollar amounts in thousands, except share data)

	Six Months Ended June 30, 2022
	Common Stock			Additional Paid-In Capital		Retained Earnings		Total Stockholders’ Equity
	Shares	Amount
Balance at December 31, 2021	173,468,979	$	17	$	374,795	$	179,103	$	553,915
Exercise of common stock options and vesting of restricted stock units, net	336,155	—		(92)		—		(92)
Share-based compensation	—	—		1,563		—		1,563
Net loss	—	—		—		(27,108)		(27,108)
Balance at March 31, 2022	173,805,134	17		376,266		151,995		528,278
Exercise of common stock options and vesting of restricted stock units, net	193,834	—		15		—		15
Share-based compensation	—	—		1,922		—		1,922
Net loss	—	—		—		(33,475)		(33,475)
Balance at June 30, 2022	173,998,968	$	17	$	378,203	$	118,520	$	496,740
	Six Months Ended June 30, 2021
	Common Stock			Additional Paid-In Capital		Retained Earnings		Total Stockholders’ Equity
	Shares	Amount
Balance at December 31, 2020	169,316,421	$	19	$	364,998	$	275,151	$	640,168
Common stock issued for warrants exercised, net of issuance costs	371,535	—		4,282		—		4,282
Exercise of common stock options and vesting of restricted stock units, net	1,831,855	—		287		—		287
Share-based compensation	—	—		1,510		—		1,510
Net loss	—	—		—		(16,562)		(16,562)
Balance at March 31, 2021	171,519,811	19		371,077		258,589		629,685
Exercise of common stock options and vesting of restricted stock units, net	1,278,527	1		215		—		216
Share-based compensation	—	—		1,917		—		1,917
Net loss	—	—		—		(23,244)		(23,244)
Balance at June 30, 2021	172,798,338	$	20	$	373,209	$	235,345	$	608,574

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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HYLIION HOLDINGS CORP.

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Dollar amounts in thousands)

	Six Months Ended June 30,
	2022		2021
Cash flows from operating activities
Net loss	$	(60,583)	$	(39,806)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	554		414
Amortization and accretion of investments	1,043		847
Noncash lease expense	613		518
Inventory write-down	3,313		—
Loss on disposal of assets	135		—
Share-based compensation	3,485		3,427
Changes in operating assets and liabilities:
Accounts receivable	(44)		—
Inventory	(3,375)		—
Prepaid expenses and other assets	595		4,939
Accounts payable	(4,794)		5,940
Accrued expenses and other liabilities	4,024		(182)
Operating lease liabilities	(537)		(256)
Net cash used in operating activities	(55,571)		(24,159)
Cash flows from investing activities
Purchase of property and equipment	(559)		(965)
Payments for security deposit, net	—		(57)
Purchase of investments	(106,797)		(239,021)
Proceeds from sale and maturity of investments	104,492		176,358
Net cash used in investing activities	(2,864)		(63,685)
Cash flows from financing activities
Proceeds from exercise of stock warrants, net of issuance costs	—		16,257
Payments for Paycheck Protection Program loan	—		(908)
Proceeds from exercise of common stock options	54		502
Taxes paid related to net share settlement of equity awards	(131)		—
Net cash (used in) provided by financing activities	(77)		15,851
Net decrease in cash and cash equivalents and restricted cash	(58,512)		(71,993)
Cash and cash equivalents and restricted cash, beginning of period	259,110		389,705
Cash and cash equivalents and restricted cash, end of period	$	200,598	$	317,712
Supplemental disclosure of noncash investing information:
Acquisitions of property and equipment included in accounts payable and other	$	66	$	268

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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Table of Contents

HYLIION HOLDINGS CORP.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Dollar amounts in thousands, except as separately indicated)

Note 1. Overview

Hyliion Holdings Corp. is a Delaware corporation headquartered in Cedar Park, Texas. References to the “Company,” Hyliion," "we," or "us" in this report refer to Hyliion Holdings Corp. and its wholly-owned subsidiary, unless expressly indicated or the context otherwise requires.

The Company designs and develops hybrid and fully electric powertrain systems for Class 8 semi-trucks which modify semi-tractors into hybrid and range-extending electric vehicles, respectively. The Company’s hybrid ("Hybrid") system utilizes intelligent electric drive axles with advanced algorithms and battery technology to optimize vehicle performance, enabling fleets to access an easy, efficient way to decrease fuel expenses, lower emissions and/or improve vehicle performance. The Hypertruck ERXTM system utilizes an intelligent electric powertrain with advanced algorithms to optimize emissions performance and efficiency with no new infrastructure required. The Hypertruck ERX system enables fleets to reduce the cost of ownership while providing the ability to deliver net-negative carbon emissions and operate fully electric when needed. The Company recently launched its commercial Hybrid system, and the Hypertruck ERX system is in the design verification phase.

Note 2. Summary of Significant Accounting Policies

Basis of Presentation

These condensed consolidated statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”), which permit reduced disclosure for interim periods. All intercompany transactions and balances have been eliminated upon consolidation. The condensed consolidated balance sheet at December 31, 2021 was derived from audited financial statements for the fiscal year then ended, but does not include all necessary disclosures required with respect to annual financial statements. In the opinion of the Company, these condensed consolidated financial statements include all recurring adjustments and normal accruals necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the dates and periods presented. These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company’s 2021 Annual Report. Results for interim periods are not necessarily indicative of the results to be expected for a full fiscal year or for any future period.

These condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and settlement of liabilities in the normal course of business. The Company is an early-stage growth company and has generated negative cash flows from operating activities since inception. At June 30, 2022, the Company had total equity of $496.7 million, inclusive of cash and cash equivalents of $199.9 million and investments of $300.2 million. Based on this, the Company has sufficient funds to continue to execute its business strategy for the next twelve months.

Use of Estimates and Uncertainty of the Coronavirus Pandemic

The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the balance sheet date, as well as reported amounts of expenses during the reporting period. The Company’s most significant estimates and judgments involve revenue recognition, inventory, warranties, income taxes and valuation of share-based compensation. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ from those estimates, and such differences could be material to the Company’s financial statements.

On January 30, 2020, the World Health Organization declared the coronavirus outbreak a “Public Health Emergency of International Concern” and on March 11, 2020, declared the coronavirus outbreak a pandemic. In mid-March 2020, U.S. State Governors, local officials and leaders outside of the U.S. began ordering various “shelter-in-place” orders, which have had various impacts on the U.S. and global economies. This has required greater use of estimates and assumptions in the preparation of the condensed consolidated financial statements.

As the coronavirus pandemic continues to evolve, the Company believes the extent of the impact to its businesses, operating results, cash flows, liquidity and financial condition will be primarily driven by the severity and duration of the coronavirus pandemic, the pandemic’s impact on the U.S. and global economies and the timing, scope and effectiveness of federal, state and local governmental responses to the pandemic. Those primary drivers are beyond the Company’s knowledge and control, and as a result, at this time the Company is unable to predict the cumulative impact, both in terms of severity and duration, that the coronavirus pandemic will have on its business, operating results, cash flows and financial condition, but it could be material if the current circumstances continue to exist for a prolonged period. Although the Company has made its best estimates based

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upon current information, actual results could materially differ from the estimates and assumptions. If so, the Company may be subject to future impairment charges as well as changes to recorded reserves and valuations.

Concentration of Supplier Risk

The Company is dependent on certain suppliers, the majority of which are single source suppliers, and the inability of these suppliers to deliver necessary components of the Company’s products in a timely manner at prices, quality levels and volumes that are acceptable, or the Company’s inability to efficiently manage these components from these suppliers, could have a material adverse effect on the Company’s business, prospects, financial condition and operating results.

Cash and Cash Equivalents

The Company considers all highly liquid investments with a maturity date of 90 days or less at the time of purchase to be cash and cash equivalents only if in checking, savings or money market accounts. Cash and cash equivalents include cash held in banks and money market accounts and are carried at cost, which approximates fair value. The Company maintains cash in excess of federally insured limits at financial institutions which it believes are of high credit quality and has not incurred any losses related to these balances to date. The Company believes its credit risk, with respect to these financial institutions to be minimal.

Restricted Cash

The Company has provided its corporate headquarters lessor with a letter of credit for $0.7 million to secure the performance of lease obligations, backed by a restricted cash deposit to pay any draws on the letter of credit by the lessor. Total cash and cash equivalents and restricted cash presented in the condensed consolidated statements of cash flows is summarized as follows:

	June 30, 2022		December 31, 2021		June 30, 2021		December 31, 2020
Cash and cash equivalents	$	199,933	$	258,445	$	317,712	$	389,705
Restricted cash included in other non-current assets	665		665		—		—
	$	200,598	$	259,110	$	317,712	$	389,705

Accounts Receivable

Accounts receivable are stated at gross invoice amount, net of an allowance for doubtful accounts. The allowance for doubtful accounts is maintained at a level considered adequate to provide for potential account losses on the balance based on the Company’s evaluation of the anticipated impact of current economic conditions, changes in the character and size of the balance, past and expected future loss experience and other pertinent factors. At June 30, 2022 and December 31, 2021, accounts receivable included amounts receivable from customers of $0.1 million and $45.0 thousand, respectively. At June 30, 2022 and December 31, 2021, there was no allowance for doubtful accounts required based on the Company's evaluation.

Investments

The Company’s investments consist of corporate bonds, U.S. treasury and agency securities, state and local municipal bonds and commercial paper, all of which are classified as held-to-maturity, with a maturity date of 36-months or less at the time of purchase. The Company determines the appropriate classification of investments at the time of purchase and re-evaluates such designation as of each balance sheet date. Investments are classified as held-to-maturity when the Company has the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity. Such amortization, along with interest, is included in interest income. The Company uses the specific identification method to determine the cost basis of securities sold.

Investments are impaired when a decline in fair value is judged to be other-than-temporary. The Company evaluates investments for impairment by considering the length of time and extent to which market value has been less than cost or amortized cost, the financial condition and near-term prospects of the issuer as well as specific events or circumstances that may influence the operations of the issuer and the Company’s intent to sell the security or the likelihood that it will be required to sell the security before recovery of the entire amortized cost. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded to other income and a new cost basis in the investment is established.

Fair Value Measurements

ASC 820, Fair Value Measurements, clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based upon assumptions that market participants would use in pricing an asset or

6

liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level I: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the Company can access at the measurement date;

Level II: Significant other observable inputs other than level I prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data; and

Level III: Significant unobservable inputs that reflect the Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

An asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used maximize the use of observable inputs and minimize the use of unobservable inputs.

The Company believes its valuation methods are appropriate and consistent with other market participants, however the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The Company’s financial instruments consist of cash and cash equivalents and restricted cash, accounts receivable, investments, accounts payable and accrued expenses for which the carrying value approximates fair value, exclusive of any interim unrealized gains or losses, because of the short-term nature of the instruments. The fair value of investments are based on quoted prices for identical or similar instruments in markets that are not active. As a result, investments are classified within Level II of the fair value hierarchy.

Revenue

The Company follows five steps to recognize revenue from contracts with customers under ASC 606, Revenue from Contracts with Customers, which are:

Step 1: Identify the contract(s) with a customer;

Step 2: Identify the performance obligations in the contract;

Step 3: Determine the transaction price;

Step 4: Allocate the transaction price to the performance obligations in the contract; and

Step 5: Recognize revenue when (or as) a performance obligation is satisfied.

Revenue is comprised of sales of Hybrid systems for Class 8 semi-trucks and specific other features and services that meet the definition of a performance obligation, including internet connectivity and data processing. We provide installation services for the Hybrid system onto the customers’ vehicle. The Company’s products are marketed and sold to end-user fleet customers in North America. When our contracts with customers contain multiple performance obligations and where material, the contract transaction price is allocated on a relative standalone selling price basis to each performance obligation. There is no meaningful basis on which to disaggregate revenue in the current period.

We recognize revenue on Hybrid system sales upon delivery and acceptance of the vehicle to the customer, which is when control transfers. Contracts are reviewed for significant financing components and payments are typically received within 30 days of delivery. The sale of a Hybrid system to an end-use fleet customer consists of a completed modification to the customer vehicle and the installation services involve significant integration of the Hybrid system with the customer’s vehicle. Installation services are not distinct within the context of the contract and together with the sale of the Hybrid system represent a single performance obligation. We do not offer any sales returns. Amounts billed to customers related to shipping and handling are classified as revenue, and we have elected to recognize the cost for freight and shipping when control has transferred to the customer as a cost of revenue. Our policy is to exclude taxes collected from customers from the transaction price of contracts. In the fourth quarter of fiscal 2021, we began taking deposits to secure future Hypertruck ERX production slots.

Warranties

We provide limited assurance-type warranties under our contracts and do not offer extended warranties or maintenance contracts. The warranty period typically extends for the lesser of two years or 200,000 miles following transfer of control and

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solely relate to correction of product defects during the warranty period. We recognize the cost of the warranty upon transfer of control based on estimated and historical claims rates and fulfillment costs, which are variable. Should product failure rates and fulfillment costs differ from these estimates, material revisions to the estimated warranty liability would be required. Warranty expense is recorded as a component of cost of revenue.

Note 3. Investments

The amortized cost, unrealized gains and losses, fair value and maturities of our held-to-maturity investments at June 30, 2022 and December 31, 2021 are summarized as follows:

			Fair Value Measurements at June 30, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Commercial paper	$	62,127	$	—	$	(313)	$	61,814
U.S. government agency bonds	4,450		—		(222)		4,228
State and municipal bonds	27,962		—		(570)		27,392
Corporate bonds and notes	205,628		—		(3,672)		201,956
	$	300,167	$	—	$	(4,777)	$	295,390

			Fair Value Measurements at December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Commercial paper	$	73,908	$	2	$	(31)	$	73,879
U.S. government agency bonds	4,450		—		(7)		4,443
State and municipal bonds	17,797		—		(115)		17,682
Corporate bonds and notes	202,849		3		(953)		201,899
	$	299,004	$	5	$	(1,106)	$	297,903

	June 30, 2022				December 31, 2021
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in one year or less	$	188,868	$	187,223	$	118,787	$	118,714
Due after one year through five years	111,299		108,167		180,217		179,189
	$	300,167	$	295,390	$	299,004	$	297,903

Note 4. Fair Value Measurements

The fair value measurements of our financial assets at June 30, 2022 and December 31, 2021 are summarized as follows:

	Fair Value Measurements at June 30, 2022
	Level I		Level II		Level III		Total
Cash and cash equivalents	$	199,933	$	—	$	—	$	199,933
Restricted cash	665		—		—		665
Held-to-maturity investments:
Commercial paper	—		61,814		—		61,814
U.S. government agency bonds	—		4,228		—		4,228
State and municipal bonds	—		27,392		—		27,392
Corporate bonds and notes	—		201,956		—		201,956
	$	200,598	$	295,390	$	—	$	495,988

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	Fair Value Measurements at December 31, 2021
	Level I		Level II		Level III		Total
Cash and cash equivalents	$	258,445	$	—	$	—	$	258,445
Restricted cash	665		—		—		665
Held-to-maturity investments:
Commercial paper	—		73,879		—		73,879
U.S. government agency bonds	—		4,443		—		4,443
State and municipal bonds	—		17,682		—		17,682
Corporate bonds and notes	—		201,899		—		201,899
	$	259,110	$	297,903	$	—	$	557,013

Note 5. Inventory

The carrying value of our inventory at June 30, 2022 and December 31, 2021 is summarized as follows:

	June 30, 2022		December 31, 2021
Raw materials	$	—	$	—
Work in process	9		4
Finished goods	167		110
	$	176	$	114

During the three and six months ended June 30, 2022, we recorded inventory write-downs of $2.0 million and $3.3 million, respectively. During the three and six months ended June 30, 2021, we recorded no inventory write-downs. These write-downs are included in cost of revenues.

Note 6. Share-Based Compensation

During the six months ended June 30, 2022 and 2021, the Company granted 2.1 million and 3.3 million, respectively, restricted stock units which will vest over a period of one to four years, some of which include performance criteria based on the achievement of key Company milestones. During the six months ended June 30, 2022 and 2021, 0.5 million and 0.3 million, respectively, restricted stock units and options were forfeited. Share-based compensation expense for the three and six months ended June 30, 2022 was $1.9 million and $3.5 million, respectively. Share-based compensation expense for the three and six months ended June 30, 2021 was $1.9 million and $3.4 million, respectively.

Note 7. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities at June 30, 2022 and December 31, 2021 are summarized as follows:

	June 30, 2022		December 31, 2021
Accrued professional services and other	$	7,259	$	3,681
Accrued compensation and related benefits	3,246		3,460
Other accrued liabilities	672		618
	$	11,177	$	7,759

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Note 8. Warranties

The change in warranty liability for the three and six months ended June 30, 2022 and 2021 is summarized as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Balance at beginning of period	$	238	$	—	$	44	$	—
Provision for new warranties	124		—		331		—
Net changes in accrual related to pre-existing warranties	9		—		—		—
Warranty costs incurred	(23)		—		(27)		—
Balance at end of period	$	348	$	—	$	348	$	—

Note 9. Commitments and Contingencies

Legal Proceedings

The Company is periodically involved in legal proceedings, legal actions and claims arising in the normal course of business, including proceedings relating to product liability, intellectual property, safety and health, employment and other matters. The Company believes that the outcome of such legal proceedings, legal actions and claims will not have a significant adverse effect on the Company’s financial position, results of operations or cash flows.

Note 10. Net Loss Per Share

The computation of basic and diluted net loss per share for the three and six months ended June 30, 2022 and 2021 is summarized as follows (in thousands, except share and per share data):

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Numerator:
Net loss attributable to common stockholders	$	(33,475)	$	(23,244)	$	(60,583)	$	(39,806)
Denominator:
Weighted average shares outstanding, basic and diluted	173,897,517		172,260,525		173,741,910		171,260,671
Net loss per share, basic and diluted	$	(0.19)	$	(0.13)	$	(0.35)	$	(0.23)

Potential common shares excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect for the three and six months ended June 30, 2022 and 2021 are summarized as follows:

	Three and Six Months Ended June 30,
	2022	2021
Unexercised stock options	2,761,006	3,852,897
Unvested restricted stock units*	4,154,423	3,194,865
	6,915,429	7,047,762

* Potential common shares from unvested restricted stock units for the periods ended June 30, 2022 and 2021 include 1,361,667 and 1,743,750 shares, respectively, where no accounting grant date has been established.

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ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

References to the “Company,” "Hyliion," "we," or "us" in this report refer to Hyliion Holdings Corp. and its wholly-owned subsidiary, unless expressly indicated or the context otherwise requires. The following discussion should be read in conjunction with our unaudited condensed consolidated financial statements and related notes thereto included elsewhere in this report and our audited consolidated financial statements and related notes thereto in our 2021 Annual Report.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q includes forward-looking statements within the meaning of Section 27A of the Securities Act, and Section 21E of the Exchange Act. Our forward-looking statements include, but are not limited to, statements regarding our or our management team’s expectations, hopes, beliefs, intentions, or strategies regarding the future. In addition, any statements that refer to projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, are forward-looking statements. The words “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “might,” “plan,” “possible,” “potential,” “predict,” “project,” “should,” “would” and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking.

The forward-looking statements contained in this report are based on our current expectations and beliefs concerning future developments and their potential effects on us. There can be no assurance that future developments affecting us will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control), or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. Factors that might cause or contribute to such a discrepancy include, but are not limited to, our status as an early stage company with a history of losses, and our expectation of incurring significant expenses and continuing losses for the foreseeable future; our ability to develop key commercial relationships with suppliers and customers; our ability to retain the services of Thomas Healy, our Chief Executive Officer; our ability to disrupt the powertrain market; the effects of our dynamic and proprietary solutions on commercial truck customers; our ability to incorporate existing and new technologies into products; the ability to accelerate the commercialization of the Hypertruck ERXTM; our ability to meet 2022 and future product milestones; the impact of an inflationary environment and COVID-19 on long-term objectives; the ability of our solutions to reduce carbon intensity and greenhouse gas emissions, and the other risks and uncertainties described under the heading “Risk Factors” in our other SEC filings including in our 2021 Annual Report (See Item 1A. Risk Factors). Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required under applicable securities laws.

Overview

Our mission is to be the leading provider of electrified powertrain solutions for the commercial vehicle industry. Our goal is to reduce the carbon intensity and the Greenhouse Gas ("GHG") emissions of the transportation sector by providing hybrid and range-extending electric powertrain solutions for Class 8 semi-trucks at the lowest total cost of ownership ("TCO"). Throughout our product offerings, we utilize our battery systems, control software and data analytics, combined with fully integrated electric motors and power electronics, to produce electrified powertrain systems.

We currently offer two different product lines: a Hybrid system which is designed as an add-on to electric powertrains on trucks which can augment power needs or potentially save on fuel costs, and the Hypertruck ERX which is a complete powertrain option that is fully electric and leverages an onboard generator to recharge the batteries as the vehicle is in operation. By reducing both GHG emissions and TCO, our environmentally conscious solutions support our customers’ pursuit of their sustainability and financial objectives.

We are currently selling the Hybrid system and are developing our Hypertruck ERX electrified powertrain system for Class 8 semi-trucks. Our Hybrid systems have been installed in low volumes on our initial customers’ commercial vehicles. Across these customer installations and over the entire Hyliion fleet, we have accumulated millions of real-world road miles on Class 8 semi-trucks. Our Hybrid system can either be installed on a new vehicle prior to entering fleet service or retrofit to an existing in-service vehicle. The Hypertruck ERX system leverages the experience and operating data from our Hybrid systems to offer a solution to replace the traditional diesel or Compressed Natural Gas ("CNG") powertrain installed in new vehicles.

The Hypertruck ERX powertrain, which is a range-extending electric vehicle, is addressing the market needs of having a fully electric drive truck that can travel long distance between refuels and can leverage existing natural gas infrastructure. Our initial expected deliveries of our Hypertruck ERX systems to customers are designed to have their batteries recharged by an onboard CNG generator. Our Hypertruck ERX system can offer commercial vehicle owners and operators a net carbon negative capable electrified powertrain option, when using Renewable Natural Gas (“RNG”). We believe CNG/RNG is the correct fuel source to

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begin with, but there are other fuels that will become available to address the climate change initiative, including hydrogen. We have showcased a multistage roadmap that starts with utilizing a CNG/RNG generator and evolves into offering hydrogen-based solutions as well. The Hypertruck platform will be designed to be fuel agnostic while the rest of the electric powertrain can remain the same. We plan to initially release the Hypertruck ERX CNG solution, following with the release of a Fuel Agnostic generator and a Hydrogen Fuel Cell generator for the Hypertruck platform in the future.

CNG fueled battery recharging is preferable today due to both the current comparable cost of fuels and existing availability of CNG infrastructure. Class 8 semi-trucks can currently be refueled with CNG through existing, geographically diverse and third-party accessible natural gas refueling stations established across North America. Globally, RNG, CNG and liquified natural gas (“LNG”) are used widely for land-based transport and trucking and we believe there are established, geographically diverse and third-party accessible stations available in certain areas that may be leveraged in connection with the use of our electrified powertrain solutions in the future. We believe there is opportunity for adoption of our electrified powertrain solutions across Europe and other countries around the globe. This existing and accessible infrastructure will significantly reduce the buildout time and cost required to utilize our Hypertruck ERX system as compared to other proposed potential electrified solutions.

Our Hybrid and Hypertruck ERX systems are designed to be able to be installed on most major Class 8 semi-trucks in the long term, which will give our customers the flexibility to continue using their preferred vehicle brands and maintain their existing fleet maintenance and operations strategies. Our early Hybrid system deployments include leaders in the transportation and logistics sector. We are focusing our initial marketing efforts on large fleet operators as well as companies committed to reducing the overall environmental impact and fuel costs of their owned and operated trucking fleets.

Key Factors Affecting Operating Results

We believe that our performance and future success depend on several factors that present significant opportunities for us but also pose risks and challenges, including but not limited to those discussed below and referenced in Item 1A “Risk Factors.”

Successful Commercialization of Our Drivetrain Solutions

Our Hybrid system officially launched, and our first Hypertruck ERX showcase unit was unveiled on August 31, 2021 at the ACT Expo in Long Beach, California. Compared to previous Hyliion systems, the Hybrid system offers fleets a lighter solution that is easier to install, service and operate. The Hybrid system draws upon the real-world feedback we have received from customers and the millions of miles logged with the previous system. Due to shortages of various components caused by global supply chain disruptions, we are experiencing longer delivery times for a portion of the orders we have received on new Hybrid systems. In addition, we continually assess the potential demand impact for the Hybrid system offering in light of recent changes within the competitive landscape.

We began our Hypertruck ERX roadshow in November 2021 which consists of numerous technology fleet experiences focused on demonstrating the features and benefits of the electric powertrain firsthand. The roadshow consists of Ride and Drive events and in-depth product education of the Hypertruck ERX’s features and benefits, including how it enables fleets’ decarbonization goals while also reducing total cost of ownership. Our development timeline has been extended to allow for design verification and testing inclusive of critical summer and winter seasons, as well as the accumulation of up to one million miles prior to production. We expect to complete design verification and begin initial controlled fleet trials by the end of 2022.

There have been ongoing shortages in the automotive industry supply chain including semiconductors as well as several other key components. These supply chain challenges have been especially prominent in the trucking industry, and one of the impacts has been significantly extended lead times for ordering new trucks. Fleets are experiencing lead times on new truck purchases that extend out for delivery into 2023. We placed orders with Peterbilt for all chassis needed in 2022 earlier this year and are working to secure build slots for the 2023 calendar year in an effort to mitigate future potential supply chain impacts to our Hypertruck ERX development schedule. We continue to work closely with our current supply base to improve delivery of components for the quarters ahead and are diligently seeking alternative sources of supply for components that meet our technical specifications with shorter lead times.

We anticipate that a substantial portion of our capital resources and efforts in the near future will be focused on the continued development and commercialization of our drivetrain solutions. The amount and timing of our future funding requirements, if any, will depend on many factors, including the pace and results of our research and development efforts, as well as factors that are outside of our control.

Customer Demand

We have deployed demonstration Hybrid systems to certain early adopters who we expect to become customers in the future, including leaders in the transportation and logistics sector as well as companies committed to reducing the overall environmental impact and fuel costs of their owned and operated trucking fleets. Further, we began selling the Hybrid system in the fourth quarter of 2021.

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In 2021, we announced our Hypertruck Innovation Council, which consists of some of the largest fleets who will be assisting us along the development journey and will have been among the first to experience the Hypertruck ERX through our Ride and Drive events. The successful launch program and deployment of the Hypertruck ERX met with positive feedback from customer operations teams and drivers and generated further interest in the Hypertruck ERX solution and longer-term commercial relationships with us.

Key Components of Statements of Operations

Revenue

We currently generate revenues from sales of Hybrid systems for Class 8 semi-trucks.

Cost of Revenue

Cost of revenue includes all direct costs such as labor and materials, overhead costs, warranty costs and any write-down of inventory to net realizable value.

Research and Development Expense

Research and development expenses consist primarily of costs incurred for the discovery and development of our electrified powertrain solutions, which include:

•personnel-related expenses including salaries, benefits, travel and share-based compensation, for personnel performing research and development activities;

•fees paid to third parties such as consultants and contractors for outsourced engineering services;

•expenses related to materials, supplies and third-party services;

•depreciation for equipment used in research and development activities; and

•allocation of general overhead costs.

We expect to continue to invest in research and development activities to achieve operational and commercial goals.

Selling, General and Administrative Expense

Selling, general and administrative expenses consist of personnel-related expenses for our corporate, executive, finance, sales, marketing and other administrative functions, expenses for outside professional services, including legal, audit and accounting services, as well as expenses for facilities, depreciation, amortization, travel, sales and marketing costs. Personnel-related expenses consist of salaries, benefits and share-based compensation.

We expect our selling, general and administrative expenses to increase for the foreseeable future as we scale headcount with the growth of our business, and as a result of operating as a public company, including compliance with the rules and regulations of the U.S. Securities and Exchange Commission, legal, audit, additional insurance expenses, investor relations activities and other administrative and professional services.

Other Income

Other income currently consists primarily of interest income earned on our investments.

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Results of Operations

Comparison of Three Months Ended June 30, 2022 to Three Months Ended June 30, 2021

Our results of operations for the three months ended June 30, 2022 (the "current quarter") and 2021 on a consolidated basis are summarized as follows (in thousands, except share and per share data):

	Three Months Ended June 30,
	2022		2021		$ Change		% Change
Revenues
Product sales and other	$	172	$	—	$	172	N/A
Total revenues	172		—		172		N/A
Cost of revenues
Product sales and other	2,145		—		2,145		N/A
Total cost of revenues	2,145		—		2,145		N/A
Gross loss	(1,973)		—		(1,973)		N/A
Operating expenses
Research and development	(20,057)		(13,389)		(6,668)		49.8	%
Selling, general and administrative expenses	(12,167)		(10,052)		(2,115)		21.0	%
Total operating expenses	(32,224)		(23,441)		(8,783)		37.5	%
Loss from operations	(34,197)		(23,441)		(10,756)		45.9	%
Interest income	855		197		658		334.0	%
Loss on disposal of assets	(133)		—		(133)		N/A
Net loss	$	(33,475)	$	(23,244)	$	(10,231)	44.0	%
Net loss per share, basic and diluted	$	(0.19)	$	(0.13)	$	(0.06)	46.2	%
Weighted-average shares outstanding, basic and diluted	173,897,517		172,260,525		1,637		1.0	%

Revenue

Sales increased $0.2 million in the current quarter, driven by sales of Hybrid systems.

Cost of Revenues

Cost of revenues increased $2.1 million in the current quarter, driven by sales of Hybrid systems. We expect a difference in timing between recognition of revenues and cost of revenues due to write-down of inventory to net realizable value in periods prior to sales. The increase in cost of revenues includes:

•Inventory write-downs of $2.0 million attributable to inventory on hand that had a cost higher than its net realizable value; and

•Warranty costs of $0.1 million for estimated costs to administer and maintain the warranty program for labor, transportation and parts, excluding any contribution from vendors.

Research and Development

Research and development expenses increased $6.7 million in the current quarter primarily due to an increase of $6.3 million for the design and testing of our Hypertruck system including an increase in personnel and benefits as we build out our engineering, operations and supply chain teams and associated capabilities.

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Selling, General and Administrative

Selling, general, and administrative expenses increased $2.1 million in the current quarter primarily due to:

•An increase in personnel and benefits of $0.5 million and software costs of $0.6 million as we continue to grow our sales and other functions; and

•An increase of $0.7 million for legal and professional services and other.

Other Income

Total other income increased $0.5 million in the current quarter primarily due to interest income on investments.

Comparison of Six Months Ended June 30, 2022 to Six Months Ended June 30, 2021

The following table summarizes our results of operations on a consolidated basis for the six months ended June 30, 2022 (the "current six months") and 2021 (in thousands, except share and per share data):

	Six Months Ended June 30,
	2022		2021		$ Change		% Change
Revenues
Product sales and other	$	512	$	—	$	512	N/A
Total revenues	512		—		512		N/A
Cost of revenues
Product sales and other	4,244		—		4,244		N/A
Total cost of revenues	4,244		—		4,244		N/A
Gross loss	(3,732)		—		(3,732)		N/A
Operating expenses
Research and development	(35,865)		(22,721)		(13,144)		57.8	%
Selling, general and administrative expenses	(21,991)		(17,451)		(4,540)		26.0	%
Total operating expenses	(57,856)		(40,172)		(17,684)		44.0	%
Loss from operations	(61,588)		(40,172)		(21,416)		53.3	%
Interest income	1,140		366		774		211.5	%
Loss on disposal of assets	(135)		—		(135)		N/A
Net loss	$	(60,583)	$	(39,806)	$	(20,777)	52.2	%
Net loss per share, basic and diluted	$	(0.35)	$	(0.23)	$	(0.12)	52.2	%
Weighted-average shares outstanding, basic and diluted	173,741,910		171,260,671		2,481		1.4	%

Revenue

Sales increased $0.5 million in the current six months, driven by sales of Hybrid systems.

Cost of Revenues

Cost of revenues increased $4.2 million in the current six months, driven by sales of Hybrid systems. We expect a difference in timing between recognition of revenues and cost of revenues due to write-down of inventory to net realizable value in periods prior to sales. The increase in cost of revenues includes:

•Inventory write-downs of $3.3 million attributable to inventory on hand that had a cost higher than its net realizable value; and

•Warranty costs of $0.3 million for estimated costs to administer and maintain the warranty program for labor, transportation and parts, excluding any contribution from vendors.

Research and Development

Research and development expenses increased $13.1 million in the current six months primarily due to an increase of $12.4 million for the design and testing of our Hypertruck system including an increase in personnel and benefits as we build out our engineering, operations and supply chain teams and associated capabilities.

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Selling, General and Administrative

Selling, general, and administrative expenses increased $4.5 million in the current six months primarily due to:

•An increase in personnel and benefits of $2.0 million and software costs of $1.3 million as we continue to grow our sales and other functions; and

•An increase of $1.6 million for legal and professional services and other.

Other Income

Total other income increased $0.6 million in the current six months primarily due to interest income on investments.

Liquidity and Capital Resources

At June 30, 2022, our current assets were $397.5 million, consisting primarily of cash and cash equivalents of $199.9 million, short-term investments of $188.9 million and prepaid expenses of $8.4 million. Our current liabilities were $14.2 million primarily comprised of accounts payable, accrued expenses and operating lease liabilities.

We believe the credit quality and liquidity of our investment portfolio at June 30, 2022 is strong and will provide sufficient liquidity to satisfy operating requirements, working capital purposes and strategic initiatives. The unrealized gains and losses of the portfolio may remain volatile as changes in the general interest environment and supply and demand fluctuations of the securities within our portfolio impact daily market valuations. To mitigate the risk associated with this market volatility, we deploy a relatively conservative investment strategy focused on capital preservation and liquidity whereby no investment security may have a final maturity of more than 36 months from the date of acquisition or a weighted average maturity exceeding 18 months. Eligible investments under the Company’s investment policy bearing a minimum credit rating of A1, A-1, F1 or higher for short-term investments and A2, A, or higher for longer-term investments include money market funds, commercial paper, certificates of deposit, and municipal securities. Additionally, all of our debt securities are classified as held-to-maturity as we have the intent and ability to hold these investment securities to maturity, which minimizes any realized losses that we would recognize prior to maturity. However, even with this approach we may incur investment losses as a result of unusual or unpredictable market developments, and we may experience reduced investment earnings if the yields on investments deemed to be low risk remain low or decline further due to unpredictable market developments. In addition, these unusual and unpredictable market developments may also create liquidity challenges for certain of the assets in our investment portfolio.

Based on our past performance, we believe our current assets will be sufficient to continue and execute on our business strategy and meet our capital requirements for the next twelve months. Our primary short-term cash needs are Hypertruck ERX product development costs, operating expenses and production and related costs of Hybrid systems. We expect to continue to incur net losses in the short term, as we continue to execute on our strategic initiatives by (i) completing the development and commercialization of the electrified drive systems for Class 8 semi-trucks, (ii) scaling the Company’s operations to meet anticipated demand and (iii) hiring of personnel. However, actual results could vary materially and negatively as a result of a number of factors including, but not limited to, those discussed in Part II, Item 1A. "Risk Factors."

During the periods presented, we did not have any relationships with unconsolidated organizations or financial partnerships, such as structured finance or special purpose entities, which were established for the purpose of facilitating off-balance sheet arrangements.

Cash Flows

Net cash, cash equivalents and restricted cash provided by or used in operating activities, investing activities and financing activities for the six months ended June 30, 2022 and 2021 is summarized as follows (in thousands):

	Six Months Ended June 30,
	2022		2021
Cash from operating activities	$	(55,571)	$	(24,159)
Cash from investing activities	(2,864)		(63,685)
Cash from financing activities	(77)		15,851
	$	(58,512)	$	(71,993)

Cash from Operating Activities

For the six months ended June 30, 2022, cash flows used in operating activities were $55.6 million. Cash used primarily related to a net loss of $60.6 million, adjusted for changes in working capital accounts and certain non-cash expenses of $5.0 million (including $3.5 million related to share-based compensation and $2.2 million related to depreciation, amortization and accretion charges, partially offset by $0.8 million related to accounts payable, accrued expenses and other liabilities).

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For the six months ended June 30, 2021, cash flows used in operating activities were $24.2 million. Cash used primarily related to net loss of $39.8 million, adjusted for changes in working capital accounts and certain non-cash expenses of $15.6 million (including $3.4 million related to share-based compensation, $1.8 million related to depreciation, amortization and accretion charges, $5.8 million related to accounts payable, accrued expenses and other liabilities and $4.9 million related to prepaid expenses and other assets).

Cash from Investing Activities

For the six months ended June 30, 2022, cash flows used in investing activities were $2.9 million. Cash used related to the purchase of investments of $106.8 million and property and equipment of $0.6 million, offset by the sale or maturity of investments of $104.5 million.

For the six months ended June 30, 2021, cash flows used in investing activities were $63.7 million. Cash used primarily related to the purchase of investments of $239.0 million and property and equipment of $1.0 million, partially offset by the sale or maturity of investments of $176.4 million.

Net cash used in investing activities is expected to increase as we purchase additional property and equipment and continue development of our Hypertruck ERX systems and scale manufacturing operations to meet anticipated demand.

Cash from Financing Activities

For the six months ended June 30, 2022, cash flows used in financing activities were $0.1 million. Cash flows were primarily due to payment of taxes related to net share settlement of equity awards of $0.1 million.

For the six months ended June 30, 2021, cash flows provided by financing activities were $15.9 million. Cash flows were primarily due to net proceeds from the exercise of warrants of $16.3 million, partially offset by repayments of $0.9 million for a Paycheck Protection Program loan.

Critical Accounting Policies and Estimates

In preparing our condensed consolidated financial statements, we applied the same critical accounting policies as described in our 2021 Annual Report that affect judgments and estimates of amounts recorded for certain assets, liabilities, revenues and expenses.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

A description of the market risks associated with our business is contained in the “Quantitative and Qualitative Disclosures About Market Risk” section of our 2021 Annual Report. There have been no material changes to our market risks as therein previously reported.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Based on our management’s evaluation (with the participation of our Principal Executive Officer and Principal Financial Officer) of the effectiveness of our disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, our Principal Executive Officer and Principal Financial Officer have concluded that, at June 30, 2022, our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and to provide reasonable assurance that such information is accumulated and communicated to our management, including our Principal Executive Officer and Principal Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the quarter ended June 30, 2022 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

From time to time in the ordinary course of business, the Company may be named as a defendant in legal proceedings related to various issues, including workers’ compensation claims, tort claims, or contractual disputes. We are not currently involved in any material legal proceedings.

ITEM 1A. RISK FACTORS

A description of the risk factors associated with our business is contained in the “Risk Factors” section of our 2021 Annual Report. There have been no material changes to our Risk Factors as therein previously reported.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

Exhibit Number	Description
31.1*	Certification of Principal Executive Officer pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Principal Financial Officer pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**	Certification of Principal Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2**	Certification of Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibits 101)

*    Filed herewith.

**    Furnished herewith.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date: August 9, 2022	HYLIION HOLDINGS CORP.
	/s/ Thomas Healy
	Name:	Thomas Healy
	Title:	President and Chief Executive Officer (Principal Executive Officer)
	/s/ Sherri Baker
	Name:	Sherri Baker
	Title:	Chief Financial Officer (Principal Financial Officer)

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EX-31.1

EXHIBIT 31.1

CERTIFICATIONS

I, Thomas Healy, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Hyliion Holdings Corp.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 9, 2022	By:	/s/ Thomas Healy
		Thomas Healy
		President and Chief Executive Officer (Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATIONS

I, Sherri Baker, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Hyliion Holdings Corp.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 9, 2022	By:	/s/ Sherri Baker
		Sherri Baker
		Chief Financial Officer (Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Quarterly Report of Hyliion Holdings Corp. (the “Company”) on Form 10-Q for the period ended June 30, 2022, as filed with the Securities and Exchange Commission on or about the date hereof (the “Report”), I, Thomas Healy, President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of, and for, the periods presented in this Report.

Date: August 9, 2022	By:	/s/ Thomas Healy
	Name:	Thomas Healy
	Title:	President and Chief Executive Officer (Principal Executive Officer)

The foregoing certification is being furnished solely to accompany the report pursuant to 18 U.S.C. Section 1350, and is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

In connection with the Quarterly Report of Hyliion Holdings Corp. (the “Company”) on Form 10-Q for the period ended June 30, 2022, as filed with the Securities and Exchange Commission on or about the date hereof (the “Report”), I, Sherri Baker, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company as of, and for, the periods presented in this Report.

Date: August 9, 2022	By:	/s/ Sherri Baker
	Name:	Sherri Baker
	Title:	Chief Financial Officer (Principal Financial Officer)

The foregoing certification is being furnished solely to accompany the report pursuant to 18 U.S.C. Section 1350, and is not being filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and is not to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

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Cover - shares	6 Months Ended
	Jun. 30, 2022	Aug. 01, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-38823
Entity Registrant Name	HYLIION HOLDINGS CORP.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	83-2538002
Entity Address, Address Line One	1202 BMC Drive, Suite 100
Entity Address, City or Town	Cedar Park
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78613
City Area Code	(833)
Local Phone Number	495-4466
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	HYLN
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		174,031,735
Entity Central Index Key	0001759631
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 199,933	$ 258,445
Accounts receivable	114	70
Inventory	176	114
Prepaid expenses and other current assets	8,364	9,068
Short-term investments	188,868	118,787
Total current assets	397,455	386,484
Property and equipment, net	2,220	2,235
Operating lease right-of-use assets	7,101	7,734
Intangible assets, net	186	235
Other assets	1,743	1,535
Long-term investments	111,299	180,217
Total assets	520,004	578,440
Current liabilities
Accounts payable	2,705	7,455
Current portion of operating lease liabilities	273	21
Accrued expenses and other current liabilities	11,177	7,759
Total current liabilities	14,155	15,235
Operating lease liabilities, net of current portion	7,814	8,623
Other liabilities	1,295	667
Total liabilities	23,264	24,525
Commitments and contingencies
Stockholders’ equity
Common stock, $0.0001 par value; 250,000,000 shares authorized; 173,998,968 and 173,468,979 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	17	17
Additional paid-in capital	378,203	374,795
Retained earnings	118,520	179,103
Total stockholders’ equity	496,740	553,915
Total liabilities and stockholders’ equity	$ 520,004	$ 578,440

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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Common stock, par value (in USD per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	250,000,000	250,000,000
Common stock, shares issued (in shares)	173,998,968	173,468,979
Common stock, shares outstanding (in shares)	173,998,968	173,468,979

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Unaudited Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 172	$ 0	$ 512	$ 0
Cost of revenues	2,145	0	4,244	0
Gross loss	(1,973)	0	(3,732)	0
Research and development	(20,057)	(13,389)	(35,865)	(22,721)
Selling, general and administrative	(12,167)	(10,052)	(21,991)	(17,451)
Total operating expenses	(32,224)	(23,441)	(57,856)	(40,172)
Loss from operations	(34,197)	(23,441)	(61,588)	(40,172)
Interest income	855	197	1,140	366
Loss on disposal of assets	(133)	0	(135)	0
Net loss	$ (33,475)	$ (23,244)	$ (60,583)	$ (39,806)
Net loss per share, basic (in USD per share)	$ (0.19)	$ (0.13)	$ (0.35)	$ (0.23)
Net loss per share, diluted (in USD per share)	$ (0.19)	$ (0.13)	$ (0.35)	$ (0.23)
Weighted-average shares outstanding, basic (in shares)	173,897,517	172,260,525	173,741,910	171,260,671
Weighted-average shares outstanding, diluted (in shares)	173,897,517	172,260,525	173,741,910	171,260,671
Product sales and other
Revenues	$ 172	$ 0	$ 512	$ 0
Cost of revenues	$ 2,145	$ 0	$ 4,244	$ 0

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Unaudited Condensed Consolidated Statements of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings
Balance at beginning (in shares) at Dec. 31, 2020		169,316,421
Balance at beginning at Dec. 31, 2020	$ 640,168	$ 19	$ 364,998	$ 275,151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and vesting of restricted stock units, net (shares)		1,831,855
Exercise of common stock options and vesting of restricted stock units, net	287		287
Common stock issued for warrants exercised, net of issuance cost (in Shares)		371,535
Common stock issued for warrants exercised, net of issuance costs	4,282		4,282
Share-based compensation	1,510		1,510
Net loss	(16,562)			(16,562)
Balance at ending (in shares) at Mar. 31, 2021		171,519,811
Balance at ending at Mar. 31, 2021	629,685	$ 19	371,077	258,589
Balance at beginning (in shares) at Dec. 31, 2020		169,316,421
Balance at beginning at Dec. 31, 2020	640,168	$ 19	364,998	275,151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(39,806)
Balance at ending (in shares) at Jun. 30, 2021		172,798,338
Balance at ending at Jun. 30, 2021	608,574	$ 20	373,209	235,345
Balance at beginning (in shares) at Mar. 31, 2021		171,519,811
Balance at beginning at Mar. 31, 2021	629,685	$ 19	371,077	258,589
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and vesting of restricted stock units, net (shares)		1,278,527
Exercise of common stock options and vesting of restricted stock units, net	216	$ 1	215
Share-based compensation	1,917		1,917
Net loss	(23,244)			(23,244)
Balance at ending (in shares) at Jun. 30, 2021		172,798,338
Balance at ending at Jun. 30, 2021	608,574	$ 20	373,209	235,345
Balance at beginning (in shares) at Dec. 31, 2021		173,468,979
Balance at beginning at Dec. 31, 2021	553,915	$ 17	374,795	179,103
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and vesting of restricted stock units, net (shares)		336,155
Exercise of common stock options and vesting of restricted stock units, net	(92)		(92)
Share-based compensation	1,563		1,563
Net loss	(27,108)			(27,108)
Balance at ending (in shares) at Mar. 31, 2022		173,805,134
Balance at ending at Mar. 31, 2022	528,278	$ 17	376,266	151,995
Balance at beginning (in shares) at Dec. 31, 2021		173,468,979
Balance at beginning at Dec. 31, 2021	553,915	$ 17	374,795	179,103
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(60,583)
Balance at ending (in shares) at Jun. 30, 2022		173,998,968
Balance at ending at Jun. 30, 2022	496,740	$ 17	378,203	118,520
Balance at beginning (in shares) at Mar. 31, 2022		173,805,134
Balance at beginning at Mar. 31, 2022	528,278	$ 17	376,266	151,995
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options and vesting of restricted stock units, net (shares)		193,834
Exercise of common stock options and vesting of restricted stock units, net	15		15
Share-based compensation	1,922		1,922
Net loss	(33,475)			(33,475)
Balance at ending (in shares) at Jun. 30, 2022		173,998,968
Balance at ending at Jun. 30, 2022	$ 496,740	$ 17	$ 378,203	$ 118,520

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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net loss	$ (60,583,000)	$ (39,806,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	554,000	414,000
Amortization and accretion of investments	1,043,000	847,000
Noncash lease expense	613,000	518,000
Inventory write-down	3,313,000	0
Loss on disposal of assets	135,000	0
Share-based compensation	3,485,000	3,427,000
Changes in operating assets and liabilities:
Accounts receivable	(44,000)	0
Inventory	(3,375,000)	0
Prepaid expenses and other assets	595,000	4,939,000
Accounts payable	(4,794,000)	5,940,000
Accrued expenses and other liabilities	4,024,000	(182,000)
Operating lease liabilities	(537,000)	(256,000)
Net cash used in operating activities	(55,571,000)	(24,159,000)
Cash flows from investing activities
Purchase of property and equipment	(559,000)	(965,000)
Payments for security deposit, net	0	(57,000)
Purchase of investments	(106,797,000)	(239,021,000)
Proceeds from sale and maturity of investments	104,492,000	176,358,000
Net cash used in investing activities	(2,864,000)	(63,685,000)
Cash flows from financing activities
Proceeds from exercise of stock warrants, net of issuance costs	0	16,257,000
Payments for Paycheck Protection Program loan	0	(908,000)
Proceeds from exercise of common stock options	54,000	502,000
Taxes paid related to net share settlement of equity awards	(131,000)	0
Net cash (used in) provided by financing activities	(77,000)	15,851,000
Net decrease in cash and cash equivalents and restricted cash	(58,512,000)	(71,993,000)
Cash and cash equivalents and restricted cash, beginning of period	259,110,000	389,705,000
Cash and cash equivalents and restricted cash, end of period	200,598,000	317,712,000
Supplemental disclosure of noncash investing information:
Acquisitions of property and equipment included in accounts payable and other	$ 66,000	$ 268,000

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Overview

6 Months Ended

Jun. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Overview

Note 1. Overview

Hyliion Holdings Corp. is a Delaware corporation headquartered in Cedar Park, Texas. References to the “Company,” Hyliion," "we," or "us" in this report refer to Hyliion Holdings Corp. and its wholly-owned subsidiary, unless expressly indicated or the context otherwise requires.

The Company designs and develops hybrid and fully electric powertrain systems for Class 8 semi-trucks which modify semi-tractors into hybrid and range-extending electric vehicles, respectively. The Company’s hybrid ("Hybrid") system utilizes intelligent electric drive axles with advanced algorithms and battery technology to optimize vehicle performance, enabling fleets to access an easy, efficient way to decrease fuel expenses, lower emissions and/or improve vehicle performance. The Hypertruck ERXTM system utilizes an intelligent electric powertrain with advanced algorithms to optimize emissions performance and efficiency with no new infrastructure required. The Hypertruck ERX system enables fleets to reduce the cost of ownership while providing the ability to deliver net-negative carbon emissions and operate fully electric when needed. The Company recently launched its commercial Hybrid system, and the Hypertruck ERX system is in the design verification phase.

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2022

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Note 2. Summary of Significant Accounting Policies

Basis of Presentation

These condensed consolidated statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”), which permit reduced disclosure for interim periods. All intercompany transactions and balances have been eliminated upon consolidation. The condensed consolidated balance sheet at December 31, 2021 was derived from audited financial statements for the fiscal year then ended, but does not include all necessary disclosures required with respect to annual financial statements. In the opinion of the Company, these condensed consolidated financial statements include all recurring adjustments and normal accruals necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the dates and periods presented. These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company’s 2021 Annual Report. Results for interim periods are not necessarily indicative of the results to be expected for a full fiscal year or for any future period.

These condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and settlement of liabilities in the normal course of business. The Company is an early-stage growth company and has generated negative cash flows from operating activities since inception. At June 30, 2022, the Company had total equity of $496.7 million, inclusive of cash and cash equivalents of $199.9 million and investments of $300.2 million. Based on this, the Company has sufficient funds to continue to execute its business strategy for the next twelve months.

Use of Estimates and Uncertainty of the Coronavirus Pandemic

The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the balance sheet date, as well as reported amounts of expenses during the reporting period. The Company’s most significant estimates and judgments involve revenue recognition, inventory, warranties, income taxes and valuation of share-based compensation. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ from those estimates, and such differences could be material to the Company’s financial statements.

On January 30, 2020, the World Health Organization declared the coronavirus outbreak a “Public Health Emergency of International Concern” and on March 11, 2020, declared the coronavirus outbreak a pandemic. In mid-March 2020, U.S. State Governors, local officials and leaders outside of the U.S. began ordering various “shelter-in-place” orders, which have had various impacts on the U.S. and global economies. This has required greater use of estimates and assumptions in the preparation of the condensed consolidated financial statements.

As the coronavirus pandemic continues to evolve, the Company believes the extent of the impact to its businesses, operating results, cash flows, liquidity and financial condition will be primarily driven by the severity and duration of the coronavirus pandemic, the pandemic’s impact on the U.S. and global economies and the timing, scope and effectiveness of federal, state and local governmental responses to the pandemic. Those primary drivers are beyond the Company’s knowledge and control, and as a result, at this time the Company is unable to predict the cumulative impact, both in terms of severity and duration, that the coronavirus pandemic will have on its business, operating results, cash flows and financial condition, but it could be material if the current circumstances continue to exist for a prolonged period. Although the Company has made its best estimates based

upon current information, actual results could materially differ from the estimates and assumptions. If so, the Company may be subject to future impairment charges as well as changes to recorded reserves and valuations.

Concentration of Supplier Risk

The Company is dependent on certain suppliers, the majority of which are single source suppliers, and the inability of these suppliers to deliver necessary components of the Company’s products in a timely manner at prices, quality levels and volumes that are acceptable, or the Company’s inability to efficiently manage these components from these suppliers, could have a material adverse effect on the Company’s business, prospects, financial condition and operating results.

Cash and Cash Equivalents

The Company considers all highly liquid investments with a maturity date of 90 days or less at the time of purchase to be cash and cash equivalents only if in checking, savings or money market accounts. Cash and cash equivalents include cash held in banks and money market accounts and are carried at cost, which approximates fair value. The Company maintains cash in excess of federally insured limits at financial institutions which it believes are of high credit quality and has not incurred any losses related to these balances to date. The Company believes its credit risk, with respect to these financial institutions to be minimal.

Restricted Cash

The Company has provided its corporate headquarters lessor with a letter of credit for $0.7 million to secure the performance of lease obligations, backed by a restricted cash deposit to pay any draws on the letter of credit by the lessor. Total cash and cash equivalents and restricted cash presented in the condensed consolidated statements of cash flows is summarized as follows:

	June 30, 2022		December 31, 2021		June 30, 2021		December 31, 2020
Cash and cash equivalents	$	199,933	$	258,445	$	317,712	$	389,705
Restricted cash included in other non-current assets	665		665		—		—
	$	200,598	$	259,110	$	317,712	$	389,705

Accounts Receivable

Accounts receivable are stated at gross invoice amount, net of an allowance for doubtful accounts. The allowance for doubtful accounts is maintained at a level considered adequate to provide for potential account losses on the balance based on the Company’s evaluation of the anticipated impact of current economic conditions, changes in the character and size of the balance, past and expected future loss experience and other pertinent factors. At June 30, 2022 and December 31, 2021, accounts receivable included amounts receivable from customers of $0.1 million and $45.0 thousand, respectively. At June 30, 2022 and December 31, 2021, there was no allowance for doubtful accounts required based on the Company's evaluation.

Investments

The Company’s investments consist of corporate bonds, U.S. treasury and agency securities, state and local municipal bonds and commercial paper, all of which are classified as held-to-maturity, with a maturity date of 36-months or less at the time of purchase. The Company determines the appropriate classification of investments at the time of purchase and re-evaluates such designation as of each balance sheet date. Investments are classified as held-to-maturity when the Company has the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity. Such amortization, along with interest, is included in interest income. The Company uses the specific identification method to determine the cost basis of securities sold.

Investments are impaired when a decline in fair value is judged to be other-than-temporary. The Company evaluates investments for impairment by considering the length of time and extent to which market value has been less than cost or amortized cost, the financial condition and near-term prospects of the issuer as well as specific events or circumstances that may influence the operations of the issuer and the Company’s intent to sell the security or the likelihood that it will be required to sell the security before recovery of the entire amortized cost. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded to other income and a new cost basis in the investment is established.

Fair Value Measurements

ASC 820, Fair Value Measurements, clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based upon assumptions that market participants would use in pricing an asset or

liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level I: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the Company can access at the measurement date;

Level II: Significant other observable inputs other than level I prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data; and

Level III: Significant unobservable inputs that reflect the Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

An asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used maximize the use of observable inputs and minimize the use of unobservable inputs.

The Company believes its valuation methods are appropriate and consistent with other market participants, however the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The Company’s financial instruments consist of cash and cash equivalents and restricted cash, accounts receivable, investments, accounts payable and accrued expenses for which the carrying value approximates fair value, exclusive of any interim unrealized gains or losses, because of the short-term nature of the instruments. The fair value of investments are based on quoted prices for identical or similar instruments in markets that are not active. As a result, investments are classified within Level II of the fair value hierarchy.

Revenue

The Company follows five steps to recognize revenue from contracts with customers under ASC 606, Revenue from Contracts with Customers, which are:

Step 1: Identify the contract(s) with a customer;

Step 2: Identify the performance obligations in the contract;

Step 3: Determine the transaction price;

Step 4: Allocate the transaction price to the performance obligations in the contract; and

Step 5: Recognize revenue when (or as) a performance obligation is satisfied.

Revenue is comprised of sales of Hybrid systems for Class 8 semi-trucks and specific other features and services that meet the definition of a performance obligation, including internet connectivity and data processing. We provide installation services for the Hybrid system onto the customers’ vehicle. The Company’s products are marketed and sold to end-user fleet customers in North America. When our contracts with customers contain multiple performance obligations and where material, the contract transaction price is allocated on a relative standalone selling price basis to each performance obligation. There is no meaningful basis on which to disaggregate revenue in the current period.

We recognize revenue on Hybrid system sales upon delivery and acceptance of the vehicle to the customer, which is when control transfers. Contracts are reviewed for significant financing components and payments are typically received within 30 days of delivery. The sale of a Hybrid system to an end-use fleet customer consists of a completed modification to the customer vehicle and the installation services involve significant integration of the Hybrid system with the customer’s vehicle. Installation services are not distinct within the context of the contract and together with the sale of the Hybrid system represent a single performance obligation. We do not offer any sales returns. Amounts billed to customers related to shipping and handling are classified as revenue, and we have elected to recognize the cost for freight and shipping when control has transferred to the customer as a cost of revenue. Our policy is to exclude taxes collected from customers from the transaction price of contracts. In the fourth quarter of fiscal 2021, we began taking deposits to secure future Hypertruck ERX production slots.

Warranties

We provide limited assurance-type warranties under our contracts and do not offer extended warranties or maintenance contracts. The warranty period typically extends for the lesser of two years or 200,000 miles following transfer of control and

solely relate to correction of product defects during the warranty period. We recognize the cost of the warranty upon transfer of control based on estimated and historical claims rates and fulfillment costs, which are variable. Should product failure rates and fulfillment costs differ from these estimates, material revisions to the estimated warranty liability would be required. Warranty expense is recorded as a component of cost of revenue.

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Investments

6 Months Ended

Jun. 30, 2022

Investments, Debt and Equity Securities [Abstract]

Investments

Note 3. Investments

The amortized cost, unrealized gains and losses, fair value and maturities of our held-to-maturity investments at June 30, 2022 and December 31, 2021 are summarized as follows:

			Fair Value Measurements at June 30, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Commercial paper	$	62,127	$	—	$	(313)	$	61,814
U.S. government agency bonds	4,450		—		(222)		4,228
State and municipal bonds	27,962		—		(570)		27,392
Corporate bonds and notes	205,628		—		(3,672)		201,956
	$	300,167	$	—	$	(4,777)	$	295,390

			Fair Value Measurements at December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Commercial paper	$	73,908	$	2	$	(31)	$	73,879
U.S. government agency bonds	4,450		—		(7)		4,443
State and municipal bonds	17,797		—		(115)		17,682
Corporate bonds and notes	202,849		3		(953)		201,899
	$	299,004	$	5	$	(1,106)	$	297,903

	June 30, 2022				December 31, 2021
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in one year or less	$	188,868	$	187,223	$	118,787	$	118,714
Due after one year through five years	111,299		108,167		180,217		179,189
	$	300,167	$	295,390	$	299,004	$	297,903

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Fair Value Measurements

6 Months Ended

Jun. 30, 2022

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 4. Fair Value Measurements

The fair value measurements of our financial assets at June 30, 2022 and December 31, 2021 are summarized as follows:

	Fair Value Measurements at June 30, 2022
	Level I		Level II		Level III		Total
Cash and cash equivalents	$	199,933	$	—	$	—	$	199,933
Restricted cash	665		—		—		665
Held-to-maturity investments:
Commercial paper	—		61,814		—		61,814
U.S. government agency bonds	—		4,228		—		4,228
State and municipal bonds	—		27,392		—		27,392
Corporate bonds and notes	—		201,956		—		201,956
	$	200,598	$	295,390	$	—	$	495,988

	Fair Value Measurements at December 31, 2021
	Level I		Level II		Level III		Total
Cash and cash equivalents	$	258,445	$	—	$	—	$	258,445
Restricted cash	665		—		—		665
Held-to-maturity investments:
Commercial paper	—		73,879		—		73,879
U.S. government agency bonds	—		4,443		—		4,443
State and municipal bonds	—		17,682		—		17,682
Corporate bonds and notes	—		201,899		—		201,899
	$	259,110	$	297,903	$	—	$	557,013

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Inventory

6 Months Ended

Jun. 30, 2022

Inventory Disclosure [Abstract]

Inventory

Note 5. Inventory

The carrying value of our inventory at June 30, 2022 and December 31, 2021 is summarized as follows:

	June 30, 2022		December 31, 2021
Raw materials	$	—	$	—
Work in process	9		4
Finished goods	167		110
	$	176	$	114

During the three and six months ended June 30, 2022, we recorded inventory write-downs of $2.0 million and $3.3 million, respectively. During the three and six months ended June 30, 2021, we recorded no inventory write-downs. These write-downs are included in cost of revenues.

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Share-Based Compensation

6 Months Ended

Jun. 30, 2022

Share-Based Payment Arrangement [Abstract]

Share-Based Compensation

Note 6. Share-Based Compensation

During the six months ended June 30, 2022 and 2021, the Company granted 2.1 million and 3.3 million, respectively, restricted stock units which will vest over a period of one to four years, some of which include performance criteria based on the achievement of key Company milestones. During the six months ended June 30, 2022 and 2021, 0.5 million and 0.3 million, respectively, restricted stock units and options were forfeited. Share-based compensation expense for the three and six months ended June 30, 2022 was $1.9 million and $3.5 million, respectively. Share-based compensation expense for the three and six months ended June 30, 2021 was $1.9 million and $3.4 million, respectively.

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Accrued Expenses and Other Current Liabilities

6 Months Ended

Jun. 30, 2022

Accrued Liabilities and Other Liabilities [Abstract]

Accrued Expenses and Other Current Liabilities

Note 7. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities at June 30, 2022 and December 31, 2021 are summarized as follows:

	June 30, 2022		December 31, 2021
Accrued professional services and other	$	7,259	$	3,681
Accrued compensation and related benefits	3,246		3,460
Other accrued liabilities	672		618
	$	11,177	$	7,759

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Warranties

6 Months Ended

Jun. 30, 2022

Guarantees and Product Warranties [Abstract]

Warranties

Note 8. Warranties

The change in warranty liability for the three and six months ended June 30, 2022 and 2021 is summarized as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Balance at beginning of period	$	238	$	—	$	44	$	—
Provision for new warranties	124		—		331		—
Net changes in accrual related to pre-existing warranties	9		—		—		—
Warranty costs incurred	(23)		—		(27)		—
Balance at end of period	$	348	$	—	$	348	$	—

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 9. Commitments and Contingencies

Legal Proceedings

The Company is periodically involved in legal proceedings, legal actions and claims arising in the normal course of business, including proceedings relating to product liability, intellectual property, safety and health, employment and other matters. The Company believes that the outcome of such legal proceedings, legal actions and claims will not have a significant adverse effect on the Company’s financial position, results of operations or cash flows.

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Net Loss Per Share

6 Months Ended

Jun. 30, 2022

Earnings Per Share [Abstract]

Net Loss Per Share

Note 10. Net Loss Per Share

The computation of basic and diluted net loss per share for the three and six months ended June 30, 2022 and 2021 is summarized as follows (in thousands, except share and per share data):

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Numerator:
Net loss attributable to common stockholders	$	(33,475)	$	(23,244)	$	(60,583)	$	(39,806)
Denominator:
Weighted average shares outstanding, basic and diluted	173,897,517		172,260,525		173,741,910		171,260,671
Net loss per share, basic and diluted	$	(0.19)	$	(0.13)	$	(0.35)	$	(0.23)

Potential common shares excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect for the three and six months ended June 30, 2022 and 2021 are summarized as follows:

	Three and Six Months Ended June 30,
	2022	2021
Unexercised stock options	2,761,006	3,852,897
Unvested restricted stock units*	4,154,423	3,194,865
	6,915,429	7,047,762

* Potential common shares from unvested restricted stock units for the periods ended June 30, 2022 and 2021 include 1,361,667 and 1,743,750 shares, respectively, where no accounting grant date has been established.

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2022

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

These condensed consolidated statements include the accounts of the Company and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and pursuant to the rules and regulations of the United States Securities and Exchange Commission (“SEC”), which permit reduced disclosure for interim periods. All intercompany transactions and balances have been eliminated upon consolidation. The condensed consolidated balance sheet at December 31, 2021 was derived from audited financial statements for the fiscal year then ended, but does not include all necessary disclosures required with respect to annual financial statements. In the opinion of the Company, these condensed consolidated financial statements include all recurring adjustments and normal accruals necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the dates and periods presented. These condensed consolidated financial statements and accompanying notes should be read in conjunction with the Company’s 2021 Annual Report. Results for interim periods are not necessarily indicative of the results to be expected for a full fiscal year or for any future period.

These condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and settlement of liabilities in the normal course of business. The Company is an early-stage growth company and has generated negative cash flows from operating activities since inception.

Use of Estimates and Uncertainty of the Coronavirus Pandemic

Use of Estimates and Uncertainty of the Coronavirus Pandemic

The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the balance sheet date, as well as reported amounts of expenses during the reporting period. The Company’s most significant estimates and judgments involve revenue recognition, inventory, warranties, income taxes and valuation of share-based compensation. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ from those estimates, and such differences could be material to the Company’s financial statements.

On January 30, 2020, the World Health Organization declared the coronavirus outbreak a “Public Health Emergency of International Concern” and on March 11, 2020, declared the coronavirus outbreak a pandemic. In mid-March 2020, U.S. State Governors, local officials and leaders outside of the U.S. began ordering various “shelter-in-place” orders, which have had various impacts on the U.S. and global economies. This has required greater use of estimates and assumptions in the preparation of the condensed consolidated financial statements.

As the coronavirus pandemic continues to evolve, the Company believes the extent of the impact to its businesses, operating results, cash flows, liquidity and financial condition will be primarily driven by the severity and duration of the coronavirus pandemic, the pandemic’s impact on the U.S. and global economies and the timing, scope and effectiveness of federal, state and local governmental responses to the pandemic. Those primary drivers are beyond the Company’s knowledge and control, and as a result, at this time the Company is unable to predict the cumulative impact, both in terms of severity and duration, that the coronavirus pandemic will have on its business, operating results, cash flows and financial condition, but it could be material if the current circumstances continue to exist for a prolonged period. Although the Company has made its best estimates based

upon current information, actual results could materially differ from the estimates and assumptions. If so, the Company may be subject to future impairment charges as well as changes to recorded reserves and valuations.

Concentration of Supplier Risk

Concentration of Supplier Risk

The Company is dependent on certain suppliers, the majority of which are single source suppliers, and the inability of these suppliers to deliver necessary components of the Company’s products in a timely manner at prices, quality levels and volumes that are acceptable, or the Company’s inability to efficiently manage these components from these suppliers, could have a material adverse effect on the Company’s business, prospects, financial condition and operating results.

Cash and Cash Equivalents

Cash and Cash Equivalents

The Company considers all highly liquid investments with a maturity date of 90 days or less at the time of purchase to be cash and cash equivalents only if in checking, savings or money market accounts. Cash and cash equivalents include cash held in banks and money market accounts and are carried at cost, which approximates fair value. The Company maintains cash in excess of federally insured limits at financial institutions which it believes are of high credit quality and has not incurred any losses related to these balances to date. The Company believes its credit risk, with respect to these financial institutions to be minimal.

Restricted Cash

Restricted CashThe Company has provided its corporate headquarters lessor with a letter of credit for $0.7 million to secure the performance of lease obligations, backed by a restricted cash deposit to pay any draws on the letter of credit by the lessor.

Accounts Receivable

Accounts ReceivableAccounts receivable are stated at gross invoice amount, net of an allowance for doubtful accounts. The allowance for doubtful accounts is maintained at a level considered adequate to provide for potential account losses on the balance based on the Company’s evaluation of the anticipated impact of current economic conditions, changes in the character and size of the balance, past and expected future loss experience and other pertinent factors.

Investments

Investments

The Company’s investments consist of corporate bonds, U.S. treasury and agency securities, state and local municipal bonds and commercial paper, all of which are classified as held-to-maturity, with a maturity date of 36-months or less at the time of purchase. The Company determines the appropriate classification of investments at the time of purchase and re-evaluates such designation as of each balance sheet date. Investments are classified as held-to-maturity when the Company has the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost, adjusted for amortization of premiums and accretion of discounts to maturity. Such amortization, along with interest, is included in interest income. The Company uses the specific identification method to determine the cost basis of securities sold.

Investments are impaired when a decline in fair value is judged to be other-than-temporary. The Company evaluates investments for impairment by considering the length of time and extent to which market value has been less than cost or amortized cost, the financial condition and near-term prospects of the issuer as well as specific events or circumstances that may influence the operations of the issuer and the Company’s intent to sell the security or the likelihood that it will be required to sell the security before recovery of the entire amortized cost. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded to other income and a new cost basis in the investment is established.

Fair Value Measurements

Fair Value Measurements

ASC 820, Fair Value Measurements, clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based upon assumptions that market participants would use in pricing an asset or

liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level I: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the Company can access at the measurement date;

Level II: Significant other observable inputs other than level I prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data; and

Level III: Significant unobservable inputs that reflect the Company’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.

An asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques used maximize the use of observable inputs and minimize the use of unobservable inputs.

The Company believes its valuation methods are appropriate and consistent with other market participants, however the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.

The Company’s financial instruments consist of cash and cash equivalents and restricted cash, accounts receivable, investments, accounts payable and accrued expenses for which the carrying value approximates fair value, exclusive of any interim unrealized gains or losses, because of the short-term nature of the instruments. The fair value of investments are based on quoted prices for identical or similar instruments in markets that are not active. As a result, investments are classified within Level II of the fair value hierarchy.

Revenue

Revenue

The Company follows five steps to recognize revenue from contracts with customers under ASC 606, Revenue from Contracts with Customers, which are:

Step 1: Identify the contract(s) with a customer;

Step 2: Identify the performance obligations in the contract;

Step 3: Determine the transaction price;

Step 4: Allocate the transaction price to the performance obligations in the contract; and

Step 5: Recognize revenue when (or as) a performance obligation is satisfied.

Revenue is comprised of sales of Hybrid systems for Class 8 semi-trucks and specific other features and services that meet the definition of a performance obligation, including internet connectivity and data processing. We provide installation services for the Hybrid system onto the customers’ vehicle. The Company’s products are marketed and sold to end-user fleet customers in North America. When our contracts with customers contain multiple performance obligations and where material, the contract transaction price is allocated on a relative standalone selling price basis to each performance obligation. There is no meaningful basis on which to disaggregate revenue in the current period.

We recognize revenue on Hybrid system sales upon delivery and acceptance of the vehicle to the customer, which is when control transfers. Contracts are reviewed for significant financing components and payments are typically received within 30 days of delivery. The sale of a Hybrid system to an end-use fleet customer consists of a completed modification to the customer vehicle and the installation services involve significant integration of the Hybrid system with the customer’s vehicle. Installation services are not distinct within the context of the contract and together with the sale of the Hybrid system represent a single performance obligation. We do not offer any sales returns. Amounts billed to customers related to shipping and handling are classified as revenue, and we have elected to recognize the cost for freight and shipping when control has transferred to the customer as a cost of revenue. Our policy is to exclude taxes collected from customers from the transaction price of contracts.

Warranties

Warranties

We provide limited assurance-type warranties under our contracts and do not offer extended warranties or maintenance contracts. The warranty period typically extends for the lesser of two years or 200,000 miles following transfer of control and

solely relate to correction of product defects during the warranty period. We recognize the cost of the warranty upon transfer of control based on estimated and historical claims rates and fulfillment costs, which are variable. Should product failure rates and fulfillment costs differ from these estimates, material revisions to the estimated warranty liability would be required. Warranty expense is recorded as a component of cost of revenue.

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2022

Accounting Policies [Abstract]

Restrictions on cash and cash equivalents

Total cash and cash equivalents and restricted cash presented in the condensed consolidated statements of cash flows is summarized as follows:

	June 30, 2022		December 31, 2021		June 30, 2021		December 31, 2020
Cash and cash equivalents	$	199,933	$	258,445	$	317,712	$	389,705
Restricted cash included in other non-current assets	665		665		—		—
	$	200,598	$	259,110	$	317,712	$	389,705

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Investments (Tables)

6 Months Ended

Jun. 30, 2022

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost, unrealized gains and losses, and fair value

The amortized cost, unrealized gains and losses, fair value and maturities of our held-to-maturity investments at June 30, 2022 and December 31, 2021 are summarized as follows:

			Fair Value Measurements at June 30, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Commercial paper	$	62,127	$	—	$	(313)	$	61,814
U.S. government agency bonds	4,450		—		(222)		4,228
State and municipal bonds	27,962		—		(570)		27,392
Corporate bonds and notes	205,628		—		(3,672)		201,956
	$	300,167	$	—	$	(4,777)	$	295,390

			Fair Value Measurements at December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Commercial paper	$	73,908	$	2	$	(31)	$	73,879
U.S. government agency bonds	4,450		—		(7)		4,443
State and municipal bonds	17,797		—		(115)		17,682
Corporate bonds and notes	202,849		3		(953)		201,899
	$	299,004	$	5	$	(1,106)	$	297,903

Schedule of investment maturity

	June 30, 2022				December 31, 2021
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in one year or less	$	188,868	$	187,223	$	118,787	$	118,714
Due after one year through five years	111,299		108,167		180,217		179,189
	$	300,167	$	295,390	$	299,004	$	297,903

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2022

Fair Value Disclosures [Abstract]

Schedule of assets measured at fair value on a recurring basis

The fair value measurements of our financial assets at June 30, 2022 and December 31, 2021 are summarized as follows:

	Fair Value Measurements at June 30, 2022
	Level I		Level II		Level III		Total
Cash and cash equivalents	$	199,933	$	—	$	—	$	199,933
Restricted cash	665		—		—		665
Held-to-maturity investments:
Commercial paper	—		61,814		—		61,814
U.S. government agency bonds	—		4,228		—		4,228
State and municipal bonds	—		27,392		—		27,392
Corporate bonds and notes	—		201,956		—		201,956
	$	200,598	$	295,390	$	—	$	495,988

	Fair Value Measurements at December 31, 2021
	Level I		Level II		Level III		Total
Cash and cash equivalents	$	258,445	$	—	$	—	$	258,445
Restricted cash	665		—		—		665
Held-to-maturity investments:
Commercial paper	—		73,879		—		73,879
U.S. government agency bonds	—		4,443		—		4,443
State and municipal bonds	—		17,682		—		17,682
Corporate bonds and notes	—		201,899		—		201,899
	$	259,110	$	297,903	$	—	$	557,013

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Inventory (Tables)

6 Months Ended

Jun. 30, 2022

Inventory Disclosure [Abstract]

Schedule of inventory

The carrying value of our inventory at June 30, 2022 and December 31, 2021 is summarized as follows:

	June 30, 2022		December 31, 2021
Raw materials	$	—	$	—
Work in process	9		4
Finished goods	167		110
	$	176	$	114

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Accrued Expenses and Other Current Liabilities (Tables)

6 Months Ended

Jun. 30, 2022

Accrued Liabilities and Other Liabilities [Abstract]

Schedule of accrued expenses and other current liabilities

Accrued expenses and other current liabilities at June 30, 2022 and December 31, 2021 are summarized as follows:

	June 30, 2022		December 31, 2021
Accrued professional services and other	$	7,259	$	3,681
Accrued compensation and related benefits	3,246		3,460
Other accrued liabilities	672		618
	$	11,177	$	7,759

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Warranties (Tables)

6 Months Ended

Jun. 30, 2022

Guarantees and Product Warranties [Abstract]

Schedule of product warranty liability

The change in warranty liability for the three and six months ended June 30, 2022 and 2021 is summarized as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Balance at beginning of period	$	238	$	—	$	44	$	—
Provision for new warranties	124		—		331		—
Net changes in accrual related to pre-existing warranties	9		—		—		—
Warranty costs incurred	(23)		—		(27)		—
Balance at end of period	$	348	$	—	$	348	$	—

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Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2022

Earnings Per Share [Abstract]

Schedule of basic and diluted net (loss) income per share

The computation of basic and diluted net loss per share for the three and six months ended June 30, 2022 and 2021 is summarized as follows (in thousands, except share and per share data):

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Numerator:
Net loss attributable to common stockholders	$	(33,475)	$	(23,244)	$	(60,583)	$	(39,806)
Denominator:
Weighted average shares outstanding, basic and diluted	173,897,517		172,260,525		173,741,910		171,260,671
Net loss per share, basic and diluted	$	(0.19)	$	(0.13)	$	(0.35)	$	(0.23)

Schedule of weighted average potential common shares

Potential common shares excluded from the computation of diluted net loss per share because including them would have had an anti-dilutive effect for the three and six months ended June 30, 2022 and 2021 are summarized as follows:

	Three and Six Months Ended June 30,
	2022	2021
Unexercised stock options	2,761,006	3,852,897
Unvested restricted stock units*	4,154,423	3,194,865
	6,915,429	7,047,762

* Potential common shares from unvested restricted stock units for the periods ended June 30, 2022 and 2021 include 1,361,667 and 1,743,750 shares, respectively, where no accounting grant date has been established.

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Summary of Significant Accounting Policies - Narrative (Details)	6 Months Ended
	Jun. 30, 2022 USD ($) mi	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Total equity	$ 496,740,000	$ 528,278,000	$ 553,915,000	$ 608,574,000	$ 629,685,000	$ 640,168,000
Cash and cash equivalents	199,933,000		258,445,000
Total investments	300,200,000
Letter of credit	700,000
Accounts receivable from customers	100,000		45,000
Allowance for doubtful accounts	$ 0		$ 0
Maturity date (or less)	36 months
Warranty period extend	2 years
Warrant extension, mileage | mi	200,000

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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Cash and cash equivalents	$ 199,933	$ 258,445	$ 317,712	$ 389,705
Restricted cash included in other non-current assets	665	665	0	0
Total presented in the consolidated statements of cash flows	$ 200,598	$ 259,110	$ 317,712	$ 389,705

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Investments - Schedule of amortized cost, unrealized gains and losses, and fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 300,167	$ 299,004
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(4,777)	(1,106)
Fair Value	295,390	297,903
Corporate bonds and notes
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	205,628	202,849
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(3,672)	(953)
Fair Value	201,956	201,899
Commercial paper
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	62,127	73,908
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(313)	(31)
Fair Value	61,814	73,879
U.S. government agency bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,450	4,450
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(222)	(7)
Fair Value	4,228	4,443
State and municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	27,962	17,797
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(570)	(115)
Fair Value	$ 27,392	$ 17,682

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Investments - Schedule of investment maturity - (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 188,868	$ 118,787
Due after one year through five years	111,299	180,217
Amortized Cost	300,167	299,004
Fair Value
Due in one year or less	187,223	118,714
Due after one year through five years	108,167	179,189
Debt Securities, Held-to-maturity, Fair Value, Total	$ 295,390	$ 297,903

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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 199,933	$ 258,445
Restricted cash	665	665	$ 0	$ 0
Held-to-maturity investments:	295,390	297,903
Total assets	495,988	557,013
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	61,814	73,879
U.S. government agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	4,228	4,443
State and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	27,392	17,682
Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	201,956	201,899
Level I
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	199,933	258,445
Restricted cash	665	665
Total assets	200,598	259,110
Level I | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	0	0
Level I | U.S. government agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	0	0
Level I | State and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	0	0
Level I | Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	0	0
Level II
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets	295,390	297,903
Level II | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	61,814	73,879
Level II | U.S. government agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	4,228	4,443
Level II | State and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	27,392	17,682
Level II | Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	201,956	201,899
Level III
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash	0	0
Total assets	0	0
Level III | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	0	0
Level III | U.S. government agency bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	0	0
Level III | State and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	0	0
Level III | Corporate bonds and notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Held-to-maturity investments:	$ 0	$ 0

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Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 0	$ 0
Work in process	9	4
Finished goods	167	110
Inventory, Net, Total	$ 176	$ 114

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Inventory - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Inventory Disclosure [Abstract]
Inventory write-down	$ 2,000,000	$ 0	$ 3,313,000	$ 0

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Share-Based Compensation (Details) - Restricted Stock Units (RSUs) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)			2.1	3.3
Forfeited in period (in shares)			0.5	0.3
Share-based compensation expense	$ 1.9	$ 1.9	$ 3.5	$ 3.4
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years

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Accrued Expenses and Other Current Liabilities - Schedule of accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accrued Liabilities and Other Liabilities [Abstract]
Accrued professional services and other	$ 7,259	$ 3,681
Accrued compensation and related benefits	3,246	3,460
Other accrued liabilities	672	618
Total	$ 11,177	$ 7,759

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Warranties (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning Balance	$ 238	$ 0	$ 44	$ 0
Provision for new warranties	124	0	331	0
Net changes in accrual related to pre-existing warranties	9	0	0	0
Warranty costs incurred	(23)	0	(27)	0
Ending Balance	$ 348	$ 0	$ 348	$ 0

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Net Loss Per Share - Schedule of basic and diluted net loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net loss attributable to common stockholders	$ (33,475)	$ (27,108)	$ (23,244)	$ (16,562)	$ (60,583)	$ (39,806)
Denominator:
Weighted-average shares outstanding, basic (in shares)	173,897,517		172,260,525		173,741,910	171,260,671
Weighted-average shares outstanding, diluted (in shares)	173,897,517		172,260,525		173,741,910	171,260,671
Net loss per share, basic (in USD per share)	$ (0.19)		$ (0.13)		$ (0.35)	$ (0.23)
Net loss per share, diluted (in USD per share)	$ (0.19)		$ (0.13)		$ (0.35)	$ (0.23)

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Net Loss Per Share - Schedule of common shares income per share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares excluded from computation of diluted Net (loss) income per share (in shares)	6,915,429	7,047,762	6,915,429	7,047,762
Unexercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares excluded from computation of diluted Net (loss) income per share (in shares)	2,761,006	3,852,897	2,761,006	3,852,897
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares excluded from computation of diluted Net (loss) income per share (in shares)	4,154,423	3,194,865	4,154,423	3,194,865
Restricted stock units (RSUs), grant date not yet established
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares excluded from computation of diluted Net (loss) income per share (in shares)	1,361,667	1,361,667	1,743,750	1,743,750