10-Q

00

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended September 30, 2024

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 Number: 001-41013

GCT Semiconductor Holding, Inc.

(Exact Name of Registrant as Specified in its Charter)

Delaware	86-2171699
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
2290 North 1st Street, Suite 201 San Jose, California	95131
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (408) 434‑6040

Not Applicable

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	GCTS	The New York Stock Exchange
Warrants, each whole warrant exercisable for one share of Common Stock for $11.50 per share	GCTSW	The New York Stock Exchange

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 ☒ 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 ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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	☐	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 ☒

As of November 11, 2024, the registrant had 47,736,824 shares of common stock, $0.0001 par value per share, outstanding.

Special Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10‑Q contains forward-looking statements within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, including statements about our financial condition, results of operations, earnings outlook and our prospects. 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. Forward-looking statements are typically identified by words such as “plan,” “believe,” “expect,” “anticipate,” “intend,” “outlook,” “estimate,” “forecast,” “project,” “continue,” “could,” “may,” “might,” “possible,” “potential,” “predict,” “should,” “would” and other similar words and expressions, but the absence of these words does not mean that a statement is not forward-looking.

The forward-looking statements are based on the current expectations of our management and are inherently subject to uncertainties and changes in circumstances and their potential effects and speak only as of the date of such statement. These forward-looking statements involve a number of risks, uncertainties or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to, the following:

•our financial and business performance, including our financial projections and business metrics;

•changes in our strategy, future operations, financial position, estimated revenues and losses, forecasts, projected costs;

•macroeconomic conditions, including labor disputes, inflationary impacts and disruptions to the global supply chain;

•increase in supply chain costs, including raw materials, sourcing, transportation and energy;

•the impact of tariffs and trade policies, particularly with respect to China;

•our inability to anticipate the future market demands and future needs of our customers;

•our ability to develop new 5th generation (“5G”) products under collaboration agreements with our major partners;

•the impact of component shortages, suppliers’ lack of production capacity, natural disasters or pandemics on our sourcing operations and supply chain;

•our future capital requirements and sources and uses of cash;

•our ability to cover our future capital expenditures and to pay down our near-term debt obligations;

•our ability to obtain funding for its operations;

•our anticipated financial performance, including gross margin, and the expectation that our future results of operations will fluctuate on a quarterly basis for the foreseeable future;

•our expected capital expenditures, cost of revenue and other future expenses, and the sources of funds to satisfy the liquidity needs of the Company;

•the outcome of any legal proceedings that may be instituted against us following completion of the Business Combination and transactions contemplated thereby;

•our ability to maintain the listing of our common stock on the NYSE;

•the risk that the Business Combination disrupts current plans and operations;

•the ability to recognize the anticipated benefits of the Business Combination, which may be affected by, among other things, competition, and the ability of us to grow and manage growth profitably;

•technology, cybersecurity, and data privacy risks;

•geopolitical conditions, including political instability in the U.S. and abroad, unrest and sanctions, war, conflict, including the ongoing conflicts between Russia and Ukraine, conflicts in the Middle East, and increasing tensions between China and Taiwan;

•legislative or regulatory risks relating to climate change;

•reputational risks; and

•other risks and uncertainties indicated in this Quarterly Report on Form 10‑Q, including those set forth under the section entitled “Risk Factors.”

i

A detailed discussion of risks and uncertainties that could cause actual results and events to differ materially from such forward-looking statements is included in the section entitled “Risk Factors” contained in our Form S‑1 filed with the Securities and Exchange Commission (“SEC”) on May 22, 2024, as amended. These forward-looking statements are based on information available as of the date of this Quarterly Report on Form 10‑Q, and current expectations, forecasts and assumptions, and involve a number of judgments, risks and uncertainties. New risk factors emerge from time to time, and it is not possible for us to predict all such risk factors, nor can we assess the impact of all such risk factors on our business or the extent to which any factor or combination of factors may cause actual results to differ materially from those contained in any forward-looking statements. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the foregoing cautionary statements. We undertake no obligations to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

ii

Table of Contents

		Page
Part I.	FINANCIAL INFORMATION	1
Item 1.	Financial Statements (Unaudited)	1
	Condensed Consolidated Balance Sheets	1
	Condensed Consolidated Statements of Operations	2
	Condensed Consolidated Statements of Comprehensive Loss	3
	Condensed Consolidated Statements of Stockholders’ Deficit	4
	Condensed Consolidated Statements of Cash Flows	6
	Notes to Unaudited Condensed Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	27
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	40
Item 4.	Controls and Procedures	40
Part II.	OTHER INFORMATION	41
Item 1.	Legal Proceedings	41
Item 1A.	Risk Factors	41
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	42
Item 3.	Defaults Upon Senior Securities	42
Item 4.	Mine Safety Disclosures	42
Item 5.	Other Information	42
Item 6.	Exhibits	43
Signatures		44

iii

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements (Unaudited).

GCT SEMICONDUCTOR HOLDING, INC.

Condensed Consolidated Balance Sheets

(unaudited, in thousands, except per share amounts)

	September 30, 2024			December 31, 2023
Assets
Current assets:
Cash and cash equivalents	$	1,812		$	258
Accounts receivable, net		6,441			4,920
Inventory		3,110			1,486
Contract assets		5,098			3,439
Prepaid expenses and other current assets		3,545			2,906
Total current assets		20,006			13,009
Property and equipment, net		641			772
Operating lease right-of-use assets		1,065			1,521
Intangibles, net		99			245
Other assets		810			881
Total assets	$	22,621		$	16,428
Liabilities and Stockholders’ Deficit
Current liabilities:
Accounts payable	$	1,070		$	17,814
Contract liabilities		511			48
Accrued and other current liabilities		22,365			23,956
Common stock forward liability		451			—
Borrowings		32,819			44,509
Convertible promissory notes, current		4,008			27,794
Operating lease liabilities, current		724			680
Total current liabilities		61,948			114,801
Convertible promissory notes, net of current		4,830			6,239
Net defined benefit liabilities		8,052			7,689
Long-term operating lease liabilities		358			850
Income taxes payable		2,245			2,178
Warrant liabilities		3,197			—
Other liabilities		242			108
Total liabilities		80,872			131,865
Commitments and contingencies (Note 8)
Stockholders’ deficit:
Preferred stock, par value $0.0001 per share; 40,000 and 82,352 shares authorized as of    September 30, 2024 and December 31, 2023, respectively; no shares issued and    outstanding as of September 30, 2024 and December 31, 2023		—			—
Common stock, par value $0.0001 per share; 400,000 and 200,000 shares authorized as of    September 30, 2024 and December 31, 2023, respectively; 47,611 and 24,166 shares    issued and outstanding as of September 30, 2024 and December 31, 2023, respectively(1)		5			3
Additional paid-in capital(1)		499,751			435,752
Accumulated other comprehensive loss		(946	)		(1,538	)
Accumulated deficit		(557,061	)		(549,654	)
Total stockholders’ deficit		(58,251	)		(115,437	)
Total liabilities and stockholders’ deficit	$	22,621		$	16,428

(1)Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements.)

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

1

GCT SEMICONDUCTOR HOLDING, INC.

Condensed Consolidated Statements of Operations

(unaudited, in thousands, except per share amounts)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2024			2023			2024			2023
Net revenues:
Product	$	1,715		$	4,026		$	4,111		$	8,667
Service		895			450			3,232			3,172
Total net revenues		2,610			4,476			7,343			11,839
Cost of net revenues:
Product		710			3,985			1,522			5,954
Service		274			(36	)		1,321			1,006
Total cost of net revenues		984			3,949			2,843			6,960
Gross profit		1,626			527			4,500			4,879
Operating expenses:
Research and development		4,210			2,367			13,895			7,254
Sales and marketing		949			744			2,921			2,337
General and administrative		2,379			1,433			8,075			5,537
Gain on extinguishment of liability		—			—			(14,636	)		—
Total operating expenses		7,538			4,544			10,255			15,128
Loss from operations		(5,912	)		(4,017	)		(5,755	)		(10,249	)
Interest expense		(667	)		(1,220	)		(3,509	)		(4,878	)
Other income (expenses), net		(481	)		929			2,044			2,946
Loss before provision for income taxes		(7,060	)		(4,308	)		(7,220	)		(12,181	)
Provision for income taxes		61			38			187			125
Net loss	$	(7,121	)	$	(4,346	)	$	(7,407	)	$	(12,306	)
Net loss per common share(1):
Basic and diluted	$	(0.16	)	$	(0.18	)	$	(0.19	)	$	(0.51	)
Weighted-average common shares outstanding(1):
Basic and diluted		45,645			24,055			38,418			23,934

(1)Amounts for the three and nine months ended September 30, 2023 and before that date differ from those in prior year condensed consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements).

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

2

GCT SEMICONDUCTOR HOLDING, INC.

Condensed Consolidated Statements of Comprehensive Loss

(unaudited, in thousands)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2024			2023			2024			2023
Comprehensive loss, net of taxes:
Net loss	$	(7,121	)	$	(4,346	)	$	(7,407	)	$	(12,306	)
Foreign currency translation adjustment		(1,180	)		537			592			1,386
Comprehensive loss	$	(8,301	)	$	(3,809	)	$	(6,815	)	$	(10,920	)

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

3

GCT SEMICONDUCTOR HOLDING, INC.

Condensed Consolidated Statements of Stockholders’ Deficit

(unaudited, in thousands)

									Accumulated
							Additional		Other						Total
	Common Stock						Paid-In		Comprehensive			Accumulated			Stockholders’
	Shares			Amount			Capital		Income (Loss)			Deficit			Deficit
Balance as of December 31, 2023		129,396		$	129		$	435,626	$	(1,538	)	$	(549,654	)	$	(115,437	)
Reverse recapitalization		(105,230	)		(126	)		126		—			—			—
Balance as of December 31, 2023(1)		24,166			3			435,752		(1,538	)		(549,654	)		(115,437	)
Reverse recapitalization transaction, net of transaction costs    and acquired liabilities		21,667			2			50,031		—			—			50,033
Stock-based compensation		—			—			1,223		—			—			1,223
Foreign currency translation adjustment		—			—			—		1,064			—			1,064
Net income		—			—			—		—			757			757
Balance as of March 31, 2024		45,833			5			487,006		(474	)		(548,897	)		(62,360	)
Issuance of common stock under common stock purchase    agreement		679			—			3,388		—			—			3,388
Issuance of commitment shares in connection with common    stock purchase agreement		57			—			—		—			—			—
Issuance of common stock to underwriter		110			—			667		—			—			667
Stock-based compensation		—			—			323		—			—			323
Foreign currency translation adjustment		—			—			—		708			—			708
Net loss		—			—			—		—			(1,043	)		(1,043	)
Balance as of June 30, 2024		46,679			5			491,384		234			(549,940	)		(58,317	)
Issuance of common stock under common stock purchase    agreement		1,422			—			5,541		—			—			5,541
Issuance of common stock and common stock warrants    in a private placement		742			—			2,240		—			—			2,240
Issuance of common stock upon exercise of stock options		118			—			13		—			—			13
Forfeiture of unvested sponsor earnout shares		(1,350	)		—			—		—			—			—
Stock-based compensation		—			—			573		—			—			573
Foreign currency translation adjustment		—			—			—		(1,180	)		—			(1,180	)
Net loss		—			—			—		—			(7,121	)		(7,121	)
Balance as of September 30, 2024		47,611		$	5		$	499,751	$	(946	)	$	(557,061	)	$	(58,251	)

(1)Amounts as of December 31, 2023 and before that date differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements).

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

4

GCT SEMICONDUCTOR HOLDING, INC.

Condensed Consolidated Statements of Stockholders’ Deficit

(unaudited, in thousands)

									Accumulated
							Additional		Other						Total
	Common Stock						Paid-In		Comprehensive			Accumulated			Stockholders’
	Shares			Amount			Capital		Income (Loss)			Deficit			Deficit
Balance as of December 31, 2022		127,761		$	128		$	433,990	$	(1,862	)	$	(527,185	)	$	(94,929	)
Reverse recapitalization		(103,900	)		(126	)		126		—			—			—
Balance as of December 31, 2022(1)		23,861			2			434,116		(1,862	)		(527,185	)		(94,929	)
Issuance of common stock upon exercise of stock options(1)		5			—			1		—			—			1
Stock-based compensation		—			—			2		—			—			2
Foreign currency translation adjustment		—			—			—		674			—			674
Net loss		—			—			—		—			(1,393	)		(1,393	)
Balance as of March 31, 2023(1)		23,866			2			434,119		(1,188	)		(528,578	)		(95,645	)
Issuance of common stock upon exercise of stock options(1)		33			—			4		—			—			4
Issuance of common stock from convertible promissory notes    conversion(1)		4			—			72		—			—			72
Stock-based compensation		—			—			3		—			—			3
Foreign currency translation adjustment		—			—			—		175			—			175
Net loss		—			—			—		—			(6,567	)		(6,567	)
Balance as of June 30, 2023(1)		23,903			2			434,198		(1,013	)		(535,145	)		(101,958	)
Issuance of common stock upon exercise of stock options(1)		171			1			17		—			—			18
Issuance of common stock from convertible promissory notes    conversion(1)		1			—			—		—			—			—
Stock-based compensation		—			—			3		—			—			3
Foreign currency translation adjustment		—			—			—		537			—			537
Net loss		—			—			—		—			(4,346	)		(4,346	)
Balance as of September 30, 2023(1)		24,075		$	3		$	434,218	$	(476	)	$	(539,491	)	$	(105,746	)

(1)Amounts as of December 31, 2023 and before that date differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements).

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

5

GCT SEMICONDUCTOR HOLDING, INC.

Condensed Consolidated Statements of Cash Flows

(unaudited, in thousands)

	Nine Months Ended September 30,
	2024			2023
Operating activities:
Net loss	$	(7,407	)	$	(12,306	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		528			654
Operating lease right-of-use amortization		463			581
Stock-based compensation		2,119			8
Issuance of common stock to underwriter		667			—
Change in credit loss allowance		(547	)		793
Change in fair value of convertible promissory notes		1,354			(1,116	)
Change in fair value of warrant liabilities		(2,761	)		—
Loss from initial recognition of common stock forward liability		586			—
Gain on extinguishment of liability		(14,636	)		—
Changes in operating assets and liabilities:
Accounts receivable		(895	)		(3,290	)
Inventory		(1,624	)		1,816
Contract assets		(1,659	)		(1,984	)
Prepaid expenses and other current assets		(21	)		785
Other assets		70			87
Accounts payable		(2,328	)		(744	)
Contract liabilities		463			16
Accrued and other current liabilities		(3,040	)		7,387
Net defined benefit liabilities		674			328
Income tax payable		35			(135	)
Lease liabilities		(455	)		(797	)
Other liabilities		(275	)		(3	)
Net cash used in operating activities		(28,689	)		(7,920	)
Investing activities:
Purchases of property and equipment		(185	)		(284	)
Net cash used in investing activities		(185	)		(284	)
Financing activities:
Proceeds from reverse recapitalization and PIPE Financing, net of transaction costs		17,238			—
Proceeds from issuance of convertible promissory notes		16,290			—
Proceeds from issuance of common stock under common stock purchase agreement		7,814			—
Proceeds from issuance of common stock and common stock warrants in a private placement		2,240			—
Proceeds from borrowings		3,696			7,604
Proceeds from exercise of stock options		13			23
Repayments of borrowings		(14,065	)		(23	)
Repayments of convertible promissory notes		(1,630	)		—
Payments of financial lease liabilities		—			(13	)
Net cash provided by financing activities		31,596			7,591
Effect of exchange rate changes on cash and cash equivalents		(1,168	)		(665	)
Net increase (decrease) in cash and cash equivalents		1,554			(1,278	)
Cash and cash equivalents at beginning of period		258			1,398
Cash and cash equivalents at end of period	$	1,812		$	120
Supplemental disclosure of cash flow information:
Cash paid for interest	$	3,059		$	1,515
Cash paid for income taxes	$	212		$	47
Cash paid for operating leases	$	562		$	797
Non-cash financing activities:
Issuance of common stock from conversion of convertible promissory notes	$	41,209		$	72
Settlement of common stock forward liability in equity	$	135		$	—
Proceeds from issuance of common stock withheld for outstanding payables	$	975		$	—
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$	54		$	1,473

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

6

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

1. Organization and Liquidity

Description of Business

GCT Semiconductor Holding, Inc. (formerly known as Concord Acquisition Corp III) and its wholly owned subsidiaries (collectively “GCT” or the “Company”) is headquartered in San Jose, California with international offices in South Korea, China, Taiwan, and Japan. The Company is a fabless semiconductor company that specializes in the design, manufacturing, and sale of communication semiconductors, including high-speed wireless communication technologies such as 5G/4.75G/4.5G/4G transceivers and modems, which are essential for a wide variety of industrial, B2B and consumer applications.

On March 26, 2024 (the “Closing Date” or “Closing”), Concord Acquisition Corp III (“Concord III”), a Delaware corporation, consummated a series of transactions that resulted in the combination of Gibraltar Merger Sub Inc., a Delaware corporation and a wholly-owned subsidiary of Concord III (“Merger Sub”), and GCT Semiconductor, Inc. ( “Legacy GCT”), pursuant to a Business Combination Agreement, dated November 2, 2023 (as amended, the “Business Combination Agreement”), by and among Concord III, Merger Sub and Legacy GCT. Pursuant to the terms of the Business Combination Agreement, Merger Sub merged with and into Legacy GCT, with Legacy GCT surviving the merger as a wholly-owned subsidiary of Concord III (the “Business Combination”). On the Closing Date, Concord III changed its name from Concord III to “GCT Semiconductor Holding, Inc.”

The Business Combination was accounted for as a reverse recapitalization with Legacy GCT being the accounting acquirer and Concord III identified as the acquired company for accounting purposes. Accordingly, all historical financial information presented in the unaudited condensed consolidated financial statements represent the accounts of Legacy GCT. Subsequent to the Business Combination, the shares and net loss per common share information prior to the Closing have been retroactively restated as shares reflecting the exchange ratio established in the Closing of approximately 0.1868.

Prior to the Business Combination, Concord III’s public shares and public redeemable warrants were listed on the New York Stock Exchange (“NYSE”) under the symbols “CNDB.U,” “CNDB,” and “CNDB.WS,” respectively. On March 27, 2024, the Company’s common stock and public warrants began trading on the NYSE under the symbols “GCTS” and “GCTSW,” respectively. In connection with the Closing, Concord III’s Class A common stock and Class B common stock were recapitalized into a single class of common stock. See Note 3 for additional information.

Liquidity

The accompanying unaudited condensed consolidated financial statements have been prepared assuming the Company will continue as a going concern, which contemplates the realization of assets and liabilities and commitments in the normal course of business. Through September 30, 2024, the Company has incurred operating losses and negative cash flows from operating activities and had an accumulated deficit of $557.1 million as of September 30, 2024. The Company’s existing sources of liquidity as of September 30, 2024 include cash and cash equivalents of $1.8 million. The Company has historically funded operations primarily with issuances of capital stock and the incurrence of debt.

In March 2024, the Company received $17.2 million in cash proceeds from the reverse recapitalization and PIPE Financing (as defined in Note 3), net of transaction costs. In April 2024, the Company executed a common stock purchase agreement (“Purchase Agreement”) with B. Riley Principal Capital II, LLC (“B. Riley”). Pursuant to the Purchase Agreement, the Company has the right, but not the obligation, to sell, from time to time, B. Riley up to $50.0 million worth of shares of the Company’s common stock at its request, at any time prior to June 2026, subject to compliance with the required conditions and limitations. Through September 30, 2024, the Company received $7.8 million in net proceeds under the Purchase Agreement.

Management believes that the available financing under the Purchase Agreement and other capital resources available to the Company, including future sales of products and services, will be sufficient to fund the Company’s operations for at least 12 months after the filing date of this Quarterly Report on Form 10‑Q. To fund its operations over the longer term, the Company will need to start generating positive cash flows, renegotiate its existing debt obligations and raise additional capital through debt or equity financing. There can be no assurance that such additional debt or equity financing will be available on terms acceptable to the Company or at all.

7

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

2. Summary of Significant Accounting Policies and Basis of Presentation

Principles of Consolidation and Basis of Presentation

The unaudited condensed consolidated financial statements and accompanying notes include the accounts of the Company and its wholly owned subsidiaries, after elimination of intercompany balances and transactions. The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the requirements of the Securities and Exchange Commission (“SEC”) for interim financial information. Certain information and disclosures normally included in unaudited consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. Accordingly, these interim unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2023, which are included in the Company’s Form 8‑K filed with the SEC on April 1, 2024. The information as of December 31, 2023 included in the condensed consolidated balance sheets was derived from the audited consolidated financial statements. Certain amounts reported in the audited consolidated financial statements for the year ended December 31, 2023 have been reclassified to conform to the current year’s presentation.

The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments necessary for the fair presentation of the Company’s financial information. The unaudited condensed consolidated results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results to be expected for the year ending December 31, 2024 or for any other future annual or interim period.

Use of Estimates

The preparation of the accompanying unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make judgments, estimates, and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. These judgments, estimates, and assumptions are used for but not limited to revenue recognition, provision for credit losses, deferred income taxes and related valuation allowances, inventory obsolescence, recoverability of long-lived assets, certain accrued expenses, stock-based compensation, determination of the fair value of the Company’s financial instruments, including convertible promissory notes, common stock of Legacy GCT prior to the reverse recapitalization, warrant liabilities, stock options, and common stock forward liability. The Company bases its estimates and judgments on historical experience and on various other assumptions that it believes are reasonable under the circumstances. Actual results could differ from these estimates, and these differences may be material.

Fair Value of Financial Instruments

The carrying amount of certain financial instruments held by the Company, such as cash equivalents, accounts receivable, contract assets and liabilities, accounts payable, and accrued and other current liabilities, approximate fair value due to their short maturities. The carrying amount of the liabilities for the convertible promissory notes and the historical convertible promissory notes (see Note 5) represents their fair value. The carrying amounts of the Company’s bank borrowings and lease liabilities approximate their fair values due to the market interest rates that these obligations bear and interest rates available to the Company.

Fair value is defined as the exchange price that would be received for an asset or an exit price paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy defines a three-level valuation hierarchy for disclosure of fair value measurements as follows:

Level 1	Unadjusted quoted prices in active markets for identical assets or liabilities.
Level 2	Inputs other than quoted prices included within Level 1 that are observable, unadjusted quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the related assets or liabilities.
Level 3	Unobservable inputs that are supported by little or no market activity for the related assets or liabilities.

8

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

A financial instrument's categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s Level 3 financial instruments consist of a common stock forward liability, convertible promissory notes, and warrant liabilities.

Risk and Uncertainties

The Company is subject to certain risks and uncertainties and believes changes in any of the following areas could have a material adverse effect on the Company’s future financial position or results of operations or cash flows: 5G and other new product development, including market receptivity, the ability to satisfy obligations under development agreements with major partners, litigation or claims against the Company based on intellectual property, patent, product regulation or other factors, competition from other products, general economic conditions, the ability to attract and retain qualified employees and ultimately to sustain profitable operations.

The semiconductor industry is characterized by rapid technological change, competition, competitive pricing pressures, and cyclical market patterns. The Company’s financial results are affected by a wide variety of factors, such as general economic conditions specific to the semiconductor industry and the Company’s particular market, the timely implementation of new 5G and other new products, new manufacturing process technologies, and the ability to safeguard patents and intellectual property in a rapidly evolving market. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns. As a result, the Company may experience significant period-to-period fluctuations in unaudited condensed consolidated operating results due to the abovementioned factors.

The Company’s revenue may be impacted by its ability to obtain adequate wafer supplies from foundries and back-end production capacity from the Company’s test and assembly subcontractors. The foundries with which the Company currently has arrangements may not be willing or able to satisfy all of the Company’s manufacturing requirements on a timely basis or at favorable prices. The Company is also subject to the risks of service disruptions, raw material shortages and price increases by its foundries. Such disruptions, shortages and price increases could harm the Company’s consolidated operating results.

Provision for Credit Losses

The provision for credit losses is based on the Company’s assessment of the collectibility of its customer accounts. The Company reviews the provision for credit losses by considering certain factors such as historical experience, industry data, credit quality, age of balances, and current economic conditions that may affect a customer’s ability to pay. Uncollectible receivables are written off when all efforts to collect have been exhausted and recoveries are recognized when they are recovered. The Company determined that provisions for credit losses of approximately $1.1 million and $1.6 million were necessary as of September 30, 2024 and December 31, 2023, respectively.

Concentration of Credit Risk

The Company’s financial instruments subject to credit risk concentration consist of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents primarily with one financial institution located in the United States and another located in South Korea, where amounts deposited may exceed Federal Deposit Insurance Corporation or Korea Deposit Insurance Corporation limits. The Company’s accounts receivable balances are primarily derived from revenues recognized from customers located in the United States, China, South Korea, Japan, and Taiwan. The Company performs ongoing credit evaluations of the financial condition of its customers and distributors and generally does not require collateral.

The Company’s net revenues and accounts receivable are concentrated among a few significant customers, which could expose the Company to financial risk in the event of adverse developments. The following represents the concentration of the Company’s gross accounts receivable among key customers to the extent their share exceeds 10%:

Customer	September 30, 2024			December 31, 2023
Customer A		27	%		—	%
Customer H		20	%		19	%
Customer I		12	%		14	%
Customer J		12	%		27	%
Customer K		—	%		10	%

9

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

The following table includes customers that individually accounted for more than 10% of the Company’s net revenues in the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
Customer	2024			2023			2024			2023
Customer A		—	%		—	%		27	%		—	%
Customer B		24	%		—	%		25	%		—	%
Customer C		—	%		—	%		12	%		—	%
Customer D		—	%		—	%		—	%		25	%
Customer F		—	%		13	%		—	%		13	%
Customer H		57	%		—	%		20	%		—	%
Customer I		—	%		24	%		—	%		—	%
Customer J		—	%		47	%		—	%		20	%

Management closely monitors the creditworthiness and performance of these key customers and has established credit limits and terms to mitigate potential credit risks. The Company also continues diversifying its customer base and exploring opportunities to reduce its reliance on a few major customers.

Foreign Currency

Financial statements of foreign subsidiaries that use the local currency as their functional currency are translated into U.S. dollars at the end-of-period exchange rates or at historical exchange rates for purposes of consolidation. Revenues and expenses are translated using average exchange rates during the reporting period. Translation adjustments are included in accumulated other comprehensive loss within stockholders’ deficit. Gains and losses resulting from transactions denominated in a currency other than the functional currency are included in other income (expenses), net in the unaudited condensed consolidated statements of operations. The Company recognized foreign currency exchange losses of $1.1 million and gains of $0.8 million for the three and nine months ended September 30, 2024, respectively. The Company recognized $0.9 million and $1.8 million of foreign currency exchange gains for the three and nine months ended September 30, 2023, respectively.

Convertible Promissory Notes

The Company has elected the fair value option to account for its outstanding convertible promissory notes. Changes in the estimated fair value of the outstanding convertible promissory notes are recognized in other income (expenses), net in the condensed consolidated statements of operations.

Common Stock Warrants

Common stock warrants are classified as liabilities if they do not meet equity classification requirements based on their settlement mechanism upon a change of control and similar transactions. The corresponding liability is remeasured at fair value while the common stock warrants remain outstanding, with changes in fair value recognized in other income (expenses), net in the unaudited condensed consolidated statements of operations. Common stock warrants that meet equity classification requirements are credited to stockholders’ deficit on their issuance dates and are not subsequently remeasured.

Certain Equity Contracts

The Company’s promises to potentially issue additional shares in the future based on certain market conditions, including the Legacy GCT Earnout Shares and the Sponsor Earnout Shares, are discussed in Note 3. These financial instruments were determined to be equity classified and credited to the stockholders’ deficit upon consummation of the Business Combination.

Emerging Growth Company Status

The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS” Act). Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards using private company timelines. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that it (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition period provided in the JOBS Act. As a result, these unaudited condensed consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

10

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Recent Accounting Pronouncements Adopted

In August 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2020‑06, Debt—Debt with Conversion and Other Options (Subtopic 470‑20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815‑40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”). ASU 2020‑06 reduces the number of accounting models for convertible instruments and allows more contracts to qualify for equity classification. The Company adopted this guidance effective January 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

In October 2021, the FASB issued ASU 2021‑08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (“ASU 2021-08”), which provides an exception to fair value measurement for contract assets and contract liabilities related to revenue contracts acquired in a business combination. ASU 2021-08 requires an acquirer to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. At the acquisition date, an acquirer should account for the related revenue contracts in accordance with Topic 606 as if it had originated the contracts. The Company adopted this guidance effective January 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

In June 2022, the FASB issued ASU 2022‑03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions (“ASU 2022-03”). ASU 2022-03 clarifies that a contractual restriction on the sale of an equity security should not be considered in measuring the fair value of the equity security and cannot be recognized as a separate unit of account. ASU 2022-03 also requires the investor to disclose the fair value of equity securities subject to contractual sale restrictions, the nature and remaining duration of the restrictions, and the circumstances that could cause a lapse in the restrictions. ASU 2022-03 is effective for annual and interim periods beginning after December 15, 2024, with early adoption permitted. The Company retrospectively adopted this guidance effective July 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”), which expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for annual periods beginning after December 15, 2023 and for interim periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the effect of the adoption of ASU 2023-07 on its unaudited condensed consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”), which requires companies to disclose, on an annual basis, specific categories in the effective tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. In addition, companies are required to disclose additional information about income taxes paid. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The standard is required to be adopted on a prospective basis; however, retrospective application is permitted. The Company is currently evaluating the effect of the adoption of ASU 2023-09 on its unaudited condensed consolidated financial statements.

11

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

3. Reverse Recapitalization

In connection with the Business Combination described in Note 1, Concord III completed the acquisition of Legacy GCT and acquired 100% of Legacy GCT’s common stock. Legacy GCT received net proceeds of $17.1 million from the PIPE Financing (as defined below). Concord III incurred total direct transaction costs of $13.1 million, which were expensed by Concord III, and of which $0.9 million related to the PIPE Financing. Legacy GCT incurred transaction costs of $8.9 million, consisting of legal, accounting, and other professional fees, which were recorded as additional paid-in capital. Each share of Legacy GCT capital stock received a deemed value of $10.00 per share after giving effect to the applicable exchange ratio of 0.1868. Upon Closing of the Business Combination, the following occurred:

•Each share of Legacy GCT common stock issued and outstanding prior to the Closing was cancelled and converted into the right to receive a number of shares of the Company common stock at the exchange ratio of 0.1868.

•Each outstanding instrument of Legacy GCT stock options, restricted stock units (“RSUs”), and warrant shares were converted into equivalent Company stock options, RSUs, and warrant shares with the same terms and conditions and at the exchange ratio of 0.1868.

•Certain GCT convertible promissory notes, including the CVT Financing (see Note 7), were automatically converted into the right to receive a number of shares of the Company common stock at the conversion price of $6.67 per share (see Note 7).

Immediately after the Closing, the Company’s outstanding common stock included the following components (in thousands):

	Shares
Common stock of Concord III outstanding prior to the Business Combination		3,941
Less: redemption of Concord III’s common stock		(3,766	)
Sponsor earnout common stock outstanding prior to the Business Combination		8,625
Common stock of Concord III issued and outstanding		8,800
Common stock issued in PIPE Financing		4,530
Legacy GCT common stock		32,503
Total common stock issued and outstanding		45,833

The Business Combination was accounted for as a reverse recapitalization under U.S. GAAP because Legacy GCT was determined to be the accounting acquirer, and Concord III was identified as the accounting acquiree for financial reporting purposes. Accordingly, the consolidated financial statements of the Company represent a continuation of the consolidated financial statements of Legacy GCT, with the Business Combination treated as the equivalent of Legacy GCT issuing its common stock for the net assets of Concord III, accompanied by a recapitalization, and the net assets of Concord III were recorded at historical cost, with no goodwill or other intangible assets recorded. The results of operations prior to the Business Combination are those of Legacy GCT.

Legacy GCT was determined to be the accounting acquirer based the following facts and circumstances:

•Legacy GCT stockholders comprised a relative majority of the voting power of GCT;

•Legacy GCT stockholders had the ability to nominate a majority of the members of the board of directors of GCT;

•Legacy GCT’s operations prior to the Business Combination comprised the only ongoing operations of GCT;

•Legacy GCT’s senior management comprised the senior management of GCT;

•GCT substantially assumed the Legacy GCT name;

•Legacy GCT’s headquarters became GCT’s headquarters; and

•Concord III did not meet the definition of a business.

PIPE Financing

Concurrent with the execution of the Business Combination Agreement, certain investors entered into agreements and committed to purchase in a private placement an aggregate of 4,529,967 shares of the Company’s common stock (the “PIPE Shares”) at a purchase price of $6.67 per share for an aggregate purchase price of $30.2 million (the “PIPE Financing”) upon the Business Combination Closing. The PIPE Financing was consummated immediately prior to the Closing and resulted in net proceeds of $17.1 million to the Company.

Private Placement Warrants and Public Warrants

In November 2021, Concord III issued warrants to purchase shares of Concord III’s common stock that were assumed by the Company at the Closing of the Business Combination on the same terms and conditions: (i) 9,400,000 warrant shares that were issued in a private placement and held by the sponsor and another company (the “Private Placement Warrants”) and (ii) 17,250,000 warrant shares that were issued in connection with the initial public offering of Concord III (the “Public Warrants”).

12

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

The Private Placement Warrants were reallocated at the Closing of the Business Combination as follows: (i) 4,492,650 warrants were vested and retained by the sponsor parties, (ii) 2,087,350 warrants were reallocated from the sponsor parties to certain recipients at Legacy GCT’s discretion to incentivize investment, and (iii) 2,820,000 were forfeited by the sponsor parties.

Subsequent to the Closing, the outstanding Private Placement Warrants and Public Warrants remained liability-classified as the applicable provisions precluding classification in equity did not change as a result of the Business Combination.

Legacy GCT Earnout Shares

At the Closing of the Business Combination, former Legacy GCT stockholders and other investors of Legacy GCT have the right to receive up to 20,000,000 shares of Company common stock (“Legacy GCT Earnout Shares”). The Legacy GCT Earnout Shares may vest between May 2024 and March 2029 if the volume-weighted average price (“VWAP”) of the Company’s common stock for any 20 trading days within 30 consecutive trading day periods exceeds the following amounts per share (“VWAP Threshold”): (i) one-third of the shares based on the $12.50 per share VWAP Threshold, (ii) one-third of the shares based on the $15.00 per share VWAP Threshold, and (iii) one-third of the shares based on the $17.50 per share VWAP Threshold.

In the event of a future transaction that results in a change in control in which shares of the Company common stock are converted into the right to receive cash or other consideration having a value equal to or in excess of a triggering event, then the Legacy GCT Earnout Shares subject to the applicable triggering event that have not been previously issued will be issued to the Legacy GCT stockholders effective as of immediately prior to the consummation of such transaction. In the event of a transaction that results in a change in control in which shares of Company common stock are converted into the right to receive cash or other consideration having a value less than a triggering event, then the Legacy GCT Earnout Shares subject to the applicable triggering event that have not been previously issued will be forfeited.

The Legacy GCT Earnout Shares were recognized at a fair value of approximately $108.8 million upon the Closing and classified within the stockholders’ deficit as they are indexed solely to the Company’s common stock and are otherwise not precluded from equity classification based on their settlement provisions. Under the reverse recapitalization method of accounting, the fair value of the Legacy GCT Earnout Shares was treated as a deemed dividend and, in the absence of retained earnings, credited to additional paid-in capital without any impact on the stockholders’ deficit balances.

Sponsor Earnout Shares

Concurrently with entering into the Business Combination Agreement, the sponsor parties and the Company entered into that certain sponsor support agreement, as amended, modified, or supplemented (the “Sponsor Support Agreement”). Pursuant to the terms of the Sponsor Support Agreement, the sponsor parties have the right to receive up to 1,920,375 shares of the Company's common stock (“Sponsor Earnout Shares”). The Sponsor Earnout Shares are legally outstanding and remain unvested through September 30, 2024. The Sponsor Earnout Shares may vest between September 2024 and March 2029 if the VWAP of the Company’s common stock for any 20 trading days within 30 consecutive trading day periods exceeds the following VWAP Thresholds: (i) one-third of the shares based on the $12.50 per share VWAP Threshold, (ii) one-third of the shares based on the $15.00 per share VWAP Threshold, and (iii) one-third of the shares based on the $17.50 per share VWAP Threshold.

The Sponsor Earnout Shares were recognized at a fair value of approximately $10.4 million upon the Closing and classified within the stockholders’ deficit as they are indexed solely to the Company’s common stock and are otherwise not precluded from equity classification based on their settlement provisions. Under the reverse recapitalization method of accounting, the fair value of the Sponsor Earnout Shares was treated as a deemed dividend and, in the absence of retained earnings, credited to additional paid-in capital without any impact on the stockholders’ deficit balances.

In July 2024, the number of Sponsor Earnout Shares subject to the market-based vesting condition was reduced to 570,796 shares of the Company’s common stock, as the sponsor parties did not meet the required performance condition for the entire grant. The remaining 1,349,579 shares previously included in the outstanding common stock were forfeited. No adjustments to the stockholders' deficit are required upon the forfeiture of the share-based awards that contain market conditions.

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GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

4. Disaggregation of Revenue

All product revenue presented in the condensed consolidated statement of operations is recognized at a point in time, and all service revenue is recognized over time. Net revenues are categorized by customer location as follows (in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2024		2023			2024		2023
South Korea	$	1,500	$	4		$	3,500	$	3,010
United States		837		572			2,565		2,888
Germany		46		353			916		353
China		32		3,567			167		5,133
Other		195		(20	)		195		455
Total	$	2,610	$	4,476		$	7,343	$	11,839

Contract Assets and Liabilities

Net revenues recognized during the nine months ended September 30, 2024 and 2023 for the amounts included in the contract liabilities balance at the beginning of the respective annual periods are less than $0.1 million and $0.7 million, respectively.

As of September 30, 2024 and December 31, 2023, the contract assets were $5.1 million and $3.4 million, respectively. The balances of contract liabilities related to contract fulfillment were $0.5 million and immaterial as of September 30, 2024 and December 31, 2023.

5. Fair Value of Measurements

Recurring Fair Value Measurements

The following financial instruments are measured at fair value on a recurring basis (in thousands):

	September 30, 2024
	Level 1		Level 2		Level 3		Total
Liabilities:
Convertible promissory notes	$	—	$	—	$	8,838		8,838
Warrant liabilities		—		—		3,197		3,197
Common stock forward liability		—		—		451		451

	December 31, 2023
	Level 1		Level 2		Level 3		Total
Liabilities:
Convertible promissory notes	$	—	$	—	$	34,033	$	34,033

14

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Valuation techniques and the inputs

The table below presents valuation techniques and inputs used in the fair value measurement categorized within Level 3 of the fair value hierarchy (in thousands):

	Valuation techniques	Inputs	September 30, 2024		December 31, 2023
Convertible promissory notes, current	Discounted Cash Flow Model (“DCF”)	Discount rate, risk-free rate, credit spread, contractual cash flows	$	4,008	$	—
	PWERM	Scenario of initial public offering (“IPO”) and merger and acquisition (“M&A”)		—		27,794
Common stock forward liability	DCF	Various utilization scenarios, risk-free rate, remaining term		451		—
Convertible promissory notes, net of current	Binomial Lattice Model (“BLM”)	Stock price, volatility, remaining term, risk-free rate, credit spread		4,830		—
	PWERM	Scenario of initial public offering (“IPO”) and merger and acquisition (“M&A”)		—		6,239
Warrant liabilities	Black Scholes Merton Model (“BSM”) or BLM	Exercise price, term to expiration, volatility, risk-free rate		3,197		—

As of September 30, 2024, the key inputs for the convertible promissory notes valuation using the DCF model were as follows: remaining term ranging from 0.08 to 0.25 years and a discount rate of 10.07%. As of September 30, 2024, the key inputs for the convertible promissory notes, net of current, using the BLM were as follows: stock price of $3.35, volatility of 35.5%, remaining term of 1.4 years, risk-free rate of 3.85%, and credit spread of 5.6%.

As of September 30, 2024, the key inputs for the common stock forward valuation using the DCF model were as follows: a remaining term of 1.6 years and future risk-free rate estimates ranging from 3.78 to 4.93% for this period.

As of September 30, 2024, the key inputs for the private placement warrants using the BSM were as follows: exercise price of $11.50 per share, term to expiration of 4.5 years, volatility of 35.5%, and a risk-free rate of 3.55%. As of September 30, 2024, the key inputs for the public warrants using the BLM were as follows: exercise price of $11.50 per share and term to expiration of 4.5 years. As of September 30, 2024, the key inputs for the other warrant liabilities using the BSM were as follows: an exercise price of $10.00 per share, or $18.75 per share, term to expiration ranging from 1.41 years to 2.1 years, volatility ranging from 38.1% to 39.0%, and a risk-free rate ranging from 3.62% to 3.81%.

As of December 31, 2023, the PWERM was used as Legacy GCT was a private company. After the Closing, and as of September 30, 2024, the valuation techniques used reflect that the Business Combination was consummated.

The following table sets forth a summary of the changes in the fair value of the convertible promissory notes (in thousands):

As of December 31, 2023	$	34,033
Conversion		(41,209	)
Borrowing		16,290
Change in fair value		1,203
As of March 31, 2024		10,317
Repayment		(630	)
Change in fair value		(14	)
As of June 30, 2024		9,673
Repayment		(1,000	)
Change in fair value		165
As of September 30, 2024	$	8,838

15

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

The following table sets forth a summary of the changes in the fair value of the warrant liabilities (in thousands):

As of December 31, 2023	$	—
Fair value of warrants assumed at Closing		5,958
Change in fair value		4,626
As of March 31, 2024		10,584
Change in fair value		(6,628	)
As of June 30, 2024		3,956
Change in fair value		(759	)
As of September 30, 2024	$	3,197

The following table sets forth a summary of the changes in the fair value of the common stock forward liability (in thousands):

As of March 31, 2024	$	—
Loss from initial recognition		586
Settlement in equity		(51	)
As of June 30, 2024		535
Settlement in equity		(84	)
As of September 30, 2024	$	451

6. Balance Sheet Components

Inventory

Inventories consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Raw materials	$	1,247	$	448
Work-in-process		504		601
Finished goods		1,359		437
Total inventory	$	3,110	$	1,486

There were no inventory write-downs during the nine months ended September 30, 2024 and 2023.

Prepaid expenses and other assets

Prepaid expenses and other assets consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Prepaid expenses	$	1,372	$	433
Prepaid insurance		566		—
Prepaid research and development		565		—
Prepaid inventory		524		279
Lease deposit		422		434
Other receivables and current assets		96		117
Deferred transaction costs		—		1,643
Total prepaid expenses and other current assets	$	3,545	$	2,906

16

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Accrued and other current liabilities

Accrued and other current liabilities consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Payroll and related expenses	$	9,126	$	9,880
Accrued payables		6,764		6,319
Other taxes payable		3,191		158
Current portion of interest payable		2,560		6,915
Professional fees		548		499
Product warranty liabilities		37		55
Royalty and license fee		43		58
Other		96		72
Total accrued and other current liabilities	$	22,365	$	23,956

7. Debt

The Company’s outstanding debt was as follows (in thousands):

	September 30, 2024					December 31, 2023
	Outstanding Principal		Fair Value			Outstanding Principal		Fair Value
Convertible promissory notes:
Historical convertible promissory notes	$	4,000	$	4,008		$	35,347	$	34,033
2024 convertible promissory note		5,000		4,830			—		—
Total convertible promissory notes		9,000		8,838			35,347		34,033
Borrowings:
KEB Hana Bank		6,820		6,820			6,980		6,980
IBK Industrial Bank		6,972		6,972			7,135		7,135
Note payable (one individual investor)		—		—			1,000		1,000
Mujin Electronics Co., Ltd.		3,789		3,789			—		—
M-Venture Investment, Inc.		—		—			7,756		7,756
Anapass, Inc., related party		9,851		9,851			10,082		10,082
i Best Investment Co., Ltd		4,546		4,546			10,082		10,082
Kyeongho Lee, related party		841		841			1,474		1,474
Total debt	$	41,819		41,657		$	79,856		78,542
Less: current portion				(36,827	)				(72,303	)
Debt, net of current portion			$	4,830				$	6,239

Expected future minimum principal payments under the Company’s total debt is as follows as of September 30, 2024 (in thousands):

Years	Convertible Notes Payable		Borrowings		Total
2024, remainder	$	4,000	$	7,813	$	11,813
2025		—		25,006		25,006
2026		5,000		—		5,000
Total debt	$	9,000	$	32,819	$	41,819

17

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Convertible Promissory Notes

Historical Convertible Promissory Notes

Between 2017 and 2022, the Company issued convertible promissory notes to various investors with maturity dates ranging from October 2020 to April 2025. The annual interest rates varied between 4.0% and 7.0%. In November 2023, the Company entered into an amendment with certain convertible promissory noteholders to modify the conversion terms such that these notes were automatically convertible upon a special purpose acquisition company (“SPAC”) transaction. In March 2024, upon the Closing of the Business Combination, an aggregate principal and interest amount of $32.1 million converted into 4,258,223 shares of common stock at a conversion price of $10.00. In April 2024, the Company repaid one of the convertible promissory notes that was issued in 2021 with a principal amount of $0.6 million. In August and September 2024, the Company repaid one of the convertible promissory notes that was issued in 2017 with a principal amount of $1.0 million. As of September 30, 2024, the remaining principal and interest amount of $5.9 million was outstanding and related to one noteholder where conversion is at the noteholder’s discretion and at a conversion price of $3.50 per share.

2023 and 2024 Convertible Promissory Notes

In November 2023, February 2024 and March 2024, the Company issued convertible promissory notes to certain investors (the “CVT Investors”), pursuant to which the CVT Investors agreed to lend to the Company an aggregate principal amount of $13.3 million. These notes had maturity dates ranging from November 2026 to March 2027, bore an interest rate of 5.0%, and were automatically convertible upon IPO or SPAC transaction. In March 2024, upon the Closing of the Business Combination, an aggregate principal and interest amount of $13.4 million converted into 2,004,535 shares of common stock at a conversion price of $6.67. As of September 30, 2024, none of the notes issued to CVT Investors remain outstanding.

In February 2024, the Company issued a convertible promissory note to a strategic investor for a principal amount of $5.0 million, which matures in February 2026 and bears an interest rate of 5.0% per annum. On or after the earlier of (i) six months from the issuance date of the convertible promissory note and (ii) the Closing of the Business Combination, the noteholder may demand that the Company convert all principal and interest due under the convertible promissory note into shares of Company’s common stock, at a conversion price of $10.00 per share. This note includes customary representations, warranties, and events of default, as well as a covenant relating to the performance of obligations by the Company related to the Company’s 5G activity. As of September 30, 2024, the remaining principal and interest amount of $5.1 million was outstanding.

Borrowings Pursuant to Term Loan and Security Agreements

The amounts in Korean Won (“KRW”) presented below were converted into US dollars based on the applicable historical exchange rates.

KEB Hana Bank

In July 2016, the Company entered into an unsecured term loan agreement with KEB Hana Bank, pursuant to which it borrowed 9.0 billion in KRW ($6.7 million), bearing a variable interest rate (initial annual interest rate of 2.6% and interest ranging between 3.5-5.2% as of June 30, 2024), paid monthly, and maturing in July 2017. The terms of such unsecured term loan agreement have been extended annually for additional one-year terms since 2017, and the maturity date was July 2024. In April 2024, the Company executed an amendment to extend the maturity date to April 2025 for the principal amount of KRW 1.0 billion ($0.7 million) with an interest rate of 3.5%. In July 2024, the Company executed an amendment to extend the maturity date to July 2025 for the principal amount of KRW 8.0 billion ($6.0 million) with an interest rate of 4.9%. Anapass, Inc., a related party, provided certificates of deposit as collateral to KEB Hana Bank to secure the Company’s obligations under this loan (see Note 8).

IBK Industrial Bank

In January 2017, the Company entered into a term loan agreement with IBK Industrial Bank, pursuant to which the Company borrowed KRW 9.2 billion ($6.8 million). The term loan has a maturity date in November 2024 and bears an annual interest rate of 4.9%.

18

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Note Payable (One Individual Investor)

In June 2021, the Company entered into a note payable agreement with an individual investor, pursuant to which the Company borrowed $1.0 million. The note had a maturity date of June 2024 and bears an annual interest rate of 4.0%. In April 2022, the Company entered into an amendment with this one individual investor to remove the conversion right from the note payable. In June 2024, the Company executed an amendment with the individual investor to extend the maturity date from June 2024 to August 2024. In August 2024, the Company repaid this note.

M-Venture Investment, Inc.

In October 2021, the Company entered into a term loan and security agreement with M-Venture Investment, Inc. pursuant to which the Company borrowed KRW 5.0 billion ($3.7 million) and repaid KRW 0.6 billion ($0.4 million) and KRW 0.4 billion ($0.3 million) in 2021 and 2022, respectively, such that KRW 4.0 billion ($3.0 million) remained outstanding. The term loan bears an annual interest rate of 6.5%. In April 2024, the Company executed an amendment with M-Venture Investment, Inc., pursuant to which the Company repaid KRW 2.0 billion ($1.5 million) in April 2024. In May 2024, the Company repaid the term loan in full.

In April 2022, the Company entered into a term loan and security agreement with M-Venture Investment, Inc., pursuant to which the Company borrowed amounts in two draws of KRW 1.0 billion ($0.7 million) and KRW 5.0 billion ($3.7 million), respectively. The term loan had a maturity date in April 2024, and each respective draw bears an annual interest rate of 6.5% and 8.7%. In April 2024, the Company executed an amendment with M-Venture Investment, Inc., pursuant to which the maturity date for both draws were amended. The maturity date for the principal amount of KRW 1.0 billion ($0.7 million) was extended from April 2024 to June 2024. The maturity date for the principal amount of KRW 5.0 billion ($3.7 million) was extended from April 2024 to July 2024. In July 2024, the Company partially repaid the loan of KRW 1.0 billion ($0.7 million) and transferred the remaining balance (“M-Venture Loan”) as further discussed below.

Mujin Electronics Co., Ltd.

In July 2024, the Company executed agreement with M-Venture Investment, Inc. and Mujin Electronics Co., Ltd., in which Mujin Electronics Co., Ltd. fully assumed the remaining M-Venture Loan with the same principal amount of KRW 5.0 billion ($3.7 million). The maturity date of assumed loan is January 2025, with an interest rate of 6.8%.

Anapass, Inc., Related Party

In July 2016, the Company entered into a loan agreement with Anapass, Inc. pursuant to which the Company borrowed KRW 6.0 billion ($4.5 million) in a term loan. Interest only payments are due monthly at 5.5% per annum and the principal amount of the term loan is due on the maturity date of July 2024. In July 2024, the Company and Anapass, Inc. amended the loan agreement to extend the maturity date from July 2024 to July 2025. The loan is collateralized by the Company’s assets as described under the Assets Pledged as Collateral (see Note 8).

In May and September 2022, the Company entered into two term loan agreements with Anapass, Inc. pursuant to which the Company borrowed KRW 3.0 billion ($2.2 million) and KRW 4.0 billion ($3.0 million). The term loans had respective maturity dates in May 2024 and September 2024 and both bear an annual interest rate of 5.5%. In May 2024, the Company executed an amendment with Anapass, Inc., to extend the maturity date from May 2024 to May 2025 for the term loan entered in May 2022. In September 2024, the Company executed an amendment with Anapass, Inc., to extend the maturity date from September 2024 to September 2025 for the term loan entered in September 2022.

i Best Investment Co., Ltd

Between 2022 and 2023, the Company entered into multiple term loans and security agreements with i Best Investment Co., Ltd pursuant to which it borrowed principal amounts in six draws with an aggregate principal balance of KRW 14.0 billion ($10.3 million). All of the term loans had a maturity date in June 2024 and bear an annual interest rate of 6.5%. In June 2024, the Company executed an amendment with the I Best Investment Co., Ltd to extend the maturity date from June 2024 to August 2024 for its first draw, fifth draw and sixth draw. In December 2023, the Company made a $0.8 million repayment of the outstanding principal and interest on its second draw. In March 2024, the Company repaid $2.3 million of the outstanding principal and interest amount of its fourth draw. In June 2024, the Company repaid in full of the term loans with a principal amount of $1.4 million outstanding on its third draw. In July 2024, the Company executed an amendment with i Best Investment Co., Ltd. to extend the maturity date from August 2024 to February 2025 for its first draw, fifth draw and sixth draw.

19

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Kyeongho Lee, Related Party

Between 2017 and 2021, the Company entered into multiple promissory note and term loan agreements with Kyeongho Lee pursuant to which the Company borrowed (a) KRW 500.0 million ($0.4 million), and KRW 500.0 million ($0.4 million) in promissory notes, and (b) KRW 1.0 billion ($0.7 million) and KRW 110.0 million ($0.1 million) in term loans. The promissory notes have a maturity date in November 2024 and bear an annual interest rate varying from 7.5% and 9.0%. In March 2024, the Company repaid to Kyeongho Lee the term loan of KRW 1.0 billion ($0.7 million). The outstanding term loan had a maturity date in May 2024 and bears no interest. In May 2024, the Company executed an amendment with Kyeongho Lee to extend the maturity date from May 2024 to November 2024 for its term loan.

8. Commitments and Contingencies

Litigations

The Company is subject to various claims arising in the ordinary course of business. Although no assurance can be given, the Company believes that it is not a party to any litigation of which the outcome, if determined adversely, would individually, or in the aggregate, be reasonably expected to have a material adverse effect on the business, consolidated operating results, cash flows or financial position of the Company as of September 30, 2024.

Third parties have from time to time claimed, and others may claim in the future, that the Company has infringed their past, current or future intellectual property rights. These claims, whether meritorious or not, could be time-consuming, result in costly litigation, require expensive changes in the Company’s methods of doing business or could require the Company to enter into costly royalty or licensing agreements, if available. As a result, these claims could harm the Company’s business, consolidated operating results, cash flows, and financial position.

Purchase Commitments

The Company has certain commitments for outstanding purchase orders related to the manufacture of certain wafers utilized by the Company and other services that, once the wafers are placed into production, are noncancelable. Otherwise, these production agreements are cancellable at any time with the Company required to pay all costs incurred through the cancellation date. However, the Company does not have a history of cancelling these agreements once production has started. As of September 30, 2024, the Company had outstanding noncancelable purchase commitments for these production agreements of $0.2 million.

Samsung Agreement Liability Release

In July 2020, the Company entered into a research and development agreement with Samsung Electronics Co., Ltd (“Samsung”). According to the agreement, the Company would design 5G chip products and Samsung would provide development and intellectual property support, mass production set up support including mask sets for manufacturing and engineering sample chip supply to the Company for a specific product. The total fee amount for the research and development (“R&D”) services pursuant to the agreement was $21.1 million. The Company bore the risk of R&D failure and was obligated to pay the $21.1 million total fee based on milestones defined in the agreement, of which $11.7 million was due based on development milestones and $9.4 million of additional NRE (“non-recurring engineering”) was to be paid within a maximum of 4 years after the planned product first shipment date. The Company recognized R&D expenses based on an estimate of the percentage completion of services provided by Samsung during the respective financial reporting period. In the first quarter of 2024, Samsung agreed to unconditionally release the Company from payment for work Samsung had completed to date because it had not met certain of the development milestones and due to a change in Samsung’s business strategy. As a result, the Company recognized a gain of $14.6 million upon such unconditional release of its liability to Samsung. During the period ended March 31, 2024, the parties mutually agreed that the agreement had expired and there were no remaining obligations of either party under the agreement.

Alpha Foundry Product Development Agreement

In February 2024, the Company and Alpha Holdings Co., Ltd. (“Alpha”) entered into a foundry product development agreement related to 5G chip development for a total fee of $7.6 million. The Company bears the risk of R&D failure and is obligated to pay the fee based on milestones defined in the agreement. The Company recognizes R&D expenses based on an estimate of the percentage completion of services provided by Alpha during the respective financial reporting period. For the three and nine months ended September 30, 2024, the Company recorded $1.2 million and $6.0 million in R&D expenses related to services provided by Alpha. The aggregate unpaid amount related to this agreement was $4.9 million as of September 30, 2024.

20

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Assets Pledged as Collateral

The Company has provided collateral to Anapass, Inc., a related party (see Note 14), for borrowings from KEB Hana Bank, IBK Industrial Bank and Anapass, Inc. in the amount of $6.8 million, $7.0 million and $9.9 million, respectively, as of September 30, 2024, and $7.0 million, $7.1 million and $10.1 million, respectively, as of December 31, 2023 (see Note 7).

The following table includes a summary of the carrying amounts related to collateral provided to Anapass, Inc. (in thousands):

	September 30,		December 31,
	2024		2023
Cash and cash equivalents	$	1,732	$	254
Accounts receivable		6,447		4,920
Inventory		3,110		1,486
Property and equipment		206		352
Intangible assets and others		884		199

9. Common Stock

B. Riley Purchase Agreement

Pursuant to the Purchase Agreement, the Company has the right, but not the obligation, to sell to B. Riley, from time to time, up to $50.0 million worth of shares of its common stock (“Commitment Amount”), subject to certain limitations and conditions at the Company’s sole discretion. The price per share payable by B. Riley on each trading day represents an amount equal to 98% of the VWAP of the Company’s common stock for the applicable pricing period. The Purchase Agreement requires settlement in registered shares. In May 2024, the Company filed a registration statement on Form S-1 with the SEC, which became effective on June 6, 2024 (“Registration Statement”). The Company may sell shares of its common stock to B. Riley through June 2026 up to the Commitment Amount so long that it remains in compliance with the Purchase Agreement.

The Purchase Agreement was determined to be an equity-linked contract that contains a purchased put option on the Company’s common stock and variable share forward. These freestanding instruments are precluded from equity classification since the Purchase Agreement requires shareholder approval for the issuance of shares in excess of the applicable ownership limitation caps, which is not an input in a fixed-for-fixed option or forward on equity shares.

As of April 2024, the Company determined that the fair value of the put option was nominal due to the short settlement period of one day or less, and the Company recognized a liability of $0.6 million related to the freestanding common stock forward contract. The fair value of the common stock forward liability represents the probability-adjusted present value of the discount to be granted to B. Riley with respect to the sales of its common stock under the Purchase Agreement compared to the VWAP of the company’s common stock for the applicable pricing period.

In connection with the Purchase Agreement, the Company issued 56,818 shares of its common stock (“Commitment Shares”), which included a make-whole provision requiring the Company to reimburse B. Riley in cash if the fair value of these shares is less than $0.25 million. The Company recognized this amount as a liability which remained outstanding as of September 30, 2024 since the Commitment Shares remained unsold by B. Riley.

During the three months ended June 30, 2024, the Company sold an aggregate of 678,462 shares of common stock for $3.3 million, of which $0.5 million was withheld by B. Riley against the outstanding amounts payable, and $2.8 million was received by the Company in cash.

During the three months ended September 30, 2024, the Company sold an aggregate of 1,421,715 shares of common stock for $5.5 million. B. Riley withheld an additional $0.5 million from the aggregate proceeds against the outstanding amounts payable, and $5.0 million was received by the Company in cash.

21

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

Issuance of Common Stock to Underwriter

In April 2024, the Company authorized the issuance of 110,000 shares of its common stock to an underwriter previously involved in activities leading to the Business Combination, contingent on the Registration Statement’s effectiveness. The Company determined that its obligation to issue the underwriter shares met the criteria for equity classifications, and the underlying shares of common stock were issued in June 2024. Based on the timing of approval, the Company recognized $0.7 million in charges to equity and included this amount in general and administrative expenses for the three months ended June 30, 2024.

Private Placement

In September 2024, the Company executed a securities purchase agreement with Anapass, Inc, and issued 741,603 shares of common stock (“Anapass Shares”) and 148,320 equity-classified common stock warrants (“Anapass Warrants”) in exchange for $2.2 million in cash (“Private Placement”). The Company allocated the proceeds based on the relative fair value of the securities issued, including $2.0 million to the Anapass Shares and $0.2 million to the Anapass Warrants. The Anapass Warrants are immediately exercisable at $3.02 per share and will expire five years following the issuance date. Anapass, Inc. remains subject to a lock-up and market stand-off agreement for any shares and share-based instruments issued to it by the Company through March 2025.

Common Stock Reserved for Issuance

Upon the Closing of the Business Combination in March 2024, the Company increased its total number of authorized shares to 440,000,000 shares, consisting of 400,000,000 shares of common stock and 40,000,000 shares of preferred stock. The Company has reserved shares of common stock for issuance as follows (in thousands):

	September 30,		December 31,
	2024		2023
Common stock warrants		26,273		2,894
Legacy GCT Earnout Shares		20,000		—
Shares available for future grant from 2024 plan		3,762		—
Convertible promissory notes		713		1,835
Options issued and outstanding		550		668
Shares available for future grant from 2024 ESPP		600		—
RSUs outstanding		611		392
Shares available for future grant from 2011 plan		—		113
Total		52,509		5,902

10. Warrants

The following table represents a summary of warrants to purchase shares of the Company’s common stock that are outstanding (in thousands, except for exercise price):

Issue Date	September 30, 2024		Exercise Price	Expiration
February 2023 - June 2023		2,115	$10.00 - $18.75	February 2026 – June 2026
July 2023		80	$10.00	July 2026
October 2023		100	$10.00	October 2026
Private and public warrants		23,830	$11.50	March 2029
September 2024		148	$3.02	September 2029
Total		26,273

22

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

11. Stock-Based Compensation

2011 Incentive Compensation Plan

Legacy GCT’s 2011 Incentive Compensation Plan (the “2011 Plan”) permitted the grant of options, stock awards, and RSUs. In connection with the Closing of the Business Combination, the 2011 Plan was terminated, the remaining unallocated shares reserved under the 2011 Plan were cancelled. In March 2024, each award of Legacy GCT stock options and RSUs were converted into equivalent Company stock options and RSUs with the same terms and conditions under the plan described below.

2024 Incentive Compensation Plan

In March 2024, the Company adopted the 2024 Omnibus Incentive Compensation Plan (the “2024 Plan”), under which 3,983,334 shares of common stock were initially reserved for issuance. The 2024 Plan permits the grant of stock options, stock appreciation rights, stock awards, RSUs, dividend equivalent rights, cash awards, and other awards to employees and non-employees, including members of the board of directors, consultants, or advisors.

Stock options outstanding under the 2024 Plan were as follows (in thousands, except per share amounts and years):

	Number of Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Lif (in Years)		Aggregate Intrinsic Value
Balance as of December 31, 2023		3,579		$	0.02		5.5	$	4,045
Reverse recapitalization		(2,911	)		0.09		—		—
Balance as of December 31, 2023(1)		668			0.11		5.5		4,045
Exercised		(118	)		0.11
Balance as of September 30, 2024		550		$	0.11		4.6	$	1,785
Vested and expected to vest as of September 30, 2024		550		$	0.11		4.6	$	1,785
Exercisable as of September 30, 2024		533		$	0.11		4.5	$	1,729

(1)Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (see Note 3).

No options were granted during the nine months ended September 30, 2024. As of September 30, 2024, unrecognized compensation cost related to stock options was nominal. The aggregate intrinsic value of 117,670 options exercised during the three months ended September 30, 2024 was $0.3 million.

Founder Awards to Board of Directors

In 2021, an aggregate of 90,000 shares of common stock were transferred to three members of Concord III’s board of directors (“Founder Shares”). The Founder Shares contained double-trigger vesting, which required continuous service and a liquidity event for any shares to vest. As the required conditions were met upon the Closing, the Company recognized $0.9 million of stock-based compensation upon the Closing in March 2024.

Restricted Stock Units

In December 2023, various employees and directors of Legacy GCT were granted 392,000 RSUs that contain both a performance condition based upon a liquidity event and a service vesting condition such that (subject to the liquidity event condition being satisfied) the RSUs vest in four equal annual installments from the grant date (“2023 RSUs”). The liquidity condition was met upon the Closing.

In June 2024, the Company granted to the members of its board of directors certain share-based awards with a fixed monetary amount of $0.7 million equally allocated among six grantees (“2024 RSUs”). The number of shares issuable to each grantee under the 2024 RSUs is calculated by dividing one-fourth of the allocated fixed monetary amount by the closing price of the Company’s common stock at the end of each fiscal quarter between April 1, 2024 and March 31, 2025. The RSUs will vest on March 31, 2025, subject to the grantees’ continuous service to the Company and will be settled in common stock on various dates in 2026 and 2027. The 2024 RSUs are initially classified as a liability and reclassified to equity up to the monetary amount for which the number of shares to be issued becomes determinable. Through September 30, 2024, this determination was made for 80,916 shares based on the closing price of the Company’s common stock as of each fiscal quarter-end after the grant date.

23

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

In August 2024, the Company granted various employees 140,000 RSUs that vest in four equal annual installments subject to continuous service.

RSUs outstanding under the 2024 Plan were as follows (in thousands, except per share amounts):

	Number of RSUs Outstanding			Weighted Average Grant Date Fair Value
Balance as of December 31, 2023		2,100		$	1.15
Reverse recapitalization		(1,708	)		5.01
Balances as of December 31, 2023(1)		392		$	6.16
Granted		221			3.69
Cancelled		(2	)		6.16
Balance as of September 30, 2024		611		$	5.26

(1)Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (see Note 3).

The Company recognized $0.6 million and $1.2 million of stock-based compensation during the three and nine months ended September 30, 2024, respectively, related to the outstanding RSUs. As of September 30, 2024, there was $2.3 million of unrecognized compensation cost related to RSUs, which is expected to be recognized on a straight-line basis over a weighted average period of 3.0 years. Any unvested RSUs are forfeited upon separation from the Company. Forfeitures are accounted for as they occur.

Stock-Based Compensation

The following table summarizes stock-based compensation included in the Company’s condensed consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
Cost of revenues		33		—		33		—
Research and development		135		1		389		3
Sales and marketing		36		1		108		3
General and administrative		369		1		1,589		2
Total	$	573	$	3	$	2,119	$	8

12. Income Taxes

For financial reporting purposes, the Company’s effective tax rate used for the interim periods is based on the estimated full-year income tax rate. For the three and nine months ended September 30, 2024, the Company’s effective tax rate differs from the statutory rate primarily due to the valuation allowance recorded against the net deferred tax asset balance.

For the nine months ended September 30, 2024 and 2023, the Company recorded income tax of $0.2 million and $0.1 million, respectively. The effective tax rate is (2.6)% and (1.0)% for nine months ended September 30, 2024 and 2023, respectively. Through September 30, 2024, the Company was not under examination by any taxing authority.

As of September 30, 2024 the Company had unrecognized tax benefits of $3.1 million of which $1.7 million would currently affect the Company’s effective tax rate if recognized due to the Company’s deferred tax assets being fully offset by a valuation allowance. The Company does not anticipate that the amount of unrecognized tax benefits relating to tax positions existing as of September 30, 2024 will significantly increase or decrease within the next twelve months. There was no interest expense or penalties related to unrecognized tax benefits recorded as of September 30, 2024.

A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves, as well as the related interest, considering changing facts and circumstances.

24

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

13. Employee Benefit Plans

Under Korean law, the Company is required to make severance payments to Korean employees leaving their employment. The Company’s severance pay liability to its Korean employees, which is a function of the employee’s salary, years of employment, and severance factor, is reflected in the accompanying unaudited condensed consolidated balance sheets as the net defined benefit liabilities on an accrual basis. The net liability for severance payments was as follows (in thousands):

	September 30, 2024			December 31, 2023
Liability for severance payments, gross	$	8,328		$	7,997
Plan assets		(276	)		(308	)
Liability for severance payments, net	$	8,052		$	7,689

14. Related Party Transactions

A summary of balances and transactions with the related parties who are stockholders of the Company were as follows (in thousands):

	September 30, 2024				December 31, 2023
	Anapass		Kyeongho Lee		Anapass		Kyeongho Lee
Borrowings	$	9,851	$	841	$	10,082	$	1,474
Other current liabilities		9		86		212		182

For each of the three and nine months ended September 30, 2024, the Company recorded $0.1 million and $0.4 million, respectively, of interest expense with Anapass, Inc. in the unaudited condensed consolidated statements of operations. For each of the three and nine months ended September 30, 2023, the Company recorded $0.1 million and $0.4 million, respectively, of interest expense with Anapass, Inc. in the unaudited condensed consolidated statements of operations. Interest expense related to the Company’s arrangements with Kyeongho Lee was immaterial during the three and nine months ended September 30, 2024 and 2023.

15. Segments and Information

The Company operates in one segment. Revenue information by geographic region is presented in Note 4 to these unaudited condensed consolidated financial statements. Tangible long-lived assets by geographic region were as follows (in thousands):

	September 30, 2024		December 31, 2023
South Korea	$	1,041	$	1,363
United States		665		930
Total	$	1,706	$	2,293

16. Net Loss Per Share

The following outstanding potentially dilutive common stock equivalents were excluded from the computation of diluted net loss per share for the periods indicated because including them would have been antidilutive (in thousands):

	September 30,
	2024		2023
Warrants		26,273		2,214
Legacy GCT Earnout Shares		20,000		—
Sponsor Earnout Shares		571		—
Convertible promissory notes		713		1,806
Options		550		670
RSU		611		—
Total		48,718		4,690

25

GCT SEMICONDUCTOR HOLDING, INC.

Notes to Unaudited Condensed Consolidated Financial Statements

17. Subsequent Events

Mujin Electronics Co., Ltd.

In October 2024, the Company executed an amendment with Mujin Electronics Co., Ltd. to extend the maturity date of KRW 5.0 billion ($3.7 million) loan from January 2025 to June 2025.

i Best Investment Co., Ltd

In October 2024, the Company executed an amendment with i Best Investment Co., Ltd. to extend the maturity date from February 2025 to May 2025 for its sixth draw.

Historical Convertible Promissory Notes

In October 2024, the Company repaid one of the convertible promissory notes that was issued in 2017 with a principal amount of $1.0 million.

Purchase Agreement

In October 2024, the Company sold 103,596 shares of its common stock for gross proceeds of $0.3 million received by the Company in cash.

Kyeongho Lee, Related Party

In November 2024, the Company entered into a term loan agreement with Kyeongho Lee, a member of the Company’s board of directors, pursuant to which the Company borrowed KRW 4.0 billion ($2.9 million). The loan has a maturity date of December 31, 2024 and bears an annual interest rate of 12.0%.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

On March 26, 2024 (the “Closing Date” or “Closing”), GCT Semiconductor, Inc. (“Legacy GCT”) and Concord Acquisition Corp III, a Delaware corporation (“Concord III”), consummated the Merger pursuant to the Business Combination Agreement and Concord III changed its name to GCT Semiconductor Holding, Inc. (“GCT”). As a result, the financial statements of Legacy GCT are now the financial statements of GCT. This discussion and analysis of our financial condition and results of operations should be read together with our unaudited condensed consolidated financial statements as of and for the three and nine months ended September 30, 2024 and related notes appearing elsewhere in this Quarterly Report and Legacy GCT’s audited consolidated financial statements as of and for the years ended December 31, 2023 and 2022 and related notes included in our Form 8‑K filing with the Securities and Exchange Commission (“SEC”) on April 1, 2024.

This discussion may contain forward-looking statements including, but not limited to, our expectations or predictions of future financial or business performance or conditions. Forward-looking statements are inherently subject to risks, uncertainties, and assumptions. You should read the sections in this Quarterly Report titled “Risk Factors” and “Special Note of Forward-Looking Statements” for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by these forward-looking statements. Unless otherwise indicated, the terms “GCT,” “the Company,” “we,” “us,” or “our” refer to GCT Semiconductor Holding Inc., a Delaware corporation, together with our consolidated subsidiaries.

Overview

We are a fabless semiconductor company that specializes in the design, manufacturing and sale of communication semiconductors, including high-speed wireless communication technologies such as 5G/4.75G/4.5G/4G transceivers (“RF”) and modems, which are essential for a wide variety of industrial, B2B and consumer applications. We have successfully developed and supplied communication semiconductor chipsets and modules to leading wireless operators worldwide, as well as to original design manufacturers (“ODMs”) and original equipment manufacturers (“OEMs”) for portable wireless routers (e.g., Mobile Router/MiFi), indoor and outdoor fixed wireless routers (e.g., CPE), industrial M2M applications and smartphones.

We oversee sales, marketing, and accounting operations from our headquarters in San Jose, California. The Company conducts product design, development, and customer support through our wholly owned subsidiaries located in South Korea, one of which serves as our research and development center. In addition, we utilize separate sales offices for local technical support and sales in Taiwan, China, and Japan.

Our current product portfolio includes RF and modem chipsets based on 4th generation (“4G”), known as Long Term Evolution (“LTE”), technology offering a variety of chipsets differentiated by speed and functionality. These include 4G LTE, 4.5G LTE Advanced (twice the speed of LTE), and 4.75G LTE Advanced-Pro (four times the speed of LTE) chipsets. The Company also develops and sells cellular Internet of Things (“IoT”) chipsets for low-speed mobile networks such as eMTC/NB- IOT/Sigfox, and other network protocols.

Since inception, we have financed our operations primarily through cash receipts from customers, the issuance of convertible promissory notes, borrowings, issuance of capital stock, and the exercise of stock options.

Business Combination

On the Closing Date, Concord III, a Delaware corporation, consummated a series of transactions that resulted in the combination of Gibraltar Merger Sub Inc., a Delaware corporation and a wholly-owned subsidiary of Concord III (“Merger Sub”), and Legacy GCT, pursuant to a Business Combination Agreement, dated November 2, 2023 (the “Business Combination Agreement”), by and among Concord III, Merger Sub and Legacy GCT. Pursuant to the terms of the Business Combination Agreement, Merger Sub merged with and into Legacy GCT, with Legacy GCT surviving the merger as a wholly-owned subsidiary of Concord III (the “Business Combination”). On the Closing Date, Concord III changed its name from Concord III to “GCT Semiconductor Holding, Inc.”

The Business Combination was accounted for as a reverse recapitalization, with Legacy GCT being the accounting acquirer and Concord III being the acquired company for financial reporting purposes. As a result, Legacy GCT’s consolidated financial statements for historical periods will be included in GCT’s future periodic reports filed with the SEC.

The Company received $17.2 million cash proceeds from the Business Combination and private investment from public equity financing (“PIPE Financing”), net of transaction costs. Total direct and incremental transaction costs of Concord III and Legacy GCT were $22.0 million and treated as a reduction of the cash proceeds, of which $8.9 million was deducted from additional paid-in capital for underwriting, accounting, legal and other fees, and the remaining balance of $13.1 million was expensed in the period incurred by Concord III.

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Key Factors Affecting Our Performance

We believe that our future success and financial performance depend on a number of factors that present significant opportunities for our business but also pose risks and challenges, including those in the section titled “Risk Factors” of this Quarterly Report.

Commercial Deployment of 4G LTE and 5G Market

Our business depends upon the continued commercial deployment of 4G and 5G wireless communications equipment, products, and services based on GCT’s technology. Deployment of new networks by wireless carriers requires significant capital expenditures well in advance of any revenue from such networks. If the rate of deployment of new networks by wireless carriers is slower than our expectation, this will reduce the sales of its products and could cause OEMs and ODMs to hold excess inventory. This would harm our revenues and our financial results. The worldwide commercial deployment and adoption of the narrow band LTE variants, Cat M and Cat NB, are expected to expand further the markets for Internet of Things devices. If deployments of the Cat M or Cat NB standards are delayed or if competing standards for Internet of Things devices become favored by wireless carriers, we may not be able to successfully increase sales of our Cat M and Cat NB products, which would harm our revenues and financial results.

Development of New Products

The markets in which we and our customers compete or plan to compete are characterized by rapidly changing technologies, industry standards, and technological obsolescence. Our ability to compete successfully depends on our ability to design, develop, market, and support new products and enhancements on a timely and cost-effective basis. A fundamental shift in technologies in any of our target markets, such as the 5G wireless communications markets, could harm our competitive position within these markets. Our failure to anticipate these shifts, develop new technologies, or react to changes in existing technologies could delay our development of new products, which could result in product obsolescence, decreased revenue, and loss of design wins.

The success of our new products will depend on accurate forecasts of long-term market demand, customer and consumer requirements, and future technological developments, as well as a variety of specific implementation factors, including:

•accurate prediction of the size and growth of the 4G and 5G markets;

•accurate prediction of the growth of the Internet of Things markets and the timing of commercial availability of 4G and 5G networks;

•accurate prediction of changes in device manufacturer requirements, technology, industry standards or consumer expectations, demands, and preferences;

•timely and efficient completion of product design and transfer to manufacturing, assembly and test, and securing sufficient manufacturing capacity to allow us to continue to timely and efficiently deliver products to our customers;

•market acceptance, adequate consumer demand, and commercial production of the products in which our mobile and wireless broadband semiconductor solutions are incorporated;

•the quality, performance, and reliability of the product as compared to competing products and technologies;

•effective marketing, sales, and service; and

•the ability to obtain licenses to use third-party technology to support the development of our products.

If we fail to introduce new products that meet the demands of our customers or our target markets, or if we fail to penetrate new markets, our revenue will likely decrease over time, and our financial condition could suffer.

Semiconductor and Communications Industry

The semiconductor industry has historically exhibited a pattern of cyclicality, which at various times has included significant downturns in customer demand. Cyclical downturns can result in substantial declines in semiconductor demand, production overcapacity, high inventory levels, and accelerated erosion of average selling prices. Such downturns result from a variety of market forces, including constant and rapid technological change, quick product obsolescence, price erosion, evolving standards, short product life cycles, and wide fluctuations in product supply and demand.

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Downturns in the semiconductor industry have been attributed to a variety of factors, including the COVID‑19 pandemic, ongoing trade disputes between the United States and China, weakness in demand and pricing for semiconductors across applications, and excess inventory. In addition, from the end of 2022, the semiconductor industry experienced a downturn due to inventory corrections and reduced consumer demands. These downturns have directly impacted GCT’s business, suppliers, distributors, and end customers. More recently the semiconductor industry has normalized however there have been lingering effects that continue to effect certain segments including that for 4G LTE, where channel inventories continue to exist and where demand has been reduced due to expedited customer transition from 4G LTE to 5G.

Because a significant portion of our expenses are fixed in the near term or are incurred in advance of anticipated sales, we may not be able to reduce our expenses rapidly enough to offset any unanticipated shortfall in revenue. If this situation were to occur, it could adversely affect our operating results, cash flow, and financial condition. In addition, the semiconductor industry has periodically experienced increased demand and production constraints. As a fabless semiconductor company, we rely exclusively on third-party foundries, including certain major semiconductor foundries such as UMC, Alpha and TSMC, for the manufacturing and supplies of its wafers and products. We do not have any formal foundry agreements that guarantee a minimum level of manufacturing capacity. In times of significant increasing demand for capacity, these foundries may experience production shortages and may not allocate sufficient manufacturing capacity to us. If this happens, we may not be able to produce sufficient quantities of our products to meet the increased demand. Any disruption in our supply chain can make it more difficult for us to obtain sufficient wafer, assembly, and test resources from our subcontract manufacturers. Any factor adversely affecting the semiconductor industry in general, or the particular segments of the industry that our products target, may adversely affect our ability to generate revenue and impact our operating results.

In addition, a shortage of manufacturing capacity can also impact the product development strategies of our major customers, which may, in turn, affect our business operations. For example, in 2022, the supply shortage caused our largest customer to change its priority on product development from 4G to the next generation of 5G products, which resulted in the reduction of 4G activity and a decline in demand for our products. Our business is expected to increase again with this customer after the launch of our 5G products.

In the past, the wireless communications industry has experienced pronounced downturns, and these cycles may continue in the future. A future decline in global economic conditions could have adverse, wide-ranging effects on demand for our products and for the products of our customers, particularly wireless communications equipment manufacturers or other members of the wireless industry, such as wireless network operators. Inflation, deflation, and economic recessions that adversely affect the global economy and capital markets also adversely affect our customers and our end consumers. For example, our customers’ ability to purchase or pay for our products and services, obtain financing, and upgrade wireless networks could be adversely affected, which may lead to many networking equipment providers slowing their research and development activities, canceling, or delaying new product development, reducing their inventories, and taking a cautious approach to acquiring our products, which would have a significant negative impact on our business. If this situation were to occur, it could adversely affect our operating results, cash flow, and financial condition. In the future, any of these trends may also cause our operating results to fluctuate significantly from year to year, which may increase the volatility of our stock price.

Public Company Costs

As a result of the Business Combination, we became the successor to an SEC-registered and NYSE-listed company, which requires us to hire additional personnel and implement procedures and processes to address and comply with public company regulatory requirements and customary practices. We have incurred, and expect to continue to incur, additional expenses as a public company including directors’ and officers’ liability insurance premiums, director fees, and additional internal and external accounting, legal and administrative costs.

Key Components of Results of Operations

Net Revenues

The timing of revenue recognition and the amount of revenue recognized in each case depends on various factors, including the specific terms of each arrangement and the nature of the underlying performance obligations. Our net revenues are comprised of product and service revenues.

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Product Revenues

Our product sales are generated from the sale of mobile semiconductor products. Product revenues are recognized at a point in time once control has been transferred to a customer, which is generally at the time of shipment.

Service Revenues

Our service revenues are generated from the sale of mobile semiconductor platform solutions aimed at the 4G LTE and 5G industries, development services, technical advice, and maintenance services. Service revenues are generally recognized over time as the customer obtains control of the promised services.

Cost of Net Revenues

Our cost of net revenues consists of product and service costs. The cost of product net revenues consists of direct and indirect costs related to the manufacturing of our products. Direct costs include wafer costs and costs of assembly and testing performed by third-party contract manufacturers. Indirect costs consist of provisions for excess and obsolete inventory, royalties, allocated overhead for employee costs and facility costs, warranty, and the amortization of our production mask sets and certain intangible assets. Shipping and handling costs incurred for inventory purchases related to the units sold and costs of product shipments are also recorded in the cost of net product revenues. Service costs consist of non-recurring engineering costs for service projects.

Operating Expenses

Research and Development Expenses

Our research and development (“R&D”) expenses consist of costs incurred to develop our products and services. These expenses consist of personnel costs, including salaries, employee benefit costs, and stock-based compensation for employees engaged in R&D activities, software costs, computing costs, hardware and experimental supplies, and expenses for outside engineering consultants. We expense all R&D costs in the periods in which they are incurred.

Sales and Marketing Expenses

Our sales and marketing (“S&M”) expenses consist of employee-related expenses, including salaries, commissions, employee benefits costs, and stock-based compensation for all marketing, sales, and sales support employees. S&M expenses also include local and centralized advertising costs and the infrastructure required to support our marketing efforts. We expense S&M costs in the periods in which they are incurred.

General and Administrative Expenses

Our general and administrative (“G&A”) expenses consist of various components not related to R&D or S&M, such as personnel costs, regulatory fees, costs associated with maintaining and filing intellectual property, meals and entertainment expenses, travel expenses, insurance expenses, and other expenditures related to external professional services including legal, engineering, marketing, human resources, audit, and accounting services. Personnel costs include salaries, benefits, and stock-based compensation. As we continue to grow and expand our workforce and operations, and considering the increased costs associated with operating as a public company, we anticipate that our G&A expenses will increase for the foreseeable future.

Gain on Extinguishment of Liability

Gain on extinguishment of liability relates to the release by a vendor due to a contract termination during the period of amounts payable by us for research and development services received in prior years.

Interest Expense

Interest expense primarily consists of interest and amortization of related debt issuance costs related to our borrowings and convertible promissory notes.

Other Income (Expenses), Net

Other income (expenses), net consists of foreign currency gains and losses, changes in fair value of convertible promissory notes, gains and losses associated with the redemption of convertible notes, and other miscellaneous income and expenses.

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Results of Operations

This section discusses the results of our operations for the periods indicated. The period-to-period comparison of financial results is not necessarily indicative of future results.

For the Three Months Ended September 30, 2024 and 2023

The following table sets forth our historical results for the periods indicated and the changes between periods (in thousands):

	Three Months Ended September 30,
	2024			2023			$ change			% change
Net revenues:
Product	$	1,715		$	4,026		$	(2,311	)		(57	)%
Service		895			450			445			99	%
Total net revenues		2,610			4,476			(1,866	)		(42	)%
Cost of net revenues:
Product		710			3,985			(3,275	)		(82	)%
Service		274			(36	)		310			(861	)%
Total cost of net revenues		984			3,949			(2,965	)		(75	)%
Gross profit		1,626			527			1,099			209	%
Operating expenses:
Research and development		4,210			2,367			1,843			78	%
Sales and marketing		949			744			205			28	%
General and administrative		2,379			1,433			946			66	%
Total operating expenses		7,538			4,544			2,994			66	%
Loss from operations		(5,912	)		(4,017	)		(1,895	)		47	%
Interest expense		(667	)		(1,220	)		553			(45	)%
Other income (expenses), net		(481	)		929			(1,410	)		(152	)%
Loss before provision for income taxes		(7,060	)		(4,308	)		(2,752	)		64	%
Provision for income taxes		61			38			23			61	%
Net loss	$	(7,121	)	$	(4,346	)	$	(2,775	)		64	%

Net Revenues

Net revenues decreased by $1.9 million, or 42%, to $2.6 million for the three months ended September 30, 2024 from $4.5 million for the three months ended September 30, 2023. The decrease was primarily attributable to a decrease of $2.3 million in product sales, partially offset by an increase of $0.4 million in service revenue.

Product sales decreased by $2.3 million from $4.0 million for the three months ended September 30, 2023 to $1.7 million for the three months ended September 30, 2024. The decrease was due to excess LTE channel inventory and our largest customers changing their priorities on product development from 4G to the next generation 5G products during 2023, which resulted in the reduction of 4G activity and decline for demand during the three months ended September 30, 2024. Our net revenues are expected to increase with these customers after the launch of our 5G products.

Service revenues increased by $0.4 million, from $0.5 million for the three months ended September 30, 2023 to $0.9 million for the three months ended September 30, 2024. This increase was due to more significant service projects that were ongoing in the third fiscal quarter of 2024.

Cost of Net Revenues

Cost of net revenues decreased by $3.0 million, or 75%, to $1.0 million for the three months ended September 30, 2024 from $3.9 million for the three months ended September 30, 2023. Product costs decreased by $3.3 million from $4.0 million for the three months ended September 30, 2023 to $0.7 million for the three months ended September 30, 2024. The decrease was primarily driven by a decrease in direct product costs as we sold fewer units. Service costs were $0.3 million for the three months ended September 30, 2024. Service costs were nominal for the three months ended September 30, 2023.

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Our gross margin increased to 62% for the three months ended September 30, 2024 from 12% for the three months ended September 30, 2023 primarily due to changes in the revenue mix. Specifically, we increased the share of reference platform sales and generated higher margins from our service offerings during the third fiscal quarter of 2024.

Research and Development Expenses

Research and development expenses increased by $1.8 million, or 78%, from $2.4 million for the three months ended September 30, 2023 to $4.2 million for the three months ended September 30, 2024. This change was primarily due to a $1.5 million increase in research and development expenses mainly related to professional services provided by Alpha related to the design of 5G chip products.

Sales and Marketing Expenses

Sales and marketing expenses increased by $0.2 million, or 28%, from $0.7 million for the three months ended September 30, 2023 to $0.9 million for the three months ended September 30, 2024. This increase was primarily due to personnel-related costs.

General and Administrative Expenses

General and administrative expenses increased by $0.9 million, or 66%, from $1.4 million for the three months ended September 30, 2023 to $2.4 million for the three months ended September 30, 2024. The change was primarily due to a $0.4 million increase in stock-based compensation related to RSUs, a $0.4 million increase in professional and other expenses related to the public company operations, and a $0.1 million increase in personnel-related costs.

Interest Expense

Interest expense decreased by $0.6 million or 45%, from $1.2 million for the three months ended September 30, 2023 to $0.7 million for the three months ended September 30, 2024. The decrease was primarily due to the conversion of significant amounts of outstanding convertible notes upon the closing of the Business Combination.

Other Income (Expenses), Net

Other expenses, net for the three months ended September 30, 2024 of $0.5 million was primarily from the loss of $1.0 million on foreign currency transactions and $0.2 million loss from the change in fair value of convertible promissory notes, partially offset by a $0.8 million gain on warrants valuation. Other income, net for the three months ended September 30, 2023 of $0.9 million was primarily from gains on foreign currency transactions.

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For the Nine Months Ended September 30, 2024 and 2023

The following table sets forth our historical results for the periods indicated and the changes between periods (in thousands):

	Nine Months Ended September 30,
	2024			2023			$ change			% change
Net revenues:
Product	$	4,111		$	8,667		$	(4,556	)		(53	)%
Service		3,232			3,172			60			2	%
Total net revenues		7,343			11,839			(4,496	)		(38	)%
Cost of net revenues:
Product		1,522			5,954			(4,432	)		(74	)%
Service		1,321			1,006			315			31	%
Total cost of net revenues		2,843			6,960			(4,117	)		(59	)%
Gross profit		4,500			4,879			(379	)		(8	)%
Operating expenses:
Research and development		13,895			7,254			6,641			92	%
Sales and marketing		2,921			2,337			584			25	%
General and administrative		8,075			5,537			2,538			46	%
Gain on extinguishment of liability		(14,636	)		—			(14,636	)		100	%
Total operating expenses		10,255			15,128			(4,873	)		(32	)%
Loss from operations		(5,755	)		(10,249	)		4,494			(44	)%
Interest expense		(3,509	)		(4,878	)		1,369			(28	)%
Other income, net		2,044			2,946			(902	)		(31	)%
Loss before provision for income taxes		(7,220	)		(12,181	)		4,961			(41	)%
Provision for income taxes		187			125			62			50	%
Net loss	$	(7,407	)	$	(12,306	)	$	4,899			(40	)%

Net Revenues

Net revenues decreased by $4.5 million, or 38%, from $11.8 million for the nine months ended September 30, 2023 to $7.3 million for the nine months ended September 30, 2024. The decrease was primarily due to a decrease of $4.6 million in product sales.

Product sales decreased by $4.6 million, or 53%, from $8.7 million for the nine months ended September 30, 2023 to $4.1 million for the nine months ended September 30, 2024. This decrease is driven by a reduction of $4.7 million of LTE product sales partially offset by an increase of $0.1 million in LTE platform sales. This trend was primarily due to excess LTE channel inventory and the changing priorities of our largest customers that shifted their focus to the next generation 5G products. Our net revenues are expected to increase with these customers after we launch our 5G products. Service revenues remained comparable for both the nine months ended September 30, 2024 and 2023.

Cost of Net Revenues

Cost of net revenues decreased by $4.1 million, or 59%, from $7.0 million for the nine months ended September 30, 2023 to $2.8 million for the nine months ended September 30, 2024, driven primarily by the reduction in our product sales. Product costs decreased by $4.4 million, or 74%, from $6.0 million for the nine months ended September 30, 2023 to $1.5 million for the nine months ended September 30, 2024. This decrease in product costs was driven primarily by the reduction in direct product costs as we sold fewer units. Service costs increased by $0.3 million, or 31%, from $1.0 million for the nine months ended September 30, 2023 to $1.3 million for the nine months ended September 30, 2024. This increase in service costs was driven primarily by requirements of our ongoing service projects in 2024.

Our gross margins increased to 61% for the nine months ended September 30, 2024 compared to 41% for the nine months ended September 30, 2023 primarily due to changes in the revenue mix. Specifically, we increased the share of reference platform sales and generated higher margins from our service offerings during the nine months ended September 30, 2024.

Research and Development Expenses

Research and development expenses increased by $6.6 million, or 92% from $7.3 million for the nine months ended September 30, 2023 to $13.9 million for the nine months ended September 30, 2024, primarily in connection with our development projects. This increase

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was primarily due to a $4.2 million increase in research and development expenses mainly related to professional services provided by Alpha related to the design of 5G chip products, a $2.1 million increase in expensed intellectual property costs related to our new 5G chip products, and a $0.4 million increase in stock-based compensation expense, partially offset by a $0.2 million decrease in personnel costs.

Sales and Marketing Expenses

Sales and marketing expenses increased by $0.6 million, or 25%, from $2.3 million for the nine months ended September 30, 2023 to $2.9 million for the nine months ended September 30, 2024. This change was primarily due to increase in personnel related costs.

General and Administrative Expenses

General and administrative expenses increased by $2.5 million, or 46%, from $5.5 million for the nine months ended September 30, 2023 to $8.1 million for the nine months ended September 30, 2024. The change was primarily due to a $1.6 million increase in stock-based compensation related to the vesting of equity awards with performance conditions met upon the closing of the Business Combination and a $0.8 million increase in professional expenses related to the public company operations.

Gain on Extinguishment of Liability

Gain on extinguishment of liability was $14.6 million for the nine months ended September 30, 2024 due to the release by a vendor of amounts payable by us for research and development services received in prior years. There was no similar transaction that took place during the comparable period of 2023.

Interest Expense

Interest expense decreased by $1.4 million, or 28%, from $4.9 million for the nine months ended September 30, 2023 to $3.5 million for the nine months ended September 30, 2024. The decrease of $1.4 million was primarily due to the conversion of significant amounts of outstanding convertible notes upon the closing of the Business Combination.

Other Income, Net

Other income, net for the nine months ended September 30, 2024 of $2.0 million was primarily from the net gain of $2.8 million from fair value remeasurement of our warrants based on the reduction in our stock price during the period then ended, a gain of $1.2 million from foreign currency transactions, partially offset by a net loss of $1.4 million related to the fair value measurement of our convertible promissory notes and a $0.6 million loss from the fair value measurement of our common stock forward liability. Other income, net for the nine months ended September 30, 2023 of $2.9 million was primarily from the fair value measurement of our convertible promissory notes and foreign currency gains.

Non-GAAP Financial Measures

Since inception, we have financed our operations primarily through cash receipts from customers, the issuance of convertible promissory notes, borrowings, issuance of capital stock and the exercise of stock options.

The discussion below includes earnings or losses before interest, taxes, depreciation and amortization (“EBITDA”), Adjusted EBITDA, and Free Cash Flow, as defined below, which are not determined under accounting principles generally accepted in the United States (“non-GAAP financial measures”). Management uses EBITDA, Adjusted EBITDA, and Free Cash Flow for business planning purposes, including managing our business against internally projected results of operations and measuring our performance and liquidity. These supplemental performance measures also provide another basis for comparing period-to-period results by excluding potential differences caused by non-operational and unusual or non-recurring items and may not be comparable to similarly titled measures used by other companies.

Definitions and Limitations

EBITDA represents net loss before interest expense, interest income, income taxes and depreciation and amortization expense. Adjusted EBITDA represents EBITDA adjusted to eliminate stock-based compensation expense included in the results of our continuing operations.

We believe that the use of EBITDA and Adjusted EBITDA eliminates items that have less bearing on our operating performance, thereby highlighting trends in our core business which may not otherwise be apparent. We believe that the exclusion of stock-based compensation expense from Adjusted EBITDA provides a clearer view of the operating performance of our business and is appropriate given that grants made at a certain price and point in time do not necessarily reflect how our business is performing at any particular

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time. We also present Adjusted EBITDA as a supplemental performance measure because we believe that this measure provides investors, securities analysts and other users of our consolidated financial statements with important supplemental information with which to evaluate our performance and to enable them to assess our performance on the same basis as management.

Free Cash Flow represents net cash provided by operating activities, less purchases of property and equipment.

We believe that Free Cash Flow provides meaningful information regarding our liquidity. Management believes that Free Cash Flow is useful for investors because it provides them with an important perspective on the cash available for strategic measures, after making necessary capital investments in property and equipment to support the Company’s ongoing business operations and provides them with the same measures that management uses as the basis of making capital allocation decisions.

These supplemental performance measures may vary from and may not be comparable to similarly titled measures used by other companies, including companies in the semiconductor industry. EBITDA, Adjusted EBITDA and Free Cash Flow are not recognized measurements under GAAP. When analyzing our performance with these three non-GAAP metrics, investors should (i) evaluate each adjustment in our reconciliation to the corresponding GAAP measure, and the explanatory footnotes regarding those adjustments, (ii) use EBITDA or Adjusted EBITDA in addition to, and not as an alternative to, net income attributable to common stock as a measure of operating results and (iii) use Free Cash Flow in addition to, and not as an alternative to, consolidated net cash provided by operating activities when evaluating our liquidity.

Adjusted EBITDA and Free Cash Flow have limitations as analytical tools, and users should not consider them in isolation or as substitutes for analysis of our results as reported under GAAP. These metrics should not be viewed as substitutes for, or superior to, net loss or net cash used in operating activities reported in accordance with GAAP as measures of profitability or liquidity. Some of these limitations include the following:

•EBITDA does not reflect interest income or expense, cash requirements for our income taxes, depreciation and amortization, which are significant and unavoidable operating costs given the level of capital expenditures needed to maintain our business, changes in, or cash requirements for, our working capital needs.

•Adjusted EBITDA does not consider or does not take into account the same indicators as EBITDA and the potentially dilutive impact of stock-based compensation.

•Free Cash Flow does not represent the total residual cash flow available for discretionary purposes because it does not reflect our contractual commitments or obligations.

•Other companies, including those in our industry, may calculate EBITDA, Adjusted EBITDA and Free Cash Flow differently, which reduces their usefulness as comparative measures.

Because of these limitations, investors consideration should include EBITDA, Adjusted EBITDA, and Free Cash Flow alongside other financial performance measures, including net loss, net cash used in operating activities, and our other GAAP results.

Reconciliation to GAAP Measures

The following is a reconciliation of net loss to EBITDA and Adjusted EBITDA for the periods presented (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2024			2023			2024			2023
Net loss	$	(7,121	)	$	(4,346	)	$	(7,407	)	$	(12,306	)
Provision for income taxes		61			38			187			125
Interest expense		667			1,220			3,509			4,878
Depreciation and amortization		149			264			528			654
EBITDA		(6,244	)		(2,824	)		(3,183	)		(6,649	)
Stock-based compensation		573			3			2,119			8
Adjusted EBITDA	$	(5,671	)	$	(2,821	)	$	(1,064	)	$	(6,641	)

The following is a reconciliation of net cash used in operating activities to free cash flow for the periods presented (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2024			2023			2024			2023
Net cash used in operating activities	$	(4,627	)	$	(1,549	)	$	(28,689	)	$	(7,920	)
Purchases of property and equipment		(54	)		(62	)		(185	)		(284	)
Free cash flow	$	(4,681	)	$	(1,611	)	$	(28,874	)	$	(8,204	)

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Liquidity and Capital Resources

Since inception, we have financed our operations primarily through cash receipts from customers, the issuance of convertible promissory notes, borrowings, issuance of capital stock and the exercise of stock options.

With limited exceptions, we have incurred and expect that we will continue to incur significant operating losses. For the three and nine months ended September 30, 2024, we had a net loss of $7.1 million and $7.4 million, respectively. For the nine months ended September 30, 2024 and 2023, we had cash used in operating activities of $28.7 million and $7.9 million, respectively. As of September 30, 2024, we had an accumulated deficit of $557.1 million. Our unaudited condensed consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classification of liabilities that might be necessary if we are unable to obtain adequate financing in the future.

In March 2024, we received $17.2 million in cash proceeds from the reverse recapitalization and PIPE Financing, net of transaction costs in connection with the closing of the Business Combination. As a result of the cash proceeds received in connection with the Business Combination and other capital resources available to us, including sales of our products and services and the Purchase Agreement discussed below, we believe we have sufficient cash to fund our operations for at least the next 12 months from the filing of this Quarterly Report on Form 10-Q.

In April 2024, we entered into a common stock purchase agreement (the “Purchase Agreement”) and a related registration rights agreement (the “Registration Rights Agreement”) with B. Riley Principal Capital II, LLC (“B. Riley”). Pursuant to the Purchase Agreement, we have the right but not the obligation, to sell, from time to time, to B. Riley up to $50.0 million in aggregate gross purchase price of shares of our common stock in our sole discretion, subject to certain conditions and limitations, during the term of 24 months. Pursuant to the Registration Rights Agreement, the Company filed a registration statement on Form S-1 to register the resale of shares of common stock to be sold to B. Riley, which became effective on June 6, 2024. Through September 30, 2024, we sold an aggregate of 2,100,177 shares of our common stock for $8.8 million under the Purchase Agreement and received cash proceeds of $7.8 million, which included $1.0 million that was withheld by B. Riley against the outstanding amounts payable. In addition, in October 2024 we sold 103,596 shares of our common stock under the Purchase Agreement and received cash proceeds of $0.3 million.

As of September 30, 2024, we have outstanding convertible promissory notes and borrowings with a total principal amount of $41.8 million, of which $36.8 million is contractually due within 12 months from this reporting date. During July and October 2024, we were able to renegotiate the timing of payments for some of the obligations that initially were due in the third fiscal quarter of 2024 and first fiscal quarter of 2025. However, our existing debt obligations largely remain due within one year from September 30, 2024. In November 2024, we entered into a term loan agreement with Kyeongho Lee pursuant to which the Company borrowed $2.9 million maturing in December 2024. We will need to start generating positive cash flows, renegotiate our existing debt obligations and raise additional capital through debt or equity financing. There can be no assurance that such additional debt or equity financing will be available on terms acceptable to us or at all.

While a portion of the cash proceeds received in connection with the Business Combination was expended to support our 5G activity and fund other operational expenses, we expect that further and significant ongoing operating expenditures will be necessary to successfully implement our business plan and market our products. With the start of manufacturing, shipments and commercialization of our first 5G chipset expected during the first half of 2025, we anticipate significant related expenditures in the form of production-related costs, including mask sets, wafers, and design service fees, and most such costs will be incurred prior to the commencement of manufacturing and production. If we do not have sufficient funds to make such payments, or if we cannot extend the terms of our existing commercial loans or to raise additional capital, the payments can be delayed, which may adversely affect our business operations and financial performance. For a more detailed description of such risks, please see the section entitled “Risk Factors” disclosed in our Registration Statement on Form S-1 filed with the SEC on May 22, 2024.

We intend to mitigate the risk of any working capital deficit by continuing to seek and execute appropriate actions to secure funding as a publicly traded company, including extension and refinancing of existing loans, executing public or private equity offerings, debt financings, and other means. We have historically been able to raise capital through the issuance and sale of equity and equity-linked instruments, such as redeemable convertible preferred stock, convertible promissory notes, and borrowings, although no assurance can be provided that we would continue to be successful in doing so in the future.

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We expect to use such additional liquidity and the cash and cash equivalents available to us after the Closing to finance the following activities:

•Cost of mass production of 5G and other products, including masks, wafers and design house fees;

•Acquisition of IP and tool enhancement to develop next generation of product;

•Hiring of additional personnel in engineering and sales and marketing functions; and

•Improvement of engineering equipment.

While we believe that we have a reasonable basis for our expectation and we will be available to raise additional funds, we cannot provide assurance that we will be able to complete additional financing in a timely manner. In addition, the sale of additional equity securities could result in dilution to our stockholders. The incurrence of indebtedness would result in increased debt service obligations and may include operating and financial covenants that would restrict our operations. We cannot be certain that any financing will be available in the amounts we need or on terms acceptable to us, if at all. Should we enter into definitive collaboration and/or joint venture agreements or engage in business combinations in the future, we may be required to seek additional financing.

Cash flow Comparison for the Nine Months Ended September 30, 2024 and 2023

The following table summarizes our cash flows for the periods indicated (in thousands):

	Nine Months Ended September 30,
	2024			2023
Net cash used in operating activities	$	(28,689	)	$	(7,920	)
Net cash used in investing activities		(185	)		(284	)
Net cash provided by financing activities		31,596			7,591
Effect of exchange rate changes on cash and cash equivalents		(1,168	)		(665	)
Net increase (decrease) in cash and cash equivalents	$	1,554		$	(1,278	)

Operating Activities

Cash used in operating activities of $28.7 million during the nine months ended September 30, 2024 was primarily attributable to our net loss of $7.4 million, non-cash adjustments of $12.2 million, and a net change in our operating assets and liabilities of $9.1 million. Non-cash adjustments consisted primarily of a $14.6 million gain from the extinguishment of liability, a $2.8 million gain from the change in fair value of warrant liabilities, a $0.5 million decrease in provision for credit loss, partially offset by $2.1 million in stock-based compensation, a $1.4 million loss from the change in fair value of convertible promissory notes, $0.7 million in non-cash expense related to the issuance of common stock to an underwriter, $0.5 million in depreciation and amortization charges, and a $0.5 million in operating lease right-of-use amortization. The change in our operating assets and liabilities of $9.1 million primarily resulted from a decrease of $3.0 million in accrued and other current liabilities due to the payment of costs incurred related to our Business Combination, a decrease of $2.3 million in accounts payable, an increase of $1.7 million in contract assets, an increase of $1.6 million in inventory, an increase or $0.9 million in accounts receivable, a decrease of $0.5 million in lease liabilities, and a decrease of $0.3 million in other liabilities, partially offset by an increase of $0.7 million in net defined benefit liabilities, an increase of $0.5 million in contract lease liabilities, and a decrease of $0.1 million in other assets.

Cash used in operating activities of $7.9 million during the nine months ended September 30, 2023 was primarily attributable to our net loss of $12.3 million, partially offset by $0.9 million in non-cash adjustments and $3.5 million change in our operating assets and liabilities. Non-cash adjustments consisted primarily of a $0.8 million increase in credit loss allowance, $0.7 million in depreciation and amortization charges, and $0.6 million in operating lease right-of-use amortization, partially offset by $1.1 million gain from the change in fair value of convertible promissory notes. The change in our operating assets and liabilities of $3.5 million primarily resulted from an increase of $7.4 million in our accrued and other current liabilities related to the timing of payments, a decrease of $1.8 million in inventory, a decrease of $0.8 million in prepaid expenses and other current assets, and a decrease of $0.1 million in other assets, partially offset by an increase of $3.3 million in accounts receivable, an increase of $2.0 million in in contract assets due to unbilled services provided under certain projects, a decrease of $0.8 million in lease liabilities and an decrease of $0.7 million in accounts payable and a decrease of $0.1 million in income tax payable.

Investing Activities

Cash used in investing activities during the nine months ended September 30, 2024 and 2023 was related solely to the purchases of property and equipment.

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Financing Activities

Cash provided by financing activities of $31.6 million during the nine months ended September 30, 2024 consisted of $17.2 million from proceeds received from the reverse recapitalization and PIPE Financing, net of transaction costs, $16.3 million in proceeds from the issuance of convertible promissory notes, $7.8 million proceeds received from issuance of common stock to B. Riley under the Purchase Agreement, $3.7 million in proceeds from borrowings, and $2.2 million proceeds received from issuance of common stock in a private placement, partially offset by $14.1 million in repayment of our borrowings and $1.6 million repayment of convertible promissory notes.

Cash provided by financing activities of $7.6 million during the nine months ended September 30, 2023 primarily related to net proceeds from bank borrowings.

Commitments and Contractual Obligations

We have material commitments and contractual obligations, including leases, purchase commitments, and research and development agreements. We have various operating leases, under which we lease office equipment and office space. The operating leases have various expiration dates through 2026.

We have certain commitments for outstanding purchase orders related to the manufacture of certain wafers utilized by the Company and other services, and we have entered into a material research and development agreement. See Note 8 to our unaudited condensed consolidated financial statements included in this Form 10-Q for more information regarding our additional commitments and contractual obligations.

We have certain debt agreements in place related to convertible promissory notes and borrowings. See Note 7, to our unaudited condensed consolidated financial statements included in this Form 10-Q for more information regarding our debt arrangements.

Critical Accounting Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our unaudited condensed consolidated financial statements, which are prepared in accordance with accounting principles generally accepted in the United States of America. The preparation of our unaudited condensed consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts and related disclosures. We base our estimates on historical experience and various other factors that we believe to be reasonable under the circumstances, which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions due to the inherent uncertainty involved in making those estimates, and any such differences may be material.

There have been no material changes to our critical accounting estimates from those described in “Management’s Discussion and Analysis of Financial Condition,” “Results of Operations – Critical Accounting Policies and Significant Judgments and Estimates” disclosed in our Form 8-K filing with the SEC on April 1, 2024, except that from the Closing we have certain contracts in our own equity that are subject to liability classification and remeasurement each reporting periods.

Revenue Recognition

Our revenues are generated by the sale of mobile semiconductor solutions consisting of products and platform solutions aimed at the LTE and 5G industries, development services, and technical advice and maintenance services.

The timing of revenue recognition and the amount of revenue recognized in each case depends on various factors, including the specific terms of each arrangement and the nature of the underlying performance obligations. Revenues from sales of our products are recognized upon transfer of control to the customer, which is generally at the time of shipment. Service revenues from development services, technical advice, and maintenance services are generally recognized over time as these performance obligations are satisfied.

We make estimates of potential future returns and sales allowances related to current period product revenue. We analyze historical return rates and changes in customer demand when evaluating the adequacy of returns and sales allowances. Although we believe we have a reasonable basis for our estimates, such estimates may differ from actual returns and sales allowances. These differences may materially impact reported net product revenues and amounts ultimately collected on accounts receivable.

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Provision for Credit Losses

Accounts receivable balances are primarily derived from revenues earned from customers located in the United States, China, South Korea, Japan, and Taiwan. We perform ongoing credit evaluations of the financial conditions of our customers and distributors, and generally do not require collateral from our customers. We continuously monitor collections and payments from customers and maintain a provision for credit losses based upon the collectibility of our customer accounts. We review the provision by considering certain factors such as historical experience, industry data, credit quality, age of balances and current economic conditions that may affect a customer’s ability to pay. Uncollectible receivables are written off when all efforts to collect have been exhausted and recoveries are recognized when they are recovered. We cannot guarantee that we will continue to experience the same credit loss rates that we had in the past. A significant change in the liquidity or financial position of any of our significant customers could have a material adverse effect on the collectibility of our accounts receivable and our future operating results. The provision for credit losses was $1.1 million and $1.6 million as of September 30, 2024 and December 31, 2023, respectively.

Fair Value of Convertible Promissory Notes

We have made an election to account for our convertible promissory notes under the fair value option, the convertible promissory notes are recorded at their initial fair value on the date of issuance and then are adjusted to fair value upon any modification and at each balance sheet date thereafter. Changes in the estimated fair value of the convertible promissory notes are recognized as non-cash gains or losses in the unaudited condensed consolidated statements of operations within other income (expenses), net.

Our convertible promissory notes are valued using a discounted cash flow (“DCF”) model or binomial lattice model (“BLM”), and, prior to the Business Combination, were valued using a combination of an option pricing model and Probability-Weighted Expected Return Method (“PWERM”), which are a Level 3 fair value measurements. Significant assumptions used in the DCF include the remaining term and discount rate. Significant assumptions used in the BLM include volatility, remaining term, risk-free rate, and credit spread. The PWERM is a scenario-based methodology that estimates the fair value based using an analysis of future values for the Company that assumes various outcomes. The value is based on the probability-weighted present value of expected future investment returns considering each of the possible outcomes available. The future value under each outcome is discounted back to the valuation date at an appropriate risk-adjusted discount rate and probability-weighted to arrive at an indication of value. Significant assumptions used in the PWERM include volatility, discount rate, and the probability of a future liquidity event.

Contracts in Own Equity – Fair Value of Warrants

We classify contracts in equity, including warrants to purchase shares of the Company’s common stock, that do not meet the indexation guidance as liabilities. At the end of each reporting period, these liability-classified instruments are remeasured using an option pricing model or BLM. Significant assumptions are used in determining the fair value of our warrants and include volatility and the risk-free rate.

Recent Accounting Pronouncements

See Note 2 to our unaudited condensed consolidated financial statements included herein for more information about recent accounting pronouncements, the timing of their adoption, and our assessment, to the extent we have made one yet, of their potential impact on our financial condition and results of operations.

JOBS Act Accounting and Smaller Reporting Company Elections

We are an “emerging growth company,” as defined in the JOBS Act. Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act until those standards apply to private companies.

We have elected to use this extended transition period for complying with certain new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, our unaudited condensed consolidated financial statements may or may not be comparable to companies that comply with new or revised accounting pronouncements as of public companies’ effective dates.

We are also a “smaller reporting company,” as defined in the Exchange Act. We may continue to be a smaller reporting company even after we are no longer an emerging growth company.

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We have elected to take advantage of certain of the scaled disclosures available to smaller reporting companies, and will be able to take advantage of these scaled disclosures for so long as the market value of our voting and non-voting common stock held by non-affiliates is less than $250.0 million measured on the last business day of our second fiscal quarter, or our annual revenue is less than $100.0 million during the most recently completed fiscal year and the market value of our voting and non-voting common stock held by non- affiliates is less than $700.0 million measured on the last business day of our second fiscal quarter.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

We are a smaller reporting company, as defined by Rule 12b‑2 under the Securities and Exchange Act of 1934, as amended (the Exchange Act) and in Item 10(f)(1) of Regulation S-K and are not required to provide the information under this item.

Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

As of September 30, 2024, management, with the participation and supervision of our Chief Executive Officer and our Chief Financial Officer, have evaluated our disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act. Based on that evaluation, our Chief Executive Officer and our Chief Financial Officer have concluded that, as of September 30, 2024, our disclosure controls and procedures were effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the three months ended September 30, 2024, that have materially affected, or are reasonably likely to materially affect, our internal control financial reporting.

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PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

We are not currently a party to any material legal proceedings. From time to time, we may, however, in the ordinary course of business become involved in legal proceedings. Regardless of outcome, litigation could have a material adverse effect on us due to defense and settlement costs, diversion of management resources, negative publicity, reputational harm and other factors, and there can be no assurances that favorable outcomes will be obtained.

ITEM 1A. Risk Factors.

Other than the risk factors discussed under this section, there have been no material changes to the risk factors we previously disclosed in our Registration Statement on Form S‑1 filed with the SEC on May 22, 2024. Our operations could also be affected by additional factors that are not presently known to us or by factors that we currently consider immaterial to our business.

We have a history of losses, and we may not achieve or sustain profitability in the future, on a quarterly or annual basis.

We began operations in 1998 and have incurred losses on an annual basis since inception. We have incurred and will continue to incur significant operating losses. For the years ended December 31, 2023 and 2022, we had a net loss of $22.5 million and $26.4 million, respectively, and used cash in operating activities of $8.8 million and $18.1 million, respectively. For the nine months ended September 30, 2024, we had a net loss of $7.4 million, and used cash in operating activities of $28.7 million. As of September 30, 2024, we had an accumulated deficit of $557.1 million and negative working capital of approximately $41.9 million. We had short-term debt, including convertible promissory notes and borrowings, in the amount of $36.8 million as of September 30, 2024. As of December 31, 2023 , we had an accumulated deficit of $549.7 million and negative working capital of approximately $101.8 million. We had short-term debt in the amount of $72.3 million, including convertible promissory notes and borrowings as of December 31, 2023. We expect to incur significant expenses related to the research and development of our products and expansion of our business. Furthermore, the rapidly evolving wireless communications markets in which we sell our products, as well as other factors, make it difficult for us to forecast quarterly and annual revenue accurately. As a result, we could experience cash flow management problems, unexpected fluctuations in our results of operations and other difficulties, any of which would make it difficult for us to meet our debt obligations and achieve and maintain profitability.

Our condensed consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classification of liabilities that might be necessary if we are unable to obtain adequate financing in the future. Accordingly, if we do not generate sufficient level of revenue or become profitable, we will be required to seek other sources of funding, such as issuance of equity or debt securities to raise capital. Any such financings may not be accessible on acceptable terms, if at all. The failure to raise additional capital or otherwise obtain funding for our operation will have a material adverse effect on our business, results of operations and financial position.

Our indebtedness could adversely affect our operations, including our ability to perform our obligations and fund working capital.

As of September 30, 2024, we have outstanding convertible promissory notes and borrowings with a total principal amount of $41.8 million, of which $36.8 million is contractually due within 12 months from the reporting date. We may also incur substantial additional indebtedness. Our indebtedness could have important consequences, including the following:

•we may be unsuccessful in refinancing our existing indebtedness on a long-term basis;

•we could have difficulty satisfying our debt obligations, and if we fail to comply with these requirements, an event of default could result;

•we may be required to dedicate a substantial portion of our cash flow from operations to required payments on indebtedness, thereby reducing the cash flow available to fund 5G and other product development, working capital, capital expenditures and other general corporate activities;

•in order to manage our debt and cash flows, we may increase our short-term indebtedness and decrease our long-term indebtedness which may not achieve the desired results;

•covenants relating to our indebtedness may limit our ability to obtain additional financing for working capital, capital expenditures and other general corporate activities, which may limit our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate;

•we may be more vulnerable to general adverse economic and industry conditions;

•we may be placed at a competitive disadvantage compared to our competitors with less debt; and

•we may have difficulty repaying or refinancing our obligations under our senior credit facilities on their respective maturity dates.

41

If any of these consequences occur, our financial condition, results of operations and ability to pay dividends could be adversely affected. This, in turn, could negatively affect the market price of our Common Stock, and we may need to undertake alternative financing plans, such as refinancing or restructuring our debt, selling assets, reducing or delaying capital investments or seeking to raise additional capital. We cannot assure that any refinancing would be possible, that any assets could be sold, or, if sold, of the timing of the sales and the amount of proceeds that may be realized from those sales, or that additional financing could be obtained on acceptable terms, if at all. In addition, while we were able to negotiate with our lenders of commercial loans to extend the maturity dates or modify payment schedules, there is no guarantee that we will be successful in negotiating such terms in the future, and failure to do so may result in defaults under the loans, which will have an adverse effect on our financial conditions and results of operations.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

None.

Item 3. Defaults Upon Senior Securities.

Not applicable.

Item 4. Mine Safety Disclosures.

Not applicable.

Item 5. Other Information.

On November 11, 2024, the Company entered into a term loan agreement with Dr. Kyeongho Lee, Chairman of the Company’s board of directors, pursuant to which the Company borrowed KRW 4.0 billion ($2.9 million) from Dr. Lee. The loan has a maturity date of December 31, 2024 and bears an annual interest rate of 12.0%.

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ITEM 6. Exhibits.

	Exhibit Index
Exhibit No.	Description
4.1†	Warrant to Purchase Common Stock of GCT Semiconductor Holding, Inc., issued September 26, 2024. (incorporated by reference to Exhibit 4.1 to the Registrant’s Current Report on Form 8‑K, filed with the SEC on September 26, 2024).
10.1	Common Stock Purchase Agreement, dated April 23, 2024 by and between GCT Semiconductor Holding, Inc. and B. Riley Principal Capital II, LLC (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8‑K, filed with the SEC on April 24, 2024).
10.2	Amendment No 1 to Common Stock Purchase Agreement, dated May 21, 2024, by and between GCT Semiconductor Holding, Inc. and B. Riley Principal Capital II, LLC (incorporated by reference to Exhibit 10.25 to the Registrant’s Registration Statement on Form S-1 filed with the SEC on May 22, 2024).
10.3	Registration Rights Agreement, dated April 23, 2024 by and between GCT Semiconductor Holding, Inc. and B. Riley Principal Capital II, LLC (incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8‑K, filed with the SEC on April 24, 2024).
31.1*	Certification of the Principal Executive Officer pursuant to Rule 13a‑14(a) and Rule 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 the Principal Financial Officer pursuant to Rule 13a‑14(a) and Rule 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 the Principal Executive Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2*	Certification of the Principal Financial Officer pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	Inline XBRL Instance Document-the instance document does not appear in the Interactive Data File as its XBRL tags are embedded within the Inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document With Embedded Linkbase Documents.
104	Cover Page formatted as Inline XBRL and contained in Exhibit 101

* Filed herewith

† Certain of the exhibits and schedules to this Exhibit have been omitted in accordance with Regulation S-K Item 601(a)(5). The Registrant agrees to furnish a copy of all omitted exhibits and schedules to the SEC upon its request.

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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.

	GCT Semiconductor Holding, Inc.
Date: November 14, 2024	By:	/s/ John Schlaefer
	Name:	John Schlaefer
	Title:	Chief Executive Officer

	GCT Semiconductor Holding, Inc.
Date: November 14, 2024	By:	/s/ Edmond Cheng
	Name:	Edmond Cheng
	Title:	Chief Financial Officer

44

EX-31.1

EXHIBIT 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, John Schlaefer, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of GCT Semiconductor Holding, Inc.;

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 (the registrant’s fourth fiscal quarter in the case of an annual report) 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 registrant’s board of directors (or persons performing the equivalent function):

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.

Dated: November 14, 2024

/s/ John Schlaefer

John Schlaefer

Chief Executive Officer

(Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Edmond Cheng, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of GCT Semiconductor Holding, Inc.;

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 (the registrant’s fourth fiscal quarter in the case of an annual report) 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 registrant’s board of directors (or persons performing the equivalent function):

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.

Dated: November 14, 2024

/s/ Edmond Cheng

Edmond Cheng

Chief Financial Officer

(Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, John Schlaefer, Chief Executive Officer of GCT Semiconductor Holding, Inc. (the “Company”), certify that:

1. the Quarterly Report on Form 10-Q of the Company for the three months ended September 30, 2024 as filed with the Securities and Exchange Commission (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.

Dated: November 14, 2024

/s/ John Schlaefer

John Schlaefer

Chief Executive Officer

(Principal Executive Officer)

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Edmond Cheng, Chief Financial Officer of GCT Semiconductor Holding, Inc. (the “Company”), certify that:

1. the Quarterly Report on Form 10-Q of the Company for the three months ended September 30, 2024 as filed with the Securities and Exchange Commission (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.

Dated: November 14, 2024

/s/ Edmond Cheng

Edmond Cheng

Chief Financial Officer

(Principal Financial Officer)

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2024	Nov. 11, 2024
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-41013
Entity Registrant Name	GCT Semiconductor Holding, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	86-2171699
Entity Address, Address Line One	2290 North 1st Street, Suite 201
Entity Address, City or Town	San Jose
Entity Address State Or Province	CA
Entity Address, Postal Zip Code	95131
City Area Code	408
Local Phone Number	434‑6040
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		47,736,824
Entity Central Index Key	0001851961
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false
Common Stock
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	GCTS
Security Exchange Name	NYSE
Warrants, each whole warrant exercisable for one share of Common Stock for $11.50 per share
Title of 12(b) Security	Warrants, each whole warrant exercisable for one share of Common Stock for $11.50 per share
Trading Symbol	GCTSW
Security Exchange Name	NYSE

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents		$ 1,812	$ 258
Accounts receivable, net		6,441	4,920
Inventory		3,110	1,486
Contract assets		5,098	3,439
Prepaid expenses and other current assets		3,545	2,906
Total current assets		20,006	13,009
Property and equipment, net		641	772
Operating lease right-of-use assets		1,065	1,521
Intangibles, net		99	245
Other assets		810	881
Total assets		22,621	16,428
Current liabilities:
Accounts payable		1,070	17,814
Contract liabilities		511	48
Accrued and other current liabilities		22,365	23,956
Common stock forward liability		451
Borrowings		32,819	44,509
Convertible promissory notes, current		4,008	27,794
Operating lease liabilities, current		724	680
Total current liabilities		61,948	114,801
Convertible promissory notes, net of current		4,830	6,239
Net defined benefit liabilities		8,052	7,689
Long-term operating lease liabilities		358	850
Income taxes payable		2,245	2,178
Warrant liabilities		3,197
Other liabilities		242	108
Total liabilities		80,872	131,865
Commitments and contingencies (Note 8)
Stockholders' deficit:
Preferred stock, par value $0.0001 per share; 40,000 and 82,352 shares authorized as of September 30, 2024 and December 31, 2023, respectively; no shares issued and outstanding as of September 30, 2024 and December 31, 2023
Common stock, par value $0.0001 per share; 400,000 and 200,000 shares authorized as of September 30, 2024 and December 31, 2023, respectively; 47,611 and 24,166 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively	[1]	5	3
Additional paid-in capital	[1]	499,751	435,752
Accumulated other comprehensive loss		(946)	(1,538)
Accumulated deficit		(557,061)	(549,654)
Total stockholders' deficit		(58,251)	(115,437)	[2]
Total liabilities and stockholders' deficit		$ 22,621	$ 16,428

[1] Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements.)

[2] Amounts as of December 31, 2023 and before that date differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements).

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2024	Dec. 31, 2023
Condensed Consolidated Balance Sheets
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred Stock, Shares Authorized	40,000,000	82,352,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share	$ 0.0001	$ 0.0001
Common Stock, Shares Authorized	400,000,000	200,000,000
Common stock, shares issued	47,611,000	24,166,000
Common stock, shares outstanding	47,611,000	24,166,000

XML

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net revenues:
Total net revenues		$ 2,610	$ 4,476	$ 7,343	$ 11,839
Cost of net revenues:
Total cost of net revenues		984	3,949	2,843	6,960
Gross profit		1,626	527	4,500	4,879
Operating expenses:
Research and development		4,210	2,367	13,895	7,254
Sales and marketing		949	744	2,921	2,337
General and administrative		2,379	1,433	8,075	5,537
Gain on extinguishment of liability				(14,636)
Total operating expenses		7,538	4,544	10,255	15,128
Loss from operations		(5,912)	(4,017)	(5,755)	(10,249)
Interest expense		(667)	(1,220)	(3,509)	(4,878)
Other income (expenses), net		(481)	929	2,044	2,946
Loss before provision for income taxes		(7,060)	(4,308)	(7,220)	(12,181)
Provision for income taxes		61	38	187	125
Net loss		$ (7,121)	$ (4,346)	$ (7,407)	$ (12,306)
Net loss per common share - basic	[1]	$ (0.16)	$ (0.18)	$ (0.19)	$ (0.51)
Net loss per common share - diluted	[1]	$ (0.16)	$ (0.18)	$ (0.19)	$ (0.51)
Weighted average number of common shares used in computing net loss per common share - basic	[1]	45,645	24,055	38,418	23,934
Weighted average number of common shares used in computing net loss per common share - diluted	[1]	45,645	24,055	38,418	23,934
Product
Net revenues:
Total net revenues		$ 1,715	$ 4,026	$ 4,111	$ 8,667
Cost of net revenues:
Total cost of net revenues		710	3,985	1,522	5,954
Service
Net revenues:
Total net revenues		895	450	3,232	3,172
Cost of net revenues:
Total cost of net revenues		$ 274	$ (36)	$ 1,321	$ 1,006

[1] Amounts for the three and nine months ended September 30, 2023 and before that date differ from those in prior year condensed consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements).

XML

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Comprehensive loss, net of taxes:
Net loss	$ (7,121)	$ (4,346)	$ (7,407)	$ (12,306)
Foreign currency translation adjustment	(1,180)	537	592	1,386
Comprehensive loss	$ (8,301)	$ (3,809)	$ (6,815)	$ (10,920)

XML

Condensed Consolidated Statements of Stockholders' Deficit - USD ($) $ in Thousands		Total		Previously reported	Common Stock		Common Stock Previously reported	Common Stock Revision of prior period, adjustment	Additional Paid-in Capital		Additional Paid-in Capital Previously reported	Additional Paid-in Capital Revision of prior period, adjustment	Accumulated Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss) Previously reported	Accumulated Deficit		Accumulated Deficit Previously reported
Balance as at beginning at Dec. 31, 2022		$ (94,929)	[1]	$ (94,929)	$ 2	[1]	$ 128	$ (126)	$ 434,116	[1]	$ 433,990	$ 126	$ (1,862)	[1]	$ (1,862)	$ (527,185)	[1]	$ (527,185)
Balance as at beginning (in shares) at Dec. 31, 2022					23,861,000	[1]	127,761,000	(103,900,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from option exercises	[1]	1							1
Issuance of common stock from option exercises (in shares)	[1]				5,000
Stock-based compensation		2							2
Foreign currency translation adjustment		674											674
Net loss		(1,393)														(1,393)
Balance as at end at Mar. 31, 2023	[1]	(95,645)			$ 2				434,119				(1,188)			(528,578)
Balance as at end (in shares) at Mar. 31, 2023	[1]				23,866,000
Balance as at beginning at Dec. 31, 2022		(94,929)	[1]	(94,929)	$ 2	[1]	$ 128	$ (126)	434,116	[1]	433,990	126	(1,862)	[1]	(1,862)	(527,185)	[1]	(527,185)
Balance as at beginning (in shares) at Dec. 31, 2022					23,861,000	[1]	127,761,000	(103,900,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustment		1,386
Net loss		(12,306)
Balance as at end at Sep. 30, 2023	[1]	(105,746)			$ 3				434,218				(476)			(539,491)
Balance as at end (in shares) at Sep. 30, 2023	[1]				24,075,000
Balance as at beginning at Mar. 31, 2023	[1]	(95,645)			$ 2				434,119				(1,188)			(528,578)
Balance as at beginning (in shares) at Mar. 31, 2023	[1]				23,866,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from option exercises	[1]	4							4
Issuance of common stock from warrant exercise (in shares)	[1]				33,000
Issuance of common stock from conversion of convertible promissory notes and accrued interest	[1]	72							72
Issuance of common stock from conversion of convertible promissory notes and accrued interest (in shares)	[1]				4,000
Stock-based compensation		3							3
Foreign currency translation adjustment		175											175
Net loss		(6,567)														(6,567)
Balance as at end at Jun. 30, 2023	[1]	(101,958)			$ 2				434,198				(1,013)			(535,145)
Balance as at end (in shares) at Jun. 30, 2023	[1]				23,903,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from option exercises	[1]	18			$ 1				17
Issuance of common stock from option exercises (in shares)	[1]				171,000
Issuance of common stock from conversion of convertible promissory notes and accrued interest (in shares)	[1]				1,000
Stock-based compensation		3							3
Foreign currency translation adjustment		537											537
Net loss		(4,346)														(4,346)
Balance as at end at Sep. 30, 2023	[1]	(105,746)			$ 3				434,218				(476)			(539,491)
Balance as at end (in shares) at Sep. 30, 2023	[1]				24,075,000
Balance as at beginning at Dec. 31, 2023		$ (115,437)	[2]	(115,437)	$ 3	[2]	$ 129	$ (126)	435,752	[2]	435,626	126	(1,538)	[2]	(1,538)	(549,654)	[2]	(549,654)
Balance as at beginning (in shares) at Dec. 31, 2023		24,166,000			24,166,000	[2]	129,396,000	(105,230,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reverse recapitalization transaction, net of transaction costs and acquired liabilities		$ 50,033			$ 2				50,031
Reverse recapitalization transaction, net of transaction costs and acquired liabilities (in shares)					21,667,000
Stock-based compensation		1,223							1,223
Foreign currency translation adjustment		1,064											1,064
Net loss		757														757
Balance as at end at Mar. 31, 2024		(62,360)			$ 5				487,006				(474)			(548,897)
Balance as at end (in shares) at Mar. 31, 2024					45,833,000
Balance as at beginning at Dec. 31, 2023		$ (115,437)	[2]	$ (115,437)	$ 3	[2]	$ 129	$ (126)	435,752	[2]	$ 435,626	$ 126	(1,538)	[2]	$ (1,538)	(549,654)	[2]	$ (549,654)
Balance as at beginning (in shares) at Dec. 31, 2023		24,166,000			24,166,000	[2]	129,396,000	(105,230,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from option exercises (in shares)		117,670
Issuance of commitment shares in connection with common stock purchase agreement (in shares)		56,818
Foreign currency translation adjustment		$ 592
Net loss		(7,407)
Balance as at end at Sep. 30, 2024		$ (58,251)			$ 5				499,751				(946)			(557,061)
Balance as at end (in shares) at Sep. 30, 2024		47,611,000			47,611,000
Balance as at beginning at Mar. 31, 2024		$ (62,360)			$ 5				487,006				(474)			(548,897)
Balance as at beginning (in shares) at Mar. 31, 2024					45,833,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under common stock purchase agreement		$ 3,388							3,388
Issuance of common stock under common stock purchase agreement (in shares)		678,462			679,000
Issuance of commitment shares in connection with common stock purchase agreement (in shares)					57,000
Issuance of common stock to underwriter		$ 667							667
Issuance of common stock to underwriter (in shares)					110,000
Stock-based compensation		323							323
Foreign currency translation adjustment		708											708
Net loss		(1,043)														(1,043)
Balance as at end at Jun. 30, 2024		(58,317)			$ 5				491,384				234			(549,940)
Balance as at end (in shares) at Jun. 30, 2024					46,679,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock from option exercises		13							13
Issuance of common stock from option exercises (in shares)					118,000
Issuance of common stock under common stock purchase agreement		$ 5,541							5,541
Issuance of common stock under common stock purchase agreement (in shares)		1,421,715			1,422,000
Issuance of common stock and common stock warrants in a private placement		$ 2,240							2,240
Issuance of common stock and common stock warrants in a private placement (in shares)					742,000
Forfeiture of unvested sponsor earnout shares (in shares)					(1,350,000)
Stock-based compensation		573							573
Foreign currency translation adjustment		(1,180)											(1,180)
Net loss		(7,121)														(7,121)
Balance as at end at Sep. 30, 2024		$ (58,251)			$ 5				$ 499,751				$ (946)			$ (557,061)
Balance as at end (in shares) at Sep. 30, 2024		47,611,000			47,611,000

[1] Amounts as of December 31, 2023 and before that date differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements).

[2] Amounts as of December 31, 2023 and before that date differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements).

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating activities:
Net loss	$ (7,407)	$ (12,306)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	528	654
Operating lease right-of-use amortization	463	581
Stock-based compensation	2,119	8
Issuance of common stock to underwriter	667
Change in credit loss allowance	(547)	793
Change in fair value of convertible promissory notes	1,354	(1,116)
Change in fair value of warrant liabilities	(2,761)
Loss from initial recognition of common stock forward liability	586
Gain on extinguishment of liability	(14,636)
Changes in operating assets and liabilities:
Accounts receivable	(895)	(3,290)
Inventory	(1,624)	1,816
Contract assets	(1,659)	(1,984)
Prepaid expenses and other current assets	(21)	785
Other assets	70	87
Accounts payable	(2,328)	(744)
Contract liabilities	463	16
Accrued and other current liabilities	(3,040)	7,387
Net defined benefit liabilities	674	328
Income tax payable	35	(135)
Lease liabilities	(455)	(797)
Other liabilities	(275)	(3)
Net cash used in operating activities	(28,689)	(7,920)
Investing activities:
Purchases of property and equipment	(185)	(284)
Net cash used in investing activities	(185)	(284)
Financing activities:
Proceeds from reverse recapitalization and PIPE Financing, net of transaction costs	17,238
Proceeds from issuance of convertible promissory notes	16,290
Proceeds from issuance of common stock under common stock purchase agreement	7,814
Proceeds from issuance of common stock and common stock warrants in a private placement	2,240
Proceeds from borrowings	3,696	7,604
Proceeds from exercise of stock options	13	23
Repayments of borrowings	(14,065)	(23)
Repayments of convertible promissory notes	(1,630)
Payments of financial lease liabilities		(13)
Net cash provided by financing activities	31,596	7,591
Effect of exchange rate changes on cash and cash equivalents	(1,168)	(665)
Net increase (decrease) in cash and cash equivalents	1,554	(1,278)
Cash and cash equivalents at beginning of period	258	1,398
Cash and cash equivalents at end of period	1,812	120
Supplemental disclosure of cash flow information:
Cash paid for interest	3,059	1,515
Cash paid for income taxes	212	47
Cash paid for operating leases	562	797
Non-cash financing activities:
Issuance of common stock from conversion of convertible promissory notes	41,209	72
Settlement of common stock forward liability in equity	135
Proceeds from issuance of common stock withheld for outstanding payables	975
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 54	$ 1,473

XML

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (7,121)	$ (1,043)	$ 757	$ (4,346)	$ (6,567)	$ (1,393)	$ (7,407)	$ (12,306)

XML

Insider Trading Arrangements	3 Months Ended
	Sep. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

XML

Organization and Liquidity

9 Months Ended

Sep. 30, 2024

Organization and Liquidity

Organization and Liquidity

1. Organization and Liquidity

Description of Business

GCT Semiconductor Holding, Inc. (formerly known as Concord Acquisition Corp III) and its wholly owned subsidiaries (collectively “GCT” or the “Company”) is headquartered in San Jose, California with international offices in South Korea, China, Taiwan, and Japan. The Company is a fabless semiconductor company that specializes in the design, manufacturing, and sale of communication semiconductors, including high-speed wireless communication technologies such as 5G/4.75G/4.5G/4G transceivers and modems, which are essential for a wide variety of industrial, B2B and consumer applications.

On March 26, 2024 (the “Closing Date” or “Closing”), Concord Acquisition Corp III (“Concord III”), a Delaware corporation, consummated a series of transactions that resulted in the combination of Gibraltar Merger Sub Inc., a Delaware corporation and a wholly-owned subsidiary of Concord III (“Merger Sub”), and GCT Semiconductor, Inc. ( “Legacy GCT”), pursuant to a Business Combination Agreement, dated November 2, 2023 (as amended, the “Business Combination Agreement”), by and among Concord III, Merger Sub and Legacy GCT. Pursuant to the terms of the Business Combination Agreement, Merger Sub merged with and into Legacy GCT, with Legacy GCT surviving the merger as a wholly-owned subsidiary of Concord III (the “Business Combination”). On the Closing Date, Concord III changed its name from Concord III to “GCT Semiconductor Holding, Inc.”

The Business Combination was accounted for as a reverse recapitalization with Legacy GCT being the accounting acquirer and Concord III identified as the acquired company for accounting purposes. Accordingly, all historical financial information presented in the unaudited condensed consolidated financial statements represent the accounts of Legacy GCT. Subsequent to the Business Combination, the shares and net loss per common share information prior to the Closing have been retroactively restated as shares reflecting the exchange ratio established in the Closing of approximately 0.1868.

Prior to the Business Combination, Concord III’s public shares and public redeemable warrants were listed on the New York Stock Exchange (“NYSE”) under the symbols “CNDB.U,” “CNDB,” and “CNDB.WS,” respectively. On March 27, 2024, the Company’s common stock and public warrants began trading on the NYSE under the symbols “GCTS” and “GCTSW,” respectively. In connection with the Closing, Concord III’s Class A common stock and Class B common stock were recapitalized into a single class of common stock. See Note 3 for additional information.

Liquidity

The accompanying unaudited condensed consolidated financial statements have been prepared assuming the Company will continue as a going concern, which contemplates the realization of assets and liabilities and commitments in the normal course of business. Through September 30, 2024, the Company has incurred operating losses and negative cash flows from operating activities and had an accumulated deficit of $557.1 million as of September 30, 2024. The Company’s existing sources of liquidity as of September 30, 2024 include cash and cash equivalents of $1.8 million. The Company has historically funded operations primarily with issuances of capital stock and the incurrence of debt.

In March 2024, the Company received $17.2 million in cash proceeds from the reverse recapitalization and PIPE Financing (as defined in Note 3), net of transaction costs. In April 2024, the Company executed a common stock purchase agreement (“Purchase Agreement”) with B. Riley Principal Capital II, LLC (“B. Riley”). Pursuant to the Purchase Agreement, the Company has the right, but not the obligation, to sell, from time to time, B. Riley up to $50.0 million worth of shares of the Company’s common stock at its request, at any time prior to June 2026, subject to compliance with the required conditions and limitations. Through September 30, 2024, the Company received $7.8 million in net proceeds under the Purchase Agreement.

Management believes that the available financing under the Purchase Agreement and other capital resources available to the Company, including future sales of products and services, will be sufficient to fund the Company’s operations for at least 12 months after the filing date of this Quarterly Report on Form 10‑Q. To fund its operations over the longer term, the Company will need to start generating positive cash flows, renegotiate its existing debt obligations and raise additional capital through debt or equity financing. There can be no assurance that such additional debt or equity financing will be available on terms acceptable to the Company or at all.

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Summary of Significant Accounting Policies and Basis of Presentation

9 Months Ended

Sep. 30, 2024

Summary of Significant Accounting Policies and Basis of Presentation

Summary of Significant Accounting Policies and Basis of Presentation

2. Summary of Significant Accounting Policies and Basis of Presentation

Principles of Consolidation and Basis of Presentation

The unaudited condensed consolidated financial statements and accompanying notes include the accounts of the Company and its wholly owned subsidiaries, after elimination of intercompany balances and transactions. The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the requirements of the Securities and Exchange Commission (“SEC”) for interim financial information. Certain information and disclosures normally included in unaudited consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. Accordingly, these interim unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2023, which are included in the Company’s Form 8‑K filed with the SEC on April 1, 2024. The information as of December 31, 2023 included in the condensed consolidated balance sheets was derived from the audited consolidated financial statements. Certain amounts reported in the audited consolidated financial statements for the year ended December 31, 2023 have been reclassified to conform to the current year’s presentation.

The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments necessary for the fair presentation of the Company’s financial information. The unaudited condensed consolidated results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results to be expected for the year ending December 31, 2024 or for any other future annual or interim period.

Use of Estimates

The preparation of the accompanying unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make judgments, estimates, and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. These judgments, estimates, and assumptions are used for but not limited to revenue recognition, provision for credit losses, deferred income taxes and related valuation allowances, inventory obsolescence, recoverability of long-lived assets, certain accrued expenses, stock-based compensation, determination of the fair value of the Company’s financial instruments, including convertible promissory notes, common stock of Legacy GCT prior to the reverse recapitalization, warrant liabilities, stock options, and common stock forward liability. The Company bases its estimates and judgments on historical experience and on various other assumptions that it believes are reasonable under the circumstances. Actual results could differ from these estimates, and these differences may be material.

Fair Value of Financial Instruments

The carrying amount of certain financial instruments held by the Company, such as cash equivalents, accounts receivable, contract assets and liabilities, accounts payable, and accrued and other current liabilities, approximate fair value due to their short maturities. The carrying amount of the liabilities for the convertible promissory notes and the historical convertible promissory notes (see Note 5) represents their fair value. The carrying amounts of the Company’s bank borrowings and lease liabilities approximate their fair values due to the market interest rates that these obligations bear and interest rates available to the Company.

Fair value is defined as the exchange price that would be received for an asset or an exit price paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy defines a three-level valuation hierarchy for disclosure of fair value measurements as follows:

Level 1	Unadjusted quoted prices in active markets for identical assets or liabilities.
Level 2	Inputs other than quoted prices included within Level 1 that are observable, unadjusted quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the related assets or liabilities.
Level 3	Unobservable inputs that are supported by little or no market activity for the related assets or liabilities.

A financial instrument's categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s Level 3 financial instruments consist of a common stock forward liability, convertible promissory notes, and warrant liabilities.

Risk and Uncertainties

The Company is subject to certain risks and uncertainties and believes changes in any of the following areas could have a material adverse effect on the Company’s future financial position or results of operations or cash flows: 5G and other new product development, including market receptivity, the ability to satisfy obligations under development agreements with major partners, litigation or claims against the Company based on intellectual property, patent, product regulation or other factors, competition from other products, general economic conditions, the ability to attract and retain qualified employees and ultimately to sustain profitable operations.

The semiconductor industry is characterized by rapid technological change, competition, competitive pricing pressures, and cyclical market patterns. The Company’s financial results are affected by a wide variety of factors, such as general economic conditions specific to the semiconductor industry and the Company’s particular market, the timely implementation of new 5G and other new products, new manufacturing process technologies, and the ability to safeguard patents and intellectual property in a rapidly evolving market. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns. As a result, the Company may experience significant period-to-period fluctuations in unaudited condensed consolidated operating results due to the abovementioned factors.

The Company’s revenue may be impacted by its ability to obtain adequate wafer supplies from foundries and back-end production capacity from the Company’s test and assembly subcontractors. The foundries with which the Company currently has arrangements may not be willing or able to satisfy all of the Company’s manufacturing requirements on a timely basis or at favorable prices. The Company is also subject to the risks of service disruptions, raw material shortages and price increases by its foundries. Such disruptions, shortages and price increases could harm the Company’s consolidated operating results.

Provision for Credit Losses

The provision for credit losses is based on the Company’s assessment of the collectibility of its customer accounts. The Company reviews the provision for credit losses by considering certain factors such as historical experience, industry data, credit quality, age of balances, and current economic conditions that may affect a customer’s ability to pay. Uncollectible receivables are written off when all efforts to collect have been exhausted and recoveries are recognized when they are recovered. The Company determined that provisions for credit losses of approximately $1.1 million and $1.6 million were necessary as of September 30, 2024 and December 31, 2023, respectively.

Concentration of Credit Risk

The Company’s financial instruments subject to credit risk concentration consist of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents primarily with one financial institution located in the United States and another located in South Korea, where amounts deposited may exceed Federal Deposit Insurance Corporation or Korea Deposit Insurance Corporation limits. The Company’s accounts receivable balances are primarily derived from revenues recognized from customers located in the United States, China, South Korea, Japan, and Taiwan. The Company performs ongoing credit evaluations of the financial condition of its customers and distributors and generally does not require collateral.

The Company’s net revenues and accounts receivable are concentrated among a few significant customers, which could expose the Company to financial risk in the event of adverse developments. The following represents the concentration of the Company’s gross accounts receivable among key customers to the extent their share exceeds 10%:

Customer	September 30, 2024			December 31, 2023
Customer A		27	%		—	%
Customer H		20	%		19	%
Customer I		12	%		14	%
Customer J		12	%		27	%
Customer K		—	%		10	%

The following table includes customers that individually accounted for more than 10% of the Company’s net revenues in the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
Customer	2024			2023			2024			2023
Customer A		—	%		—	%		27	%		—	%
Customer B		24	%		—	%		25	%		—	%
Customer C		—	%		—	%		12	%		—	%
Customer D		—	%		—	%		—	%		25	%
Customer F		—	%		13	%		—	%		13	%
Customer H		57	%		—	%		20	%		—	%
Customer I		—	%		24	%		—	%		—	%
Customer J		—	%		47	%		—	%		20	%

Management closely monitors the creditworthiness and performance of these key customers and has established credit limits and terms to mitigate potential credit risks. The Company also continues diversifying its customer base and exploring opportunities to reduce its reliance on a few major customers.

Foreign Currency

Financial statements of foreign subsidiaries that use the local currency as their functional currency are translated into U.S. dollars at the end-of-period exchange rates or at historical exchange rates for purposes of consolidation. Revenues and expenses are translated using average exchange rates during the reporting period. Translation adjustments are included in accumulated other comprehensive loss within stockholders’ deficit. Gains and losses resulting from transactions denominated in a currency other than the functional currency are included in other income (expenses), net in the unaudited condensed consolidated statements of operations. The Company recognized foreign currency exchange losses of $1.1 million and gains of $0.8 million for the three and nine months ended September 30, 2024, respectively. The Company recognized $0.9 million and $1.8 million of foreign currency exchange gains for the three and nine months ended September 30, 2023, respectively.

Convertible Promissory Notes

The Company has elected the fair value option to account for its outstanding convertible promissory notes. Changes in the estimated fair value of the outstanding convertible promissory notes are recognized in other income (expenses), net in the condensed consolidated statements of operations.

Common Stock Warrants

Common stock warrants are classified as liabilities if they do not meet equity classification requirements based on their settlement mechanism upon a change of control and similar transactions. The corresponding liability is remeasured at fair value while the common stock warrants remain outstanding, with changes in fair value recognized in other income (expenses), net in the unaudited condensed consolidated statements of operations. Common stock warrants that meet equity classification requirements are credited to stockholders’ deficit on their issuance dates and are not subsequently remeasured.

Certain Equity Contracts

The Company’s promises to potentially issue additional shares in the future based on certain market conditions, including the Legacy GCT Earnout Shares and the Sponsor Earnout Shares, are discussed in Note 3. These financial instruments were determined to be equity classified and credited to the stockholders’ deficit upon consummation of the Business Combination.

Emerging Growth Company Status

The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS” Act). Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards using private company timelines. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that it (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition period provided in the JOBS Act. As a result, these unaudited condensed consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

Recent Accounting Pronouncements Adopted

In August 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2020‑06, Debt—Debt with Conversion and Other Options (Subtopic 470‑20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815‑40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”). ASU 2020‑06 reduces the number of accounting models for convertible instruments and allows more contracts to qualify for equity classification. The Company adopted this guidance effective January 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

In October 2021, the FASB issued ASU 2021‑08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (“ASU 2021-08”), which provides an exception to fair value measurement for contract assets and contract liabilities related to revenue contracts acquired in a business combination. ASU 2021-08 requires an acquirer to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. At the acquisition date, an acquirer should account for the related revenue contracts in accordance with Topic 606 as if it had originated the contracts. The Company adopted this guidance effective January 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

In June 2022, the FASB issued ASU 2022‑03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions (“ASU 2022-03”). ASU 2022-03 clarifies that a contractual restriction on the sale of an equity security should not be considered in measuring the fair value of the equity security and cannot be recognized as a separate unit of account. ASU 2022-03 also requires the investor to disclose the fair value of equity securities subject to contractual sale restrictions, the nature and remaining duration of the restrictions, and the circumstances that could cause a lapse in the restrictions. ASU 2022-03 is effective for annual and interim periods beginning after December 15, 2024, with early adoption permitted. The Company retrospectively adopted this guidance effective July 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”), which expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for annual periods beginning after December 15, 2023 and for interim periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the effect of the adoption of ASU 2023-07 on its unaudited condensed consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”), which requires companies to disclose, on an annual basis, specific categories in the effective tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. In addition, companies are required to disclose additional information about income taxes paid. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The standard is required to be adopted on a prospective basis; however, retrospective application is permitted. The Company is currently evaluating the effect of the adoption of ASU 2023-09 on its unaudited condensed consolidated financial statements.

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Reverse Recapitalization

9 Months Ended

Sep. 30, 2024

Reverse Recapitalization

Reverse Recapitalization

3. Reverse Recapitalization

In connection with the Business Combination described in Note 1, Concord III completed the acquisition of Legacy GCT and acquired 100% of Legacy GCT’s common stock. Legacy GCT received net proceeds of $17.1 million from the PIPE Financing (as defined below). Concord III incurred total direct transaction costs of $13.1 million, which were expensed by Concord III, and of which $0.9 million related to the PIPE Financing. Legacy GCT incurred transaction costs of $8.9 million, consisting of legal, accounting, and other professional fees, which were recorded as additional paid-in capital. Each share of Legacy GCT capital stock received a deemed value of $10.00 per share after giving effect to the applicable exchange ratio of 0.1868. Upon Closing of the Business Combination, the following occurred:

•Each share of Legacy GCT common stock issued and outstanding prior to the Closing was cancelled and converted into the right to receive a number of shares of the Company common stock at the exchange ratio of 0.1868.

•Each outstanding instrument of Legacy GCT stock options, restricted stock units (“RSUs”), and warrant shares were converted into equivalent Company stock options, RSUs, and warrant shares with the same terms and conditions and at the exchange ratio of 0.1868.

•Certain GCT convertible promissory notes, including the CVT Financing (see Note 7), were automatically converted into the right to receive a number of shares of the Company common stock at the conversion price of $6.67 per share (see Note 7).

Immediately after the Closing, the Company’s outstanding common stock included the following components (in thousands):

	Shares
Common stock of Concord III outstanding prior to the Business Combination		3,941
Less: redemption of Concord III’s common stock		(3,766	)
Sponsor earnout common stock outstanding prior to the Business Combination		8,625
Common stock of Concord III issued and outstanding		8,800
Common stock issued in PIPE Financing		4,530
Legacy GCT common stock		32,503
Total common stock issued and outstanding		45,833

The Business Combination was accounted for as a reverse recapitalization under U.S. GAAP because Legacy GCT was determined to be the accounting acquirer, and Concord III was identified as the accounting acquiree for financial reporting purposes. Accordingly, the consolidated financial statements of the Company represent a continuation of the consolidated financial statements of Legacy GCT, with the Business Combination treated as the equivalent of Legacy GCT issuing its common stock for the net assets of Concord III, accompanied by a recapitalization, and the net assets of Concord III were recorded at historical cost, with no goodwill or other intangible assets recorded. The results of operations prior to the Business Combination are those of Legacy GCT.

Legacy GCT was determined to be the accounting acquirer based the following facts and circumstances:

•Legacy GCT stockholders comprised a relative majority of the voting power of GCT;

•Legacy GCT stockholders had the ability to nominate a majority of the members of the board of directors of GCT;

•Legacy GCT’s operations prior to the Business Combination comprised the only ongoing operations of GCT;

•Legacy GCT’s senior management comprised the senior management of GCT;

•GCT substantially assumed the Legacy GCT name;

•Legacy GCT’s headquarters became GCT’s headquarters; and

•Concord III did not meet the definition of a business.

PIPE Financing

Concurrent with the execution of the Business Combination Agreement, certain investors entered into agreements and committed to purchase in a private placement an aggregate of 4,529,967 shares of the Company’s common stock (the “PIPE Shares”) at a purchase price of $6.67 per share for an aggregate purchase price of $30.2 million (the “PIPE Financing”) upon the Business Combination Closing. The PIPE Financing was consummated immediately prior to the Closing and resulted in net proceeds of $17.1 million to the Company.

Private Placement Warrants and Public Warrants

In November 2021, Concord III issued warrants to purchase shares of Concord III’s common stock that were assumed by the Company at the Closing of the Business Combination on the same terms and conditions: (i) 9,400,000 warrant shares that were issued in a private placement and held by the sponsor and another company (the “Private Placement Warrants”) and (ii) 17,250,000 warrant shares that were issued in connection with the initial public offering of Concord III (the “Public Warrants”).

The Private Placement Warrants were reallocated at the Closing of the Business Combination as follows: (i) 4,492,650 warrants were vested and retained by the sponsor parties, (ii) 2,087,350 warrants were reallocated from the sponsor parties to certain recipients at Legacy GCT’s discretion to incentivize investment, and (iii) 2,820,000 were forfeited by the sponsor parties.

Subsequent to the Closing, the outstanding Private Placement Warrants and Public Warrants remained liability-classified as the applicable provisions precluding classification in equity did not change as a result of the Business Combination.

Legacy GCT Earnout Shares

At the Closing of the Business Combination, former Legacy GCT stockholders and other investors of Legacy GCT have the right to receive up to 20,000,000 shares of Company common stock (“Legacy GCT Earnout Shares”). The Legacy GCT Earnout Shares may vest between May 2024 and March 2029 if the volume-weighted average price (“VWAP”) of the Company’s common stock for any 20 trading days within 30 consecutive trading day periods exceeds the following amounts per share (“VWAP Threshold”): (i) one-third of the shares based on the $12.50 per share VWAP Threshold, (ii) one-third of the shares based on the $15.00 per share VWAP Threshold, and (iii) one-third of the shares based on the $17.50 per share VWAP Threshold.

In the event of a future transaction that results in a change in control in which shares of the Company common stock are converted into the right to receive cash or other consideration having a value equal to or in excess of a triggering event, then the Legacy GCT Earnout Shares subject to the applicable triggering event that have not been previously issued will be issued to the Legacy GCT stockholders effective as of immediately prior to the consummation of such transaction. In the event of a transaction that results in a change in control in which shares of Company common stock are converted into the right to receive cash or other consideration having a value less than a triggering event, then the Legacy GCT Earnout Shares subject to the applicable triggering event that have not been previously issued will be forfeited.

The Legacy GCT Earnout Shares were recognized at a fair value of approximately $108.8 million upon the Closing and classified within the stockholders’ deficit as they are indexed solely to the Company’s common stock and are otherwise not precluded from equity classification based on their settlement provisions. Under the reverse recapitalization method of accounting, the fair value of the Legacy GCT Earnout Shares was treated as a deemed dividend and, in the absence of retained earnings, credited to additional paid-in capital without any impact on the stockholders’ deficit balances.

Sponsor Earnout Shares

Concurrently with entering into the Business Combination Agreement, the sponsor parties and the Company entered into that certain sponsor support agreement, as amended, modified, or supplemented (the “Sponsor Support Agreement”). Pursuant to the terms of the Sponsor Support Agreement, the sponsor parties have the right to receive up to 1,920,375 shares of the Company's common stock (“Sponsor Earnout Shares”). The Sponsor Earnout Shares are legally outstanding and remain unvested through September 30, 2024. The Sponsor Earnout Shares may vest between September 2024 and March 2029 if the VWAP of the Company’s common stock for any 20 trading days within 30 consecutive trading day periods exceeds the following VWAP Thresholds: (i) one-third of the shares based on the $12.50 per share VWAP Threshold, (ii) one-third of the shares based on the $15.00 per share VWAP Threshold, and (iii) one-third of the shares based on the $17.50 per share VWAP Threshold.

The Sponsor Earnout Shares were recognized at a fair value of approximately $10.4 million upon the Closing and classified within the stockholders’ deficit as they are indexed solely to the Company’s common stock and are otherwise not precluded from equity classification based on their settlement provisions. Under the reverse recapitalization method of accounting, the fair value of the Sponsor Earnout Shares was treated as a deemed dividend and, in the absence of retained earnings, credited to additional paid-in capital without any impact on the stockholders’ deficit balances.

In July 2024, the number of Sponsor Earnout Shares subject to the market-based vesting condition was reduced to 570,796 shares of the Company’s common stock, as the sponsor parties did not meet the required performance condition for the entire grant. The remaining 1,349,579 shares previously included in the outstanding common stock were forfeited. No adjustments to the stockholders' deficit are required upon the forfeiture of the share-based awards that contain market conditions.

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Disaggregation of Revenue

9 Months Ended

Sep. 30, 2024

Disaggregation of Revenue

Disaggregation of Revenue

4. Disaggregation of Revenue

All product revenue presented in the condensed consolidated statement of operations is recognized at a point in time, and all service revenue is recognized over time. Net revenues are categorized by customer location as follows (in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2024		2023			2024		2023
South Korea	$	1,500	$	4		$	3,500	$	3,010
United States		837		572			2,565		2,888
Germany		46		353			916		353
China		32		3,567			167		5,133
Other		195		(20	)		195		455
Total	$	2,610	$	4,476		$	7,343	$	11,839

Contract Assets and Liabilities

Net revenues recognized during the nine months ended September 30, 2024 and 2023 for the amounts included in the contract liabilities balance at the beginning of the respective annual periods are less than $0.1 million and $0.7 million, respectively.

As of September 30, 2024 and December 31, 2023, the contract assets were $5.1 million and $3.4 million, respectively. The balances of contract liabilities related to contract fulfillment were $0.5 million and immaterial as of September 30, 2024 and December 31, 2023.

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Fair Value of Measurements

9 Months Ended

Sep. 30, 2024

Fair Value of Measurements

Fair Value of Measurements

5. Fair Value of Measurements

Recurring Fair Value Measurements

The following financial instruments are measured at fair value on a recurring basis (in thousands):

	September 30, 2024
	Level 1		Level 2		Level 3		Total
Liabilities:
Convertible promissory notes	$	—	$	—	$	8,838		8,838
Warrant liabilities		—		—		3,197		3,197
Common stock forward liability		—		—		451		451

	December 31, 2023
	Level 1		Level 2		Level 3		Total
Liabilities:
Convertible promissory notes	$	—	$	—	$	34,033	$	34,033

Valuation techniques and the inputs

The table below presents valuation techniques and inputs used in the fair value measurement categorized within Level 3 of the fair value hierarchy (in thousands):

	Valuation techniques	Inputs	September 30, 2024		December 31, 2023
Convertible promissory notes, current	Discounted Cash Flow Model (“DCF”)	Discount rate, risk-free rate, credit spread, contractual cash flows	$	4,008	$	—
	PWERM	Scenario of initial public offering (“IPO”) and merger and acquisition (“M&A”)		—		27,794
Common stock forward liability	DCF	Various utilization scenarios, risk-free rate, remaining term		451		—
Convertible promissory notes, net of current	Binomial Lattice Model (“BLM”)	Stock price, volatility, remaining term, risk-free rate, credit spread		4,830		—
	PWERM	Scenario of initial public offering (“IPO”) and merger and acquisition (“M&A”)		—		6,239
Warrant liabilities	Black Scholes Merton Model (“BSM”) or BLM	Exercise price, term to expiration, volatility, risk-free rate		3,197		—

As of September 30, 2024, the key inputs for the convertible promissory notes valuation using the DCF model were as follows: remaining term ranging from 0.08 to 0.25 years and a discount rate of 10.07%. As of September 30, 2024, the key inputs for the convertible promissory notes, net of current, using the BLM were as follows: stock price of $3.35, volatility of 35.5%, remaining term of 1.4 years, risk-free rate of 3.85%, and credit spread of 5.6%.

As of September 30, 2024, the key inputs for the common stock forward valuation using the DCF model were as follows: a remaining term of 1.6 years and future risk-free rate estimates ranging from 3.78 to 4.93% for this period.

As of September 30, 2024, the key inputs for the private placement warrants using the BSM were as follows: exercise price of $11.50 per share, term to expiration of 4.5 years, volatility of 35.5%, and a risk-free rate of 3.55%. As of September 30, 2024, the key inputs for the public warrants using the BLM were as follows: exercise price of $11.50 per share and term to expiration of 4.5 years. As of September 30, 2024, the key inputs for the other warrant liabilities using the BSM were as follows: an exercise price of $10.00 per share, or $18.75 per share, term to expiration ranging from 1.41 years to 2.1 years, volatility ranging from 38.1% to 39.0%, and a risk-free rate ranging from 3.62% to 3.81%.

As of December 31, 2023, the PWERM was used as Legacy GCT was a private company. After the Closing, and as of September 30, 2024, the valuation techniques used reflect that the Business Combination was consummated.

The following table sets forth a summary of the changes in the fair value of the convertible promissory notes (in thousands):

As of December 31, 2023	$	34,033
Conversion		(41,209	)
Borrowing		16,290
Change in fair value		1,203
As of March 31, 2024		10,317
Repayment		(630	)
Change in fair value		(14	)
As of June 30, 2024		9,673
Repayment		(1,000	)
Change in fair value		165
As of September 30, 2024	$	8,838

The following table sets forth a summary of the changes in the fair value of the warrant liabilities (in thousands):

As of December 31, 2023	$	—
Fair value of warrants assumed at Closing		5,958
Change in fair value		4,626
As of March 31, 2024		10,584
Change in fair value		(6,628	)
As of June 30, 2024		3,956
Change in fair value		(759	)
As of September 30, 2024	$	3,197

The following table sets forth a summary of the changes in the fair value of the common stock forward liability (in thousands):

As of March 31, 2024	$	—
Loss from initial recognition		586
Settlement in equity		(51	)
As of June 30, 2024		535
Settlement in equity		(84	)
As of September 30, 2024	$	451

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Balance Sheet Components

9 Months Ended

Sep. 30, 2024

Balance Sheet Components [Abstract]

Balance Sheet Components

6. Balance Sheet Components

Inventory

Inventories consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Raw materials	$	1,247	$	448
Work-in-process		504		601
Finished goods		1,359		437
Total inventory	$	3,110	$	1,486

There were no inventory write-downs during the nine months ended September 30, 2024 and 2023.

Prepaid expenses and other assets

Prepaid expenses and other assets consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Prepaid expenses	$	1,372	$	433
Prepaid insurance		566		—
Prepaid research and development		565		—
Prepaid inventory		524		279
Lease deposit		422		434
Other receivables and current assets		96		117
Deferred transaction costs		—		1,643
Total prepaid expenses and other current assets	$	3,545	$	2,906

Accrued and other current liabilities

Accrued and other current liabilities consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Payroll and related expenses	$	9,126	$	9,880
Accrued payables		6,764		6,319
Other taxes payable		3,191		158
Current portion of interest payable		2,560		6,915
Professional fees		548		499
Product warranty liabilities		37		55
Royalty and license fee		43		58
Other		96		72
Total accrued and other current liabilities	$	22,365	$	23,956

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Debt

9 Months Ended

Sep. 30, 2024

Debt

Debt

7. Debt

The Company’s outstanding debt was as follows (in thousands):

	September 30, 2024					December 31, 2023
	Outstanding Principal		Fair Value			Outstanding Principal		Fair Value
Convertible promissory notes:
Historical convertible promissory notes	$	4,000	$	4,008		$	35,347	$	34,033
2024 convertible promissory note		5,000		4,830			—		—
Total convertible promissory notes		9,000		8,838			35,347		34,033
Borrowings:
KEB Hana Bank		6,820		6,820			6,980		6,980
IBK Industrial Bank		6,972		6,972			7,135		7,135
Note payable (one individual investor)		—		—			1,000		1,000
Mujin Electronics Co., Ltd.		3,789		3,789			—		—
M-Venture Investment, Inc.		—		—			7,756		7,756
Anapass, Inc., related party		9,851		9,851			10,082		10,082
i Best Investment Co., Ltd		4,546		4,546			10,082		10,082
Kyeongho Lee, related party		841		841			1,474		1,474
Total debt	$	41,819		41,657		$	79,856		78,542
Less: current portion				(36,827	)				(72,303	)
Debt, net of current portion			$	4,830				$	6,239

Expected future minimum principal payments under the Company’s total debt is as follows as of September 30, 2024 (in thousands):

Years	Convertible Notes Payable		Borrowings		Total
2024, remainder	$	4,000	$	7,813	$	11,813
2025		—		25,006		25,006
2026		5,000		—		5,000
Total debt	$	9,000	$	32,819	$	41,819

Convertible Promissory Notes

Historical Convertible Promissory Notes

Between 2017 and 2022, the Company issued convertible promissory notes to various investors with maturity dates ranging from October 2020 to April 2025. The annual interest rates varied between 4.0% and 7.0%. In November 2023, the Company entered into an amendment with certain convertible promissory noteholders to modify the conversion terms such that these notes were automatically convertible upon a special purpose acquisition company (“SPAC”) transaction. In March 2024, upon the Closing of the Business Combination, an aggregate principal and interest amount of $32.1 million converted into 4,258,223 shares of common stock at a conversion price of $10.00. In April 2024, the Company repaid one of the convertible promissory notes that was issued in 2021 with a principal amount of $0.6 million. In August and September 2024, the Company repaid one of the convertible promissory notes that was issued in 2017 with a principal amount of $1.0 million. As of September 30, 2024, the remaining principal and interest amount of $5.9 million was outstanding and related to one noteholder where conversion is at the noteholder’s discretion and at a conversion price of $3.50 per share.

2023 and 2024 Convertible Promissory Notes

In November 2023, February 2024 and March 2024, the Company issued convertible promissory notes to certain investors (the “CVT Investors”), pursuant to which the CVT Investors agreed to lend to the Company an aggregate principal amount of $13.3 million. These notes had maturity dates ranging from November 2026 to March 2027, bore an interest rate of 5.0%, and were automatically convertible upon IPO or SPAC transaction. In March 2024, upon the Closing of the Business Combination, an aggregate principal and interest amount of $13.4 million converted into 2,004,535 shares of common stock at a conversion price of $6.67. As of September 30, 2024, none of the notes issued to CVT Investors remain outstanding.

In February 2024, the Company issued a convertible promissory note to a strategic investor for a principal amount of $5.0 million, which matures in February 2026 and bears an interest rate of 5.0% per annum. On or after the earlier of (i) six months from the issuance date of the convertible promissory note and (ii) the Closing of the Business Combination, the noteholder may demand that the Company convert all principal and interest due under the convertible promissory note into shares of Company’s common stock, at a conversion price of $10.00 per share. This note includes customary representations, warranties, and events of default, as well as a covenant relating to the performance of obligations by the Company related to the Company’s 5G activity. As of September 30, 2024, the remaining principal and interest amount of $5.1 million was outstanding.

Borrowings Pursuant to Term Loan and Security Agreements

The amounts in Korean Won (“KRW”) presented below were converted into US dollars based on the applicable historical exchange rates.

KEB Hana Bank

In July 2016, the Company entered into an unsecured term loan agreement with KEB Hana Bank, pursuant to which it borrowed 9.0 billion in KRW ($6.7 million), bearing a variable interest rate (initial annual interest rate of 2.6% and interest ranging between 3.5-5.2% as of June 30, 2024), paid monthly, and maturing in July 2017. The terms of such unsecured term loan agreement have been extended annually for additional one-year terms since 2017, and the maturity date was July 2024. In April 2024, the Company executed an amendment to extend the maturity date to April 2025 for the principal amount of KRW 1.0 billion ($0.7 million) with an interest rate of 3.5%. In July 2024, the Company executed an amendment to extend the maturity date to July 2025 for the principal amount of KRW 8.0 billion ($6.0 million) with an interest rate of 4.9%. Anapass, Inc., a related party, provided certificates of deposit as collateral to KEB Hana Bank to secure the Company’s obligations under this loan (see Note 8).

IBK Industrial Bank

In January 2017, the Company entered into a term loan agreement with IBK Industrial Bank, pursuant to which the Company borrowed KRW 9.2 billion ($6.8 million). The term loan has a maturity date in November 2024 and bears an annual interest rate of 4.9%.

Note Payable (One Individual Investor)

In June 2021, the Company entered into a note payable agreement with an individual investor, pursuant to which the Company borrowed $1.0 million. The note had a maturity date of June 2024 and bears an annual interest rate of 4.0%. In April 2022, the Company entered into an amendment with this one individual investor to remove the conversion right from the note payable. In June 2024, the Company executed an amendment with the individual investor to extend the maturity date from June 2024 to August 2024. In August 2024, the Company repaid this note.

M-Venture Investment, Inc.

In October 2021, the Company entered into a term loan and security agreement with M-Venture Investment, Inc. pursuant to which the Company borrowed KRW 5.0 billion ($3.7 million) and repaid KRW 0.6 billion ($0.4 million) and KRW 0.4 billion ($0.3 million) in 2021 and 2022, respectively, such that KRW 4.0 billion ($3.0 million) remained outstanding. The term loan bears an annual interest rate of 6.5%. In April 2024, the Company executed an amendment with M-Venture Investment, Inc., pursuant to which the Company repaid KRW 2.0 billion ($1.5 million) in April 2024. In May 2024, the Company repaid the term loan in full.

In April 2022, the Company entered into a term loan and security agreement with M-Venture Investment, Inc., pursuant to which the Company borrowed amounts in two draws of KRW 1.0 billion ($0.7 million) and KRW 5.0 billion ($3.7 million), respectively. The term loan had a maturity date in April 2024, and each respective draw bears an annual interest rate of 6.5% and 8.7%. In April 2024, the Company executed an amendment with M-Venture Investment, Inc., pursuant to which the maturity date for both draws were amended. The maturity date for the principal amount of KRW 1.0 billion ($0.7 million) was extended from April 2024 to June 2024. The maturity date for the principal amount of KRW 5.0 billion ($3.7 million) was extended from April 2024 to July 2024. In July 2024, the Company partially repaid the loan of KRW 1.0 billion ($0.7 million) and transferred the remaining balance (“M-Venture Loan”) as further discussed below.

Mujin Electronics Co., Ltd.

In July 2024, the Company executed agreement with M-Venture Investment, Inc. and Mujin Electronics Co., Ltd., in which Mujin Electronics Co., Ltd. fully assumed the remaining M-Venture Loan with the same principal amount of KRW 5.0 billion ($3.7 million). The maturity date of assumed loan is January 2025, with an interest rate of 6.8%.

Anapass, Inc., Related Party

In July 2016, the Company entered into a loan agreement with Anapass, Inc. pursuant to which the Company borrowed KRW 6.0 billion ($4.5 million) in a term loan. Interest only payments are due monthly at 5.5% per annum and the principal amount of the term loan is due on the maturity date of July 2024. In July 2024, the Company and Anapass, Inc. amended the loan agreement to extend the maturity date from July 2024 to July 2025. The loan is collateralized by the Company’s assets as described under the Assets Pledged as Collateral (see Note 8).

In May and September 2022, the Company entered into two term loan agreements with Anapass, Inc. pursuant to which the Company borrowed KRW 3.0 billion ($2.2 million) and KRW 4.0 billion ($3.0 million). The term loans had respective maturity dates in May 2024 and September 2024 and both bear an annual interest rate of 5.5%. In May 2024, the Company executed an amendment with Anapass, Inc., to extend the maturity date from May 2024 to May 2025 for the term loan entered in May 2022. In September 2024, the Company executed an amendment with Anapass, Inc., to extend the maturity date from September 2024 to September 2025 for the term loan entered in September 2022.

i Best Investment Co., Ltd

Between 2022 and 2023, the Company entered into multiple term loans and security agreements with i Best Investment Co., Ltd pursuant to which it borrowed principal amounts in six draws with an aggregate principal balance of KRW 14.0 billion ($10.3 million). All of the term loans had a maturity date in June 2024 and bear an annual interest rate of 6.5%. In June 2024, the Company executed an amendment with the I Best Investment Co., Ltd to extend the maturity date from June 2024 to August 2024 for its first draw, fifth draw and sixth draw. In December 2023, the Company made a $0.8 million repayment of the outstanding principal and interest on its second draw. In March 2024, the Company repaid $2.3 million of the outstanding principal and interest amount of its fourth draw. In June 2024, the Company repaid in full of the term loans with a principal amount of $1.4 million outstanding on its third draw. In July 2024, the Company executed an amendment with i Best Investment Co., Ltd. to extend the maturity date from August 2024 to February 2025 for its first draw, fifth draw and sixth draw.

Kyeongho Lee, Related Party

Between 2017 and 2021, the Company entered into multiple promissory note and term loan agreements with Kyeongho Lee pursuant to which the Company borrowed (a) KRW 500.0 million ($0.4 million), and KRW 500.0 million ($0.4 million) in promissory notes, and (b) KRW 1.0 billion ($0.7 million) and KRW 110.0 million ($0.1 million) in term loans. The promissory notes have a maturity date in November 2024 and bear an annual interest rate varying from 7.5% and 9.0%. In March 2024, the Company repaid to Kyeongho Lee the term loan of KRW 1.0 billion ($0.7 million). The outstanding term loan had a maturity date in May 2024 and bears no interest. In May 2024, the Company executed an amendment with Kyeongho Lee to extend the maturity date from May 2024 to November 2024 for its term loan.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2024

Commitments and Contingencies

Commitments and Contingencies

8. Commitments and Contingencies

Litigations

The Company is subject to various claims arising in the ordinary course of business. Although no assurance can be given, the Company believes that it is not a party to any litigation of which the outcome, if determined adversely, would individually, or in the aggregate, be reasonably expected to have a material adverse effect on the business, consolidated operating results, cash flows or financial position of the Company as of September 30, 2024.

Third parties have from time to time claimed, and others may claim in the future, that the Company has infringed their past, current or future intellectual property rights. These claims, whether meritorious or not, could be time-consuming, result in costly litigation, require expensive changes in the Company’s methods of doing business or could require the Company to enter into costly royalty or licensing agreements, if available. As a result, these claims could harm the Company’s business, consolidated operating results, cash flows, and financial position.

Purchase Commitments

The Company has certain commitments for outstanding purchase orders related to the manufacture of certain wafers utilized by the Company and other services that, once the wafers are placed into production, are noncancelable. Otherwise, these production agreements are cancellable at any time with the Company required to pay all costs incurred through the cancellation date. However, the Company does not have a history of cancelling these agreements once production has started. As of September 30, 2024, the Company had outstanding noncancelable purchase commitments for these production agreements of $0.2 million.

Samsung Agreement Liability Release

In July 2020, the Company entered into a research and development agreement with Samsung Electronics Co., Ltd (“Samsung”). According to the agreement, the Company would design 5G chip products and Samsung would provide development and intellectual property support, mass production set up support including mask sets for manufacturing and engineering sample chip supply to the Company for a specific product. The total fee amount for the research and development (“R&D”) services pursuant to the agreement was $21.1 million. The Company bore the risk of R&D failure and was obligated to pay the $21.1 million total fee based on milestones defined in the agreement, of which $11.7 million was due based on development milestones and $9.4 million of additional NRE (“non-recurring engineering”) was to be paid within a maximum of 4 years after the planned product first shipment date. The Company recognized R&D expenses based on an estimate of the percentage completion of services provided by Samsung during the respective financial reporting period. In the first quarter of 2024, Samsung agreed to unconditionally release the Company from payment for work Samsung had completed to date because it had not met certain of the development milestones and due to a change in Samsung’s business strategy. As a result, the Company recognized a gain of $14.6 million upon such unconditional release of its liability to Samsung. During the period ended March 31, 2024, the parties mutually agreed that the agreement had expired and there were no remaining obligations of either party under the agreement.

Alpha Foundry Product Development Agreement

In February 2024, the Company and Alpha Holdings Co., Ltd. (“Alpha”) entered into a foundry product development agreement related to 5G chip development for a total fee of $7.6 million. The Company bears the risk of R&D failure and is obligated to pay the fee based on milestones defined in the agreement. The Company recognizes R&D expenses based on an estimate of the percentage completion of services provided by Alpha during the respective financial reporting period. For the three and nine months ended September 30, 2024, the Company recorded $1.2 million and $6.0 million in R&D expenses related to services provided by Alpha. The aggregate unpaid amount related to this agreement was $4.9 million as of September 30, 2024.

Assets Pledged as Collateral

The Company has provided collateral to Anapass, Inc., a related party (see Note 14), for borrowings from KEB Hana Bank, IBK Industrial Bank and Anapass, Inc. in the amount of $6.8 million, $7.0 million and $9.9 million, respectively, as of September 30, 2024, and $7.0 million, $7.1 million and $10.1 million, respectively, as of December 31, 2023 (see Note 7).

The following table includes a summary of the carrying amounts related to collateral provided to Anapass, Inc. (in thousands):

	September 30,		December 31,
	2024		2023
Cash and cash equivalents	$	1,732	$	254
Accounts receivable		6,447		4,920
Inventory		3,110		1,486
Property and equipment		206		352
Intangible assets and others		884		199

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Common Stock

9 Months Ended

Sep. 30, 2024

Common Stock

Common Stock

9. Common Stock

B. Riley Purchase Agreement

Pursuant to the Purchase Agreement, the Company has the right, but not the obligation, to sell to B. Riley, from time to time, up to $50.0 million worth of shares of its common stock (“Commitment Amount”), subject to certain limitations and conditions at the Company’s sole discretion. The price per share payable by B. Riley on each trading day represents an amount equal to 98% of the VWAP of the Company’s common stock for the applicable pricing period. The Purchase Agreement requires settlement in registered shares. In May 2024, the Company filed a registration statement on Form S-1 with the SEC, which became effective on June 6, 2024 (“Registration Statement”). The Company may sell shares of its common stock to B. Riley through June 2026 up to the Commitment Amount so long that it remains in compliance with the Purchase Agreement.

The Purchase Agreement was determined to be an equity-linked contract that contains a purchased put option on the Company’s common stock and variable share forward. These freestanding instruments are precluded from equity classification since the Purchase Agreement requires shareholder approval for the issuance of shares in excess of the applicable ownership limitation caps, which is not an input in a fixed-for-fixed option or forward on equity shares.

As of April 2024, the Company determined that the fair value of the put option was nominal due to the short settlement period of one day or less, and the Company recognized a liability of $0.6 million related to the freestanding common stock forward contract. The fair value of the common stock forward liability represents the probability-adjusted present value of the discount to be granted to B. Riley with respect to the sales of its common stock under the Purchase Agreement compared to the VWAP of the company’s common stock for the applicable pricing period.

In connection with the Purchase Agreement, the Company issued 56,818 shares of its common stock (“Commitment Shares”), which included a make-whole provision requiring the Company to reimburse B. Riley in cash if the fair value of these shares is less than $0.25 million. The Company recognized this amount as a liability which remained outstanding as of September 30, 2024 since the Commitment Shares remained unsold by B. Riley.

During the three months ended June 30, 2024, the Company sold an aggregate of 678,462 shares of common stock for $3.3 million, of which $0.5 million was withheld by B. Riley against the outstanding amounts payable, and $2.8 million was received by the Company in cash.

During the three months ended September 30, 2024, the Company sold an aggregate of 1,421,715 shares of common stock for $5.5 million. B. Riley withheld an additional $0.5 million from the aggregate proceeds against the outstanding amounts payable, and $5.0 million was received by the Company in cash.

Issuance of Common Stock to Underwriter

In April 2024, the Company authorized the issuance of 110,000 shares of its common stock to an underwriter previously involved in activities leading to the Business Combination, contingent on the Registration Statement’s effectiveness. The Company determined that its obligation to issue the underwriter shares met the criteria for equity classifications, and the underlying shares of common stock were issued in June 2024. Based on the timing of approval, the Company recognized $0.7 million in charges to equity and included this amount in general and administrative expenses for the three months ended June 30, 2024.

Private Placement

In September 2024, the Company executed a securities purchase agreement with Anapass, Inc, and issued 741,603 shares of common stock (“Anapass Shares”) and 148,320 equity-classified common stock warrants (“Anapass Warrants”) in exchange for $2.2 million in cash (“Private Placement”). The Company allocated the proceeds based on the relative fair value of the securities issued, including $2.0 million to the Anapass Shares and $0.2 million to the Anapass Warrants. The Anapass Warrants are immediately exercisable at $3.02 per share and will expire five years following the issuance date. Anapass, Inc. remains subject to a lock-up and market stand-off agreement for any shares and share-based instruments issued to it by the Company through March 2025.

Common Stock Reserved for Issuance

Upon the Closing of the Business Combination in March 2024, the Company increased its total number of authorized shares to 440,000,000 shares, consisting of 400,000,000 shares of common stock and 40,000,000 shares of preferred stock. The Company has reserved shares of common stock for issuance as follows (in thousands):

	September 30,		December 31,
	2024		2023
Common stock warrants		26,273		2,894
Legacy GCT Earnout Shares		20,000		—
Shares available for future grant from 2024 plan		3,762		—
Convertible promissory notes		713		1,835
Options issued and outstanding		550		668
Shares available for future grant from 2024 ESPP		600		—
RSUs outstanding		611		392
Shares available for future grant from 2011 plan		—		113
Total		52,509		5,902

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Warrants

9 Months Ended

Sep. 30, 2024

Warrants

Warrants

10. Warrants

The following table represents a summary of warrants to purchase shares of the Company’s common stock that are outstanding (in thousands, except for exercise price):

Issue Date	September 30, 2024		Exercise Price	Expiration
February 2023 - June 2023		2,115	$10.00 - $18.75	February 2026 – June 2026
July 2023		80	$10.00	July 2026
October 2023		100	$10.00	October 2026
Private and public warrants		23,830	$11.50	March 2029
September 2024		148	$3.02	September 2029
Total		26,273

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2024

Stock-Based Compensation

Stock-Based Compensation

11. Stock-Based Compensation

2011 Incentive Compensation Plan

Legacy GCT’s 2011 Incentive Compensation Plan (the “2011 Plan”) permitted the grant of options, stock awards, and RSUs. In connection with the Closing of the Business Combination, the 2011 Plan was terminated, the remaining unallocated shares reserved under the 2011 Plan were cancelled. In March 2024, each award of Legacy GCT stock options and RSUs were converted into equivalent Company stock options and RSUs with the same terms and conditions under the plan described below.

2024 Incentive Compensation Plan

In March 2024, the Company adopted the 2024 Omnibus Incentive Compensation Plan (the “2024 Plan”), under which 3,983,334 shares of common stock were initially reserved for issuance. The 2024 Plan permits the grant of stock options, stock appreciation rights, stock awards, RSUs, dividend equivalent rights, cash awards, and other awards to employees and non-employees, including members of the board of directors, consultants, or advisors.

Stock options outstanding under the 2024 Plan were as follows (in thousands, except per share amounts and years):

	Number of Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Lif (in Years)		Aggregate Intrinsic Value
Balance as of December 31, 2023		3,579		$	0.02		5.5	$	4,045
Reverse recapitalization		(2,911	)		0.09		—		—
Balance as of December 31, 2023(1)		668			0.11		5.5		4,045
Exercised		(118	)		0.11
Balance as of September 30, 2024		550		$	0.11		4.6	$	1,785
Vested and expected to vest as of September 30, 2024		550		$	0.11		4.6	$	1,785
Exercisable as of September 30, 2024		533		$	0.11		4.5	$	1,729

(1)Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (see Note 3).

No options were granted during the nine months ended September 30, 2024. As of September 30, 2024, unrecognized compensation cost related to stock options was nominal. The aggregate intrinsic value of 117,670 options exercised during the three months ended September 30, 2024 was $0.3 million.

Founder Awards to Board of Directors

In 2021, an aggregate of 90,000 shares of common stock were transferred to three members of Concord III’s board of directors (“Founder Shares”). The Founder Shares contained double-trigger vesting, which required continuous service and a liquidity event for any shares to vest. As the required conditions were met upon the Closing, the Company recognized $0.9 million of stock-based compensation upon the Closing in March 2024.

Restricted Stock Units

In December 2023, various employees and directors of Legacy GCT were granted 392,000 RSUs that contain both a performance condition based upon a liquidity event and a service vesting condition such that (subject to the liquidity event condition being satisfied) the RSUs vest in four equal annual installments from the grant date (“2023 RSUs”). The liquidity condition was met upon the Closing.

In June 2024, the Company granted to the members of its board of directors certain share-based awards with a fixed monetary amount of $0.7 million equally allocated among six grantees (“2024 RSUs”). The number of shares issuable to each grantee under the 2024 RSUs is calculated by dividing one-fourth of the allocated fixed monetary amount by the closing price of the Company’s common stock at the end of each fiscal quarter between April 1, 2024 and March 31, 2025. The RSUs will vest on March 31, 2025, subject to the grantees’ continuous service to the Company and will be settled in common stock on various dates in 2026 and 2027. The 2024 RSUs are initially classified as a liability and reclassified to equity up to the monetary amount for which the number of shares to be issued becomes determinable. Through September 30, 2024, this determination was made for 80,916 shares based on the closing price of the Company’s common stock as of each fiscal quarter-end after the grant date.

In August 2024, the Company granted various employees 140,000 RSUs that vest in four equal annual installments subject to continuous service.

RSUs outstanding under the 2024 Plan were as follows (in thousands, except per share amounts):

	Number of RSUs Outstanding			Weighted Average Grant Date Fair Value
Balance as of December 31, 2023		2,100		$	1.15
Reverse recapitalization		(1,708	)		5.01
Balances as of December 31, 2023(1)		392		$	6.16
Granted		221			3.69
Cancelled		(2	)		6.16
Balance as of September 30, 2024		611		$	5.26

(1)Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (see Note 3).

The Company recognized $0.6 million and $1.2 million of stock-based compensation during the three and nine months ended September 30, 2024, respectively, related to the outstanding RSUs. As of September 30, 2024, there was $2.3 million of unrecognized compensation cost related to RSUs, which is expected to be recognized on a straight-line basis over a weighted average period of 3.0 years. Any unvested RSUs are forfeited upon separation from the Company. Forfeitures are accounted for as they occur.

Stock-Based Compensation

The following table summarizes stock-based compensation included in the Company’s condensed consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
Cost of revenues		33		—		33		—
Research and development		135		1		389		3
Sales and marketing		36		1		108		3
General and administrative		369		1		1,589		2
Total	$	573	$	3	$	2,119	$	8

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Income Taxes

9 Months Ended

Sep. 30, 2024

Income Taxes

Income Taxes

12. Income Taxes

For financial reporting purposes, the Company’s effective tax rate used for the interim periods is based on the estimated full-year income tax rate. For the three and nine months ended September 30, 2024, the Company’s effective tax rate differs from the statutory rate primarily due to the valuation allowance recorded against the net deferred tax asset balance.

For the nine months ended September 30, 2024 and 2023, the Company recorded income tax of $0.2 million and $0.1 million, respectively. The effective tax rate is (2.6)% and (1.0)% for nine months ended September 30, 2024 and 2023, respectively. Through September 30, 2024, the Company was not under examination by any taxing authority.

As of September 30, 2024 the Company had unrecognized tax benefits of $3.1 million of which $1.7 million would currently affect the Company’s effective tax rate if recognized due to the Company’s deferred tax assets being fully offset by a valuation allowance. The Company does not anticipate that the amount of unrecognized tax benefits relating to tax positions existing as of September 30, 2024 will significantly increase or decrease within the next twelve months. There was no interest expense or penalties related to unrecognized tax benefits recorded as of September 30, 2024.

A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, the Company believes that its reserves for income taxes reflect the most likely outcome. The Company adjusts these reserves, as well as the related interest, considering changing facts and circumstances.

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2024

Employee Benefit Plans

Employee Benefit Plans

13. Employee Benefit Plans

Under Korean law, the Company is required to make severance payments to Korean employees leaving their employment. The Company’s severance pay liability to its Korean employees, which is a function of the employee’s salary, years of employment, and severance factor, is reflected in the accompanying unaudited condensed consolidated balance sheets as the net defined benefit liabilities on an accrual basis. The net liability for severance payments was as follows (in thousands):

	September 30, 2024			December 31, 2023
Liability for severance payments, gross	$	8,328		$	7,997
Plan assets		(276	)		(308	)
Liability for severance payments, net	$	8,052		$	7,689

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Related Party Transactions

9 Months Ended

Sep. 30, 2024

Related Party Transactions

Related Party Transactions

14. Related Party Transactions

A summary of balances and transactions with the related parties who are stockholders of the Company were as follows (in thousands):

	September 30, 2024				December 31, 2023
	Anapass		Kyeongho Lee		Anapass		Kyeongho Lee
Borrowings	$	9,851	$	841	$	10,082	$	1,474
Other current liabilities		9		86		212		182

For each of the three and nine months ended September 30, 2024, the Company recorded $0.1 million and $0.4 million, respectively, of interest expense with Anapass, Inc. in the unaudited condensed consolidated statements of operations. For each of the three and nine months ended September 30, 2023, the Company recorded $0.1 million and $0.4 million, respectively, of interest expense with Anapass, Inc. in the unaudited condensed consolidated statements of operations. Interest expense related to the Company’s arrangements with Kyeongho Lee was immaterial during the three and nine months ended September 30, 2024 and 2023.

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Segments and Information

9 Months Ended

Sep. 30, 2024

Segments and Information

Segments and Information

15. Segments and Information

The Company operates in one segment. Revenue information by geographic region is presented in Note 4 to these unaudited condensed consolidated financial statements. Tangible long-lived assets by geographic region were as follows (in thousands):

	September 30, 2024		December 31, 2023
South Korea	$	1,041	$	1,363
United States		665		930
Total	$	1,706	$	2,293

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Net Loss Per Share

9 Months Ended

Sep. 30, 2024

Net Loss Per Share

Net Loss Per Share

16. Net Loss Per Share

The following outstanding potentially dilutive common stock equivalents were excluded from the computation of diluted net loss per share for the periods indicated because including them would have been antidilutive (in thousands):

	September 30,
	2024		2023
Warrants		26,273		2,214
Legacy GCT Earnout Shares		20,000		—
Sponsor Earnout Shares		571		—
Convertible promissory notes		713		1,806
Options		550		670
RSU		611		—
Total		48,718		4,690

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Subsequent Events

9 Months Ended

Sep. 30, 2024

Subsequent Events

Subsequent Events

17. Subsequent Events

Mujin Electronics Co., Ltd.

In October 2024, the Company executed an amendment with Mujin Electronics Co., Ltd. to extend the maturity date of KRW 5.0 billion ($3.7 million) loan from January 2025 to June 2025.

i Best Investment Co., Ltd

In October 2024, the Company executed an amendment with i Best Investment Co., Ltd. to extend the maturity date from February 2025 to May 2025 for its sixth draw.

Historical Convertible Promissory Notes

In October 2024, the Company repaid one of the convertible promissory notes that was issued in 2017 with a principal amount of $1.0 million.

Purchase Agreement

In October 2024, the Company sold 103,596 shares of its common stock for gross proceeds of $0.3 million received by the Company in cash.

Kyeongho Lee, Related Party

In November 2024, the Company entered into a term loan agreement with Kyeongho Lee, a member of the Company’s board of directors, pursuant to which the Company borrowed KRW 4.0 billion ($2.9 million). The loan has a maturity date of December 31, 2024 and bears an annual interest rate of 12.0%.

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Summary of Significant Accounting Policies and Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2024

Summary of Significant Accounting Policies and Basis of Presentation

Principles of Consolidation and Basis of Presentation

Principles of Consolidation and Basis of Presentation

The unaudited condensed consolidated financial statements and accompanying notes include the accounts of the Company and its wholly owned subsidiaries, after elimination of intercompany balances and transactions. The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the requirements of the Securities and Exchange Commission (“SEC”) for interim financial information. Certain information and disclosures normally included in unaudited consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. Accordingly, these interim unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2023, which are included in the Company’s Form 8‑K filed with the SEC on April 1, 2024. The information as of December 31, 2023 included in the condensed consolidated balance sheets was derived from the audited consolidated financial statements. Certain amounts reported in the audited consolidated financial statements for the year ended December 31, 2023 have been reclassified to conform to the current year’s presentation.

The unaudited condensed consolidated financial statements have been prepared on the same basis as the annual consolidated financial statements and, in the opinion of management, reflect all adjustments, which include only normal recurring adjustments necessary for the fair presentation of the Company’s financial information. The unaudited condensed consolidated results of operations for the three and nine months ended September 30, 2024 are not necessarily indicative of the results to be expected for the year ending December 31, 2024 or for any other future annual or interim period.

Use of Estimates

Use of Estimates

The preparation of the accompanying unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make judgments, estimates, and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. These judgments, estimates, and assumptions are used for but not limited to revenue recognition, provision for credit losses, deferred income taxes and related valuation allowances, inventory obsolescence, recoverability of long-lived assets, certain accrued expenses, stock-based compensation, determination of the fair value of the Company’s financial instruments, including convertible promissory notes, common stock of Legacy GCT prior to the reverse recapitalization, warrant liabilities, stock options, and common stock forward liability. The Company bases its estimates and judgments on historical experience and on various other assumptions that it believes are reasonable under the circumstances. Actual results could differ from these estimates, and these differences may be material.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The carrying amount of certain financial instruments held by the Company, such as cash equivalents, accounts receivable, contract assets and liabilities, accounts payable, and accrued and other current liabilities, approximate fair value due to their short maturities. The carrying amount of the liabilities for the convertible promissory notes and the historical convertible promissory notes (see Note 5) represents their fair value. The carrying amounts of the Company’s bank borrowings and lease liabilities approximate their fair values due to the market interest rates that these obligations bear and interest rates available to the Company.

Fair value is defined as the exchange price that would be received for an asset or an exit price paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy defines a three-level valuation hierarchy for disclosure of fair value measurements as follows:

Level 1	Unadjusted quoted prices in active markets for identical assets or liabilities.
Level 2	Inputs other than quoted prices included within Level 1 that are observable, unadjusted quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the related assets or liabilities.
Level 3	Unobservable inputs that are supported by little or no market activity for the related assets or liabilities.

A financial instrument's categorization within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s Level 3 financial instruments consist of a common stock forward liability, convertible promissory notes, and warrant liabilities.

Risk and Uncertainties

Risk and Uncertainties

The Company is subject to certain risks and uncertainties and believes changes in any of the following areas could have a material adverse effect on the Company’s future financial position or results of operations or cash flows: 5G and other new product development, including market receptivity, the ability to satisfy obligations under development agreements with major partners, litigation or claims against the Company based on intellectual property, patent, product regulation or other factors, competition from other products, general economic conditions, the ability to attract and retain qualified employees and ultimately to sustain profitable operations.

The semiconductor industry is characterized by rapid technological change, competition, competitive pricing pressures, and cyclical market patterns. The Company’s financial results are affected by a wide variety of factors, such as general economic conditions specific to the semiconductor industry and the Company’s particular market, the timely implementation of new 5G and other new products, new manufacturing process technologies, and the ability to safeguard patents and intellectual property in a rapidly evolving market. In addition, the semiconductor market has historically been cyclical and subject to significant economic downturns. As a result, the Company may experience significant period-to-period fluctuations in unaudited condensed consolidated operating results due to the abovementioned factors.

The Company’s revenue may be impacted by its ability to obtain adequate wafer supplies from foundries and back-end production capacity from the Company’s test and assembly subcontractors. The foundries with which the Company currently has arrangements may not be willing or able to satisfy all of the Company’s manufacturing requirements on a timely basis or at favorable prices. The Company is also subject to the risks of service disruptions, raw material shortages and price increases by its foundries. Such disruptions, shortages and price increases could harm the Company’s consolidated operating results.

Provision for Credit Losses

Provision for Credit Losses

The provision for credit losses is based on the Company’s assessment of the collectibility of its customer accounts. The Company reviews the provision for credit losses by considering certain factors such as historical experience, industry data, credit quality, age of balances, and current economic conditions that may affect a customer’s ability to pay. Uncollectible receivables are written off when all efforts to collect have been exhausted and recoveries are recognized when they are recovered. The Company determined that provisions for credit losses of approximately $1.1 million and $1.6 million were necessary as of September 30, 2024 and December 31, 2023, respectively.

Concentration of Credit Risk

Concentration of Credit Risk

The Company’s financial instruments subject to credit risk concentration consist of cash and cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents primarily with one financial institution located in the United States and another located in South Korea, where amounts deposited may exceed Federal Deposit Insurance Corporation or Korea Deposit Insurance Corporation limits. The Company’s accounts receivable balances are primarily derived from revenues recognized from customers located in the United States, China, South Korea, Japan, and Taiwan. The Company performs ongoing credit evaluations of the financial condition of its customers and distributors and generally does not require collateral.

The Company’s net revenues and accounts receivable are concentrated among a few significant customers, which could expose the Company to financial risk in the event of adverse developments. The following represents the concentration of the Company’s gross accounts receivable among key customers to the extent their share exceeds 10%:

Customer	September 30, 2024			December 31, 2023
Customer A		27	%		—	%
Customer H		20	%		19	%
Customer I		12	%		14	%
Customer J		12	%		27	%
Customer K		—	%		10	%

The following table includes customers that individually accounted for more than 10% of the Company’s net revenues in the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
Customer	2024			2023			2024			2023
Customer A		—	%		—	%		27	%		—	%
Customer B		24	%		—	%		25	%		—	%
Customer C		—	%		—	%		12	%		—	%
Customer D		—	%		—	%		—	%		25	%
Customer F		—	%		13	%		—	%		13	%
Customer H		57	%		—	%		20	%		—	%
Customer I		—	%		24	%		—	%		—	%
Customer J		—	%		47	%		—	%		20	%

Management closely monitors the creditworthiness and performance of these key customers and has established credit limits and terms to mitigate potential credit risks. The Company also continues diversifying its customer base and exploring opportunities to reduce its reliance on a few major customers.

Foreign Currency

Foreign Currency

Financial statements of foreign subsidiaries that use the local currency as their functional currency are translated into U.S. dollars at the end-of-period exchange rates or at historical exchange rates for purposes of consolidation. Revenues and expenses are translated using average exchange rates during the reporting period. Translation adjustments are included in accumulated other comprehensive loss within stockholders’ deficit. Gains and losses resulting from transactions denominated in a currency other than the functional currency are included in other income (expenses), net in the unaudited condensed consolidated statements of operations. The Company recognized foreign currency exchange losses of $1.1 million and gains of $0.8 million for the three and nine months ended September 30, 2024, respectively. The Company recognized $0.9 million and $1.8 million of foreign currency exchange gains for the three and nine months ended September 30, 2023, respectively.

Convertible Promissory Notes

Convertible Promissory Notes

The Company has elected the fair value option to account for its outstanding convertible promissory notes. Changes in the estimated fair value of the outstanding convertible promissory notes are recognized in other income (expenses), net in the condensed consolidated statements of operations.

Common Stock Warrants

Common Stock Warrants

Common stock warrants are classified as liabilities if they do not meet equity classification requirements based on their settlement mechanism upon a change of control and similar transactions. The corresponding liability is remeasured at fair value while the common stock warrants remain outstanding, with changes in fair value recognized in other income (expenses), net in the unaudited condensed consolidated statements of operations. Common stock warrants that meet equity classification requirements are credited to stockholders’ deficit on their issuance dates and are not subsequently remeasured.

Certain Equity Contracts

Certain Equity Contracts

The Company’s promises to potentially issue additional shares in the future based on certain market conditions, including the Legacy GCT Earnout Shares and the Sponsor Earnout Shares, are discussed in Note 3. These financial instruments were determined to be equity classified and credited to the stockholders’ deficit upon consummation of the Business Combination.

Emerging Growth Company Status

Emerging Growth Company Status

The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS” Act). Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards using private company timelines. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that it (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition period provided in the JOBS Act. As a result, these unaudited condensed consolidated financial statements may not be comparable to companies that comply with the new or revised accounting pronouncements as of public company effective dates.

Recent Accounting Pronouncements

Recent Accounting Pronouncements Adopted

In August 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2020‑06, Debt—Debt with Conversion and Other Options (Subtopic 470‑20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815‑40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”). ASU 2020‑06 reduces the number of accounting models for convertible instruments and allows more contracts to qualify for equity classification. The Company adopted this guidance effective January 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

In October 2021, the FASB issued ASU 2021‑08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (“ASU 2021-08”), which provides an exception to fair value measurement for contract assets and contract liabilities related to revenue contracts acquired in a business combination. ASU 2021-08 requires an acquirer to recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with Topic 606. At the acquisition date, an acquirer should account for the related revenue contracts in accordance with Topic 606 as if it had originated the contracts. The Company adopted this guidance effective January 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

In June 2022, the FASB issued ASU 2022‑03, Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions (“ASU 2022-03”). ASU 2022-03 clarifies that a contractual restriction on the sale of an equity security should not be considered in measuring the fair value of the equity security and cannot be recognized as a separate unit of account. ASU 2022-03 also requires the investor to disclose the fair value of equity securities subject to contractual sale restrictions, the nature and remaining duration of the restrictions, and the circumstances that could cause a lapse in the restrictions. ASU 2022-03 is effective for annual and interim periods beginning after December 15, 2024, with early adoption permitted. The Company retrospectively adopted this guidance effective July 1, 2024 and noted no material impact on the Company’s unaudited condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”), which expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for annual periods beginning after December 15, 2023 and for interim periods beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the effect of the adoption of ASU 2023-07 on its unaudited condensed consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (“ASU 2023-09”), which requires companies to disclose, on an annual basis, specific categories in the effective tax rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold. In addition, companies are required to disclose additional information about income taxes paid. ASU 2023-09 is effective for annual periods beginning after December 15, 2024, with early adoption permitted. The standard is required to be adopted on a prospective basis; however, retrospective application is permitted. The Company is currently evaluating the effect of the adoption of ASU 2023-09 on its unaudited condensed consolidated financial statements.

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Summary of Significant Accounting Policies and Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2024

Summary of Significant Accounting Policies and Basis of Presentation

Schedule of net revenues and accounts receivable concentration

The following represents the concentration of the Company’s gross accounts receivable among key customers to the extent their share exceeds 10%:

Customer	September 30, 2024			December 31, 2023
Customer A		27	%		—	%
Customer H		20	%		19	%
Customer I		12	%		14	%
Customer J		12	%		27	%
Customer K		—	%		10	%

The following table includes customers that individually accounted for more than 10% of the Company’s net revenues in the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
Customer	2024			2023			2024			2023
Customer A		—	%		—	%		27	%		—	%
Customer B		24	%		—	%		25	%		—	%
Customer C		—	%		—	%		12	%		—	%
Customer D		—	%		—	%		—	%		25	%
Customer F		—	%		13	%		—	%		13	%
Customer H		57	%		—	%		20	%		—	%
Customer I		—	%		24	%		—	%		—	%
Customer J		—	%		47	%		—	%		20	%

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Reverse Recapitalization (Tables)

9 Months Ended

Sep. 30, 2024

Reverse Recapitalization

Schedule of outstanding common stock

Immediately after the Closing, the Company’s outstanding common stock included the following components (in thousands):

	Shares
Common stock of Concord III outstanding prior to the Business Combination		3,941
Less: redemption of Concord III’s common stock		(3,766	)
Sponsor earnout common stock outstanding prior to the Business Combination		8,625
Common stock of Concord III issued and outstanding		8,800
Common stock issued in PIPE Financing		4,530
Legacy GCT common stock		32,503
Total common stock issued and outstanding		45,833

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Disaggregation of Revenue (Tables)

9 Months Ended

Sep. 30, 2024

Organization and Liquidity

Schedule of disaggregation of revenues from contracts with customers and categorized by customer location

All product revenue presented in the condensed consolidated statement of operations is recognized at a point in time, and all service revenue is recognized over time. Net revenues are categorized by customer location as follows (in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2024		2023			2024		2023
South Korea	$	1,500	$	4		$	3,500	$	3,010
United States		837		572			2,565		2,888
Germany		46		353			916		353
China		32		3,567			167		5,133
Other		195		(20	)		195		455
Total	$	2,610	$	4,476		$	7,343	$	11,839

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Fair Value of Measurements (Tables)

9 Months Ended

Sep. 30, 2024

Fair Value of Measurements

Schedule of Financial Instruments are Measured at Fair Value on a Recurring Basis

The following financial instruments are measured at fair value on a recurring basis (in thousands):

	September 30, 2024
	Level 1		Level 2		Level 3		Total
Liabilities:
Convertible promissory notes	$	—	$	—	$	8,838		8,838
Warrant liabilities		—		—		3,197		3,197
Common stock forward liability		—		—		451		451

	December 31, 2023
	Level 1		Level 2		Level 3		Total
Liabilities:
Convertible promissory notes	$	—	$	—	$	34,033	$	34,033

Schedule of Valuation Techniques and Inputs Used in the Fair Value Measurement

The table below presents valuation techniques and inputs used in the fair value measurement categorized within Level 3 of the fair value hierarchy (in thousands):

	Valuation techniques	Inputs	September 30, 2024		December 31, 2023
Convertible promissory notes, current	Discounted Cash Flow Model (“DCF”)	Discount rate, risk-free rate, credit spread, contractual cash flows	$	4,008	$	—
	PWERM	Scenario of initial public offering (“IPO”) and merger and acquisition (“M&A”)		—		27,794
Common stock forward liability	DCF	Various utilization scenarios, risk-free rate, remaining term		451		—
Convertible promissory notes, net of current	Binomial Lattice Model (“BLM”)	Stock price, volatility, remaining term, risk-free rate, credit spread		4,830		—
	PWERM	Scenario of initial public offering (“IPO”) and merger and acquisition (“M&A”)		—		6,239
Warrant liabilities	Black Scholes Merton Model (“BSM”) or BLM	Exercise price, term to expiration, volatility, risk-free rate		3,197		—

Schedule of Changes in the Fair Value of the Company's Level 3 Financial Liabilities

The following table sets forth a summary of the changes in the fair value of the convertible promissory notes (in thousands):

As of December 31, 2023	$	34,033
Conversion		(41,209	)
Borrowing		16,290
Change in fair value		1,203
As of March 31, 2024		10,317
Repayment		(630	)
Change in fair value		(14	)
As of June 30, 2024		9,673
Repayment		(1,000	)
Change in fair value		165
As of September 30, 2024	$	8,838

The following table sets forth a summary of the changes in the fair value of the warrant liabilities (in thousands):

As of December 31, 2023	$	—
Fair value of warrants assumed at Closing		5,958
Change in fair value		4,626
As of March 31, 2024		10,584
Change in fair value		(6,628	)
As of June 30, 2024		3,956
Change in fair value		(759	)
As of September 30, 2024	$	3,197

The following table sets forth a summary of the changes in the fair value of the common stock forward liability (in thousands):

As of March 31, 2024	$	—
Loss from initial recognition		586
Settlement in equity		(51	)
As of June 30, 2024		535
Settlement in equity		(84	)
As of September 30, 2024	$	451

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Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2024

Balance Sheet Components [Abstract]

Schedule of Inventory

Inventories consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Raw materials	$	1,247	$	448
Work-in-process		504		601
Finished goods		1,359		437
Total inventory	$	3,110	$	1,486

Schedule of Prepaid Expenses and Other Assets

Prepaid expenses and other assets consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Prepaid expenses	$	1,372	$	433
Prepaid insurance		566		—
Prepaid research and development		565		—
Prepaid inventory		524		279
Lease deposit		422		434
Other receivables and current assets		96		117
Deferred transaction costs		—		1,643
Total prepaid expenses and other current assets	$	3,545	$	2,906

Schedule of Accrued and Other Current Liabilities

Accrued and other current liabilities consist of the following (in thousands):

	September 30,		December 31,
	2024		2023
Payroll and related expenses	$	9,126	$	9,880
Accrued payables		6,764		6,319
Other taxes payable		3,191		158
Current portion of interest payable		2,560		6,915
Professional fees		548		499
Product warranty liabilities		37		55
Royalty and license fee		43		58
Other		96		72
Total accrued and other current liabilities	$	22,365	$	23,956

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Debt (Tables)

9 Months Ended

Sep. 30, 2024

Debt

Schedule of outstanding debt

The Company’s outstanding debt was as follows (in thousands):

	September 30, 2024					December 31, 2023
	Outstanding Principal		Fair Value			Outstanding Principal		Fair Value
Convertible promissory notes:
Historical convertible promissory notes	$	4,000	$	4,008		$	35,347	$	34,033
2024 convertible promissory note		5,000		4,830			—		—
Total convertible promissory notes		9,000		8,838			35,347		34,033
Borrowings:
KEB Hana Bank		6,820		6,820			6,980		6,980
IBK Industrial Bank		6,972		6,972			7,135		7,135
Note payable (one individual investor)		—		—			1,000		1,000
Mujin Electronics Co., Ltd.		3,789		3,789			—		—
M-Venture Investment, Inc.		—		—			7,756		7,756
Anapass, Inc., related party		9,851		9,851			10,082		10,082
i Best Investment Co., Ltd		4,546		4,546			10,082		10,082
Kyeongho Lee, related party		841		841			1,474		1,474
Total debt	$	41,819		41,657		$	79,856		78,542
Less: current portion				(36,827	)				(72,303	)
Debt, net of current portion			$	4,830				$	6,239

Schedule of Expected future minimum principal payments under the company's total debt

Expected future minimum principal payments under the Company’s total debt is as follows as of September 30, 2024 (in thousands):

Years	Convertible Notes Payable		Borrowings		Total
2024, remainder	$	4,000	$	7,813	$	11,813
2025		—		25,006		25,006
2026		5,000		—		5,000
Total debt	$	9,000	$	32,819	$	41,819

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2024

Commitments and Contingencies

Schedule of carrying amounts related to collateral provided to Anapass, Inc

The following table includes a summary of the carrying amounts related to collateral provided to Anapass, Inc. (in thousands):

	September 30,		December 31,
	2024		2023
Cash and cash equivalents	$	1,732	$	254
Accounts receivable		6,447		4,920
Inventory		3,110		1,486
Property and equipment		206		352
Intangible assets and others		884		199

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Common Stock (Tables)

9 Months Ended

Sep. 30, 2024

Common Stock

Summary of reserved shares of common stock for issuance

	September 30,		December 31,
	2024		2023
Common stock warrants		26,273		2,894
Legacy GCT Earnout Shares		20,000		—
Shares available for future grant from 2024 plan		3,762		—
Convertible promissory notes		713		1,835
Options issued and outstanding		550		668
Shares available for future grant from 2024 ESPP		600		—
RSUs outstanding		611		392
Shares available for future grant from 2011 plan		—		113
Total		52,509		5,902

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Warrants (Tables)

9 Months Ended

Sep. 30, 2024

Warrants

Summary of warrants to purchase shares of the company's common stock that are outstanding

The following table represents a summary of warrants to purchase shares of the Company’s common stock that are outstanding (in thousands, except for exercise price):

Issue Date	September 30, 2024		Exercise Price	Expiration
February 2023 - June 2023		2,115	$10.00 - $18.75	February 2026 – June 2026
July 2023		80	$10.00	July 2026
October 2023		100	$10.00	October 2026
Private and public warrants		23,830	$11.50	March 2029
September 2024		148	$3.02	September 2029
Total		26,273

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2024

Stock-Based Compensation

Summary of Stock Option Activity

Stock options outstanding under the 2024 Plan were as follows (in thousands, except per share amounts and years):

	Number of Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Lif (in Years)		Aggregate Intrinsic Value
Balance as of December 31, 2023		3,579		$	0.02		5.5	$	4,045
Reverse recapitalization		(2,911	)		0.09		—		—
Balance as of December 31, 2023(1)		668			0.11		5.5		4,045
Exercised		(118	)		0.11
Balance as of September 30, 2024		550		$	0.11		4.6	$	1,785
Vested and expected to vest as of September 30, 2024		550		$	0.11		4.6	$	1,785
Exercisable as of September 30, 2024		533		$	0.11		4.5	$	1,729

(1)Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (see Note 3).

Summary of RSUs Activity

RSUs outstanding under the 2024 Plan were as follows (in thousands, except per share amounts):

	Number of RSUs Outstanding			Weighted Average Grant Date Fair Value
Balance as of December 31, 2023		2,100		$	1.15
Reverse recapitalization		(1,708	)		5.01
Balances as of December 31, 2023(1)		392		$	6.16
Granted		221			3.69
Cancelled		(2	)		6.16
Balance as of September 30, 2024		611		$	5.26

(1)Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (see Note 3).

Schedule of Stock-Based Compensation Allocation

The following table summarizes stock-based compensation included in the Company’s condensed consolidated statements of operations:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2024		2023		2024		2023
Cost of revenues		33		—		33		—
Research and development		135		1		389		3
Sales and marketing		36		1		108		3
General and administrative		369		1		1,589		2
Total	$	573	$	3	$	2,119	$	8

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2024

Employee Benefit Plans

Summary of net liability for severance payments

The net liability for severance payments was as follows (in thousands):

	September 30, 2024			December 31, 2023
Liability for severance payments, gross	$	8,328		$	7,997
Plan assets		(276	)		(308	)
Liability for severance payments, net	$	8,052		$	7,689

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Related Party Transactions (Tables)

9 Months Ended

Sep. 30, 2024

Related Party Transactions

Summary of balances and transactions with the related parties

A summary of balances and transactions with the related parties who are stockholders of the Company were as follows (in thousands):

	September 30, 2024				December 31, 2023
	Anapass		Kyeongho Lee		Anapass		Kyeongho Lee
Borrowings	$	9,851	$	841	$	10,082	$	1,474
Other current liabilities		9		86		212		182

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Segments and Information (Tables)

9 Months Ended

Sep. 30, 2024

Segments and Information

Summary of long-lived assets by geographic region

The Company operates in one segment. Revenue information by geographic region is presented in Note 4 to these unaudited condensed consolidated financial statements. Tangible long-lived assets by geographic region were as follows (in thousands):

	September 30, 2024		December 31, 2023
South Korea	$	1,041	$	1,363
United States		665		930
Total	$	1,706	$	2,293

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Net Loss Per Share (Tables)

9 Months Ended

Sep. 30, 2024

Net Loss Per Share

Schedule of potentially dilutive common stock equivalents that were excluded from the computation of diluted net loss per share

The following outstanding potentially dilutive common stock equivalents were excluded from the computation of diluted net loss per share for the periods indicated because including them would have been antidilutive (in thousands):

	September 30,
	2024		2023
Warrants		26,273		2,214
Legacy GCT Earnout Shares		20,000		—
Sponsor Earnout Shares		571		—
Convertible promissory notes		713		1,806
Options		550		670
RSU		611		—
Total		48,718		4,690

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Organization and Liquidity (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Mar. 26, 2024	Dec. 31, 2023 USD ($)
Organization and Liquidity
Exchange ratio					0.00001868
Accumulated deficit		$ (557,061)		$ (557,061)		$ (549,654)
Cash and cash equivalents		1,812		1,812		$ 258
Cash proceeds from the reverse recapitalization and PIPE Financing	$ 17,200			17,238
Proceeds from Issuance of Common Stock		$ 5,000	$ 2,800	$ 7,814
B. Riley Principal Capital II, LLC
Organization and Liquidity
Stock Sale Commitment Amount	$ 50,000

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Summary of Significant Accounting Policies and Basis of Presentation - Provision for Credit Losses (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Summary of Significant Accounting Policies and Basis of Presentation
Provisions for credit losses	$ 1.1	$ 1.6

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Summary of Significant Accounting Policies and Basis of Presentation - Concentration of Revenues and Accounts Receivable (Details) - Customer concentration	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Revenue | Customer A
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage			27.00%
Revenue | Customer B
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage	24.00%		25.00%
Revenue | Customer C
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage			12.00%
Revenue | Customer D
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage				25.00%
Revenue | Customer F
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage		13.00%		13.00%
Revenue | Customer H
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage	57.00%		20.00%
Revenue | Customer I
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage		24.00%
Revenue | Customer J
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage		47.00%		20.00%
Accounts receivable | Customer A
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage			27.00%
Accounts receivable | Customer H
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage			20.00%		19.00%
Accounts receivable | Customer I
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage			12.00%		14.00%
Accounts receivable | Customer J
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage			12.00%		27.00%
Accounts receivable | Customer K
Summary of Significant Accounting Policies and Basis of Presentation
Concentration risk percentage					10.00%

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Summary of Significant Accounting Policies and Basis of Presentation - Foreign Currency (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Summary of Significant Accounting Policies and Basis of Presentation
Foreign currency (loss) gain, net	$ (1.1)	$ 0.9	$ 0.8	$ 1.8

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Summary of Significant Accounting Policies and Basis of Presentation - Recent Accounting Pronouncements Adopted (Details)	Sep. 30, 2024
ASU 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2024
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU 2021-08
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2024
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true
ASU 2022-03
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jul. 01, 2024
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]	true

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Reverse Recapitalization - Business Combination - Additional Information (Details) $ / shares in Units, $ in Millions	Mar. 26, 2024 USD ($) $ / shares
Concord III
Reverse Recapitalization
Transaction costs incurred in acquisition	$ 13.1
Concord III | PIPE financing
Reverse Recapitalization
Transaction costs incurred in acquisition	0.9
Legacy G C T
Reverse Recapitalization
Transaction costs incurred in acquisition	$ 8.9
Legacy G C T | Concord III
Reverse Recapitalization
Percentage of ownership acquired	100.00%
Net proceeds received on acquisition	$ 17.1
Share price in business acquisition | $ / shares	$ 10
Stock exchange ratio	0.1868
Legacy G C T | Concord III | Convertible debt
Reverse Recapitalization
Conversion price | $ / shares	$ 6.67

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Reverse Recapitalization - Schedule of outstanding common stock (Details) - shares		3 Months Ended
	Mar. 26, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Reverse Recapitalization
Common stock, shares outstanding		47,611,000		24,166,000
Common stock issued		1,421,715	678,462
Total common stock issued and outstanding	45,833,000	47,611,000		24,166,000
Sponsor Earnout Shares
Reverse Recapitalization
Sponsor earnout common stock outstanding prior to the Business Combination	8,625,000
PIPE financing
Reverse Recapitalization
Common stock issued	4,530,000
Concord III
Reverse Recapitalization
Common stock, shares outstanding	3,941,000
Less: redemption of Concord I I I's common stock	(3,766,000)
Common stock of Concord I I I issued and outstanding	8,800,000
Legacy G C T
Reverse Recapitalization
Legacy GCT common stock	32,503,000

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Reverse Recapitalization - Reverse Recapitalization - Additional Information (Details)	Mar. 26, 2024 USD ($)
Concord III | Legacy G C T
Reverse Recapitalization
Goodwill and intangible assets	$ 0

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Reverse Recapitalization - PIPE Financing - Additional Information (Details) - PIPE financing $ / shares in Units, $ in Millions	Mar. 26, 2024 USD ($) $ / shares shares
Reverse Recapitalization
Number of shares issued | shares	4,529,967
Issue price per share | $ / shares	$ 6.67
Value of shares issued	$ 30.2
Net proceeds from PIPE financing	$ 17.1

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Reverse Recapitalization -Private Warrants and Public warrants - Additional Information (Details) - shares	1 Months Ended	9 Months Ended
	Nov. 30, 2021	Sep. 30, 2024
Reverse Recapitalization
Number of warrants issued		26,273,000
Concord III | Private placement warrants
Reverse Recapitalization
Number of warrants issued	9,400,000
Concord III | Public warrants
Reverse Recapitalization
Number of warrants issued	17,250,000
Legacy G C T | Private placement and public warrants | Sponsor
Reverse Recapitalization
Number of warrants vested and retained	4,492,650
Number of warrants reallocated to others	2,087,350
Number of warrants forfeited	2,820,000

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Reverse Recapitalization - Legacy GCT and Sponsor Earn out Shares - Additional Information (Details) - Legacy G C T - USD ($)		1 Months Ended
	Mar. 26, 2024	Jul. 31, 2024
Earnout shares
Reverse Recapitalization
Number of shares issued	20,000,000
Threshold trading days calculated for issuing shares	20 days
Consecutive threshold trading days calculated for issuing shares	30 days
Fair value of shares issued	$ 108,800,000
Earnout shares | VWAP of the Company's common stock equals or exceeds $12.50 per share
Reverse Recapitalization
Number of shares issued	6,666,666
Threshold VWAP of stock to trigger earn out shares	$ 12.5
Earnout shares | VWAP of the Company's common stock equals or exceeds $15.00 per share
Reverse Recapitalization
Number of shares issued	6,666,667
Threshold VWAP of stock to trigger earn out shares	$ 15
Earnout shares | VWAP of the Company's common stock equals or exceeds $17.50 per share
Reverse Recapitalization
Number of shares issued	6,666,667
Threshold VWAP of stock to trigger earn out shares	$ 17.5
Sponsor Earnout Shares
Reverse Recapitalization
Number of shares issued	1,920,375
Threshold trading days calculated for issuing shares	20 days
Consecutive threshold trading days calculated for issuing shares	30 days
Fair value of shares issued	$ 10,400,000
Market based vesting common stock reduced shares		570,796
Remaining outstanding common stock shares		1,349,579
Adjustments to stockholders' deficit		$ 0
Sponsor Earnout Shares | VWAP of the Company's common stock equals or exceeds $12.50 per share
Reverse Recapitalization
Number of shares issued	640,125
Threshold VWAP of stock to trigger earn out shares	$ 12.5
Sponsor Earnout Shares | VWAP of the Company's common stock equals or exceeds $15.00 per share
Reverse Recapitalization
Number of shares issued	640,125
Threshold VWAP of stock to trigger earn out shares	$ 15
Sponsor Earnout Shares | VWAP of the Company's common stock equals or exceeds $17.50 per share
Reverse Recapitalization
Number of shares issued	640,125
Threshold VWAP of stock to trigger earn out shares	$ 17.5

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Disaggregation of Revenue - Schedule of Disaggregation of Revenues from Contracts with Customers and Categorized by Customer Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue
Revenues from contracts with customers	$ 2,610	$ 4,476	$ 7,343	$ 11,839
South Korea
Disaggregation of Revenue
Revenues from contracts with customers	1,500	4	3,500	3,010
United States
Disaggregation of Revenue
Revenues from contracts with customers	837	572	2,565	2,888
Germany
Disaggregation of Revenue
Revenues from contracts with customers	46	353	916	353
China
Disaggregation of Revenue
Revenues from contracts with customers	32	3,567	167	5,133
Other
Disaggregation of Revenue
Revenues from contracts with customers	$ 195	$ (20)	$ 195	$ 455

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Disaggregation of Revenue - Contract assets and liabilities - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Contract assets	$ 5.1	$ 3.4
Contract liabilities			$ 0.7
Contract liabilities related to contract fulfillment	0.5
Maximum
Disaggregation of Revenue [Line Items]
Contract liabilities	$ 0.1

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Fair Value of Measurements - Schedule of Financial Instruments are Measured at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value of Measurements
Convertible promissory notes	$ 8,838	$ 34,033
Warrant liabilities	3,197
Common stock forward liability	451
Level 3
Fair Value of Measurements
Convertible promissory notes	8,838	$ 34,033
Warrant liabilities	3,197
Common stock forward liability	$ 451

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Fair Value of Measurements - Schedule of Valuation Techniques and Inputs Used in the Fair Value Measurement (Details) - Level 3 - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Convertible Promissory Notes, Current | Discounted Cash Flow Model ("DCF")
Fair Value of Measurements
Fair value	$ 4,008
Convertible Promissory Notes, Current | PWERM
Fair Value of Measurements
Fair value		$ 27,794
Common Stock Forward Liability | Discounted Cash Flow Model ("DCF")
Fair Value of Measurements
Fair value	451
Convertible Promissory Notes, Net of Current | PWERM
Fair Value of Measurements
Fair value		$ 6,239
Convertible Promissory Notes, Net of Current | Binomial Lattice Model ("BLM")
Fair Value of Measurements
Fair value	4,830
Warrant Liabilities - Private and Public Warrants | Black Scholes Merton Model ("BSM") or BLM
Fair Value of Measurements
Fair value	$ 3,197

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Fair Value of Measurements - Additional Information (Details)	Sep. 30, 2024 shares yr
Stock Price | Convertible Promissory Notes, Net of Current | Binomial Lattice Model ("BLM")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input | shares	3.35
Discount Factor | Convertible Promissory Notes, Current | Discounted Cash Flow Model ("DCF")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	0.1007
Remaining Term | Convertible Promissory Notes, Current | Discounted Cash Flow Model ("DCF") | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	0.08
Remaining Term | Convertible Promissory Notes, Current | Discounted Cash Flow Model ("DCF") | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	0.25
Remaining Term | Convertible Promissory Notes, Net of Current | Binomial Lattice Model ("BLM")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	1.4
Credit Spread | Convertible Promissory Notes, Net of Current | Binomial Lattice Model ("BLM")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	0.056
Exercise Price | Binomial Lattice Model ("BLM") | Public warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input | shares	11.50
Exercise Price | Black Scholes Merton Model ("BSM") or BLM | Private placement warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input | shares	11.50
Exercise Price | Black Scholes Merton Model ("BSM") or BLM | Minimum | Warrant liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input | shares	10.00
Exercise Price | Black Scholes Merton Model ("BSM") or BLM | Maximum | Warrant liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input | shares	18.75
Term to Expiration | Binomial Lattice Model ("BLM") | Public warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	4.5
Term to Expiration | Black Scholes Merton Model ("BSM") or BLM | Private placement warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	4.5
Term to Expiration | Black Scholes Merton Model ("BSM") or BLM | Minimum | Warrant liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	1.41
Term to Expiration | Black Scholes Merton Model ("BSM") or BLM | Maximum | Warrant liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	2.1
Term to Expiration | Common Stock Forward Liability | Discounted Cash Flow Model ("DCF")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Remaining term, measurement input	1.6
Volatility | Black Scholes Merton Model ("BSM") or BLM | Private placement warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	0.355
Volatility | Black Scholes Merton Model ("BSM") or BLM | Minimum | Warrant liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	0.381
Volatility | Black Scholes Merton Model ("BSM") or BLM | Maximum | Warrant liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	0.390
Volatility | Convertible Promissory Notes, Net of Current | Binomial Lattice Model ("BLM")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	0.355
Risk-Free Rate | Black Scholes Merton Model ("BSM") or BLM | Private placement warrants
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	0.0355
Risk-Free Rate | Black Scholes Merton Model ("BSM") or BLM | Minimum | Warrant liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	0.0362
Risk-Free Rate | Black Scholes Merton Model ("BSM") or BLM | Maximum | Warrant liabilities - other
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input	0.0381
Risk-Free Rate | Convertible Promissory Notes, Net of Current | Binomial Lattice Model ("BLM")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible promissory notes, measurement input	0.0385
Risk-Free Rate | Common Stock Forward Liability | Discounted Cash Flow Model ("DCF") | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Remaining term, measurement input	0.0378
Risk-Free Rate | Common Stock Forward Liability | Discounted Cash Flow Model ("DCF") | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Remaining term, measurement input	0.0493

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Fair Value of Measurements - Schedule of Changes in the Fair Value of the Company's Level 3 Financial Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024
Fair Value of Measurements
Change in fair value, [Extensible List]	Other income (expenses), net	Other income (expenses), net	Other income (expenses), net
Convertible Promissory Notes
Fair Value of Measurements
Fair value as of beginning of period	$ 9,673	$ 10,317	$ 34,033
Conversion			(41,209)
Borrowing			16,290
Repayment	(1,000)	(630)
Change in fair value	165	(14)	1,203
Fair value as of end of period	8,838	9,673	10,317
Warrant Liabilities
Fair Value of Measurements
Fair value as of beginning of period	3,956	10,584
Fair value of warrants assumed at closing			5,958
Change in fair value	(759)	(6,628)	4,626
Fair value as of end of period	3,197	3,956	$ 10,584
Common Stock Forward Liability
Fair Value of Measurements
Fair value as of beginning of period	535
Conversion	(84)	(51)
Change in fair value		586
Fair value as of end of period	$ 451	$ 535

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Balance Sheet Components - Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Inventory, Net [Abstract]
Raw materials	$ 1,247	$ 448
Work-in-process	504	601
Finished goods	1,359	437
Total inventory	$ 3,110	$ 1,486

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Balance Sheet Components - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Balance Sheet Components [Abstract]
Write-downs of inventory	$ 0	$ 0

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Balance Sheet Components - Prepaid Expenses and Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Balance Sheet Components [Abstract]
Prepaid expenses	$ 1,372	$ 433
Prepaid insurance	566
Prepaid research and development	565
Prepaid inventory	524	279
Lease deposit	422	434
Other receivables and current assets	96	117
Deferred transaction costs		1,643
Total prepaid expenses and other current assets	$ 3,545	$ 2,906

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Balance Sheet Components - Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Balance Sheet Components [Abstract]
Payroll and related expenses	$ 9,126	$ 9,880
Accrued payables	6,764	6,319
Other taxes payable	3,191	158
Current portion of interest payable	2,560	6,915
Professional fees	548	499
Product warranty liabilities	37	55
Royalty and license fee	43	58
Other	96	72
Total accrued and other current liabilities	$ 22,365	$ 23,956

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Debt - Outstanding debt (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Borrowings
Borrowings	$ 41,819	$ 79,856
Fair Value	41,657	78,542
Less: current portion	(36,827)	(72,303)
Debt, net of current portion	4,830	6,239
Convertible promissory notes
Borrowings
Borrowings	9,000	35,347
Fair Value	8,838	34,033
Historical convertible promissory notes
Borrowings
Borrowings	4,000	35,347
Fair Value	4,008	34,033
2024 convertible promissory note
Borrowings
Borrowings	5,000
Fair Value	4,830
Borrowings
Borrowings
Borrowings	32,819
Borrowings | KEB Hana Bank
Borrowings
Borrowings	6,820	6,980
Fair Value	6,820	6,980
Borrowings | IBK Industrial Bank
Borrowings
Borrowings	6,972	7,135
Fair Value	6,972	7,135
Borrowings | Note payable (one individual investor)
Borrowings
Borrowings		1,000
Fair Value		1,000
Borrowings | Mujin Electronics Co., Ltd.
Borrowings
Borrowings	3,789
Fair Value	3,789
Borrowings | M-Venture Investment, Inc.
Borrowings
Borrowings		7,756
Fair Value		7,756
Borrowings | Anapass, Inc, related party
Borrowings
Borrowings	9,851	10,082
Fair Value	9,851	10,082
Borrowings | i Best Investment Co., Ltd
Borrowings
Borrowings	4,546	10,082
Fair Value	4,546	10,082
Borrowings | Kyeongho Lee
Borrowings
Borrowings	841	1,474
Fair Value	$ 841	$ 1,474

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Debt - Expected future minimum principal payments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Borrowings
2024, remainder	$ 11,813
2025	25,006
2026	5,000
Total debt	41,819	$ 79,856
Convertible Notes
Borrowings
2024, remainder	4,000
2025	0
2026	5,000
Total debt	9,000
Borrowings
Borrowings
2024, remainder	7,813
2025	25,006
Total debt	$ 32,819

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Debt - Convertible Promissory Notes - Additional Information (Details)	1 Months Ended		2 Months Ended	9 Months Ended
	Apr. 30, 2024 USD ($)	Mar. 31, 2024 USD ($) shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2024 USD ($) Item $ / shares shares	Feb. 29, 2024 USD ($)	Dec. 31, 2023 USD ($)
Borrowings
Amount outstanding			$ 41,819,000	$ 41,819,000		$ 79,856,000
Repayment of convertible net				1,630,000
Historical convertible promissory notes
Borrowings
Amount of debt converted		$ 32,100,000
Number of shares issued on conversion of debt | shares		4,258,223
Amount of principal and interest outstanding			$ 5,900,000	$ 5,900,000
Number of noteholders | Item				1
Conversion price | $ / shares			$ 3.5	$ 3.5
Amount outstanding			$ 4,000,000	$ 4,000,000		$ 35,347,000
Repayment of convertible net	$ 600,000		$ 1,000,000	$ 5,100,000
Historical convertible promissory notes | Minimum
Borrowings
Interest rate (as a percent)			4.00%	4.00%
Historical convertible promissory notes | Maximum
Borrowings
Interest rate (as a percent)			7.00%	7.00%
Historical convertible promissory notes | Strategic investor
Borrowings
Conversion price | $ / shares			$ 10	$ 10
2023 & 2024 convertible promissory notes
Borrowings
Number of shares issued on conversion of debt | shares		2,004,535
Repayment of convertible net		$ 13,400,000
2023 & 2024 convertible promissory notes | CVT Investors
Borrowings
Principal amount			$ 13,300,000	$ 13,300,000
Interest rate (as a percent)			5.00%	5.00%
Conversion price | $ / shares			$ 6.67	$ 6.67
Amount outstanding			$ 0	$ 0
2023 & 2024 convertible promissory notes | Strategic investor
Borrowings
Principal amount					$ 5,000,000
Interest rate (as a percent)			5.00%	5.00%
Number of shares issued on conversion of debt | shares				10
Term for conversion				6 months

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Debt - Borrowings Pursuant to Term Loan and Security Agreements - Additional Information (Details) $ in Thousands, ₩ in Millions	1 Months Ended									3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2024 USD ($)	Jul. 31, 2024 KRW (₩)	Jun. 30, 2024 USD ($)	Apr. 30, 2024 USD ($)	Apr. 30, 2024 KRW (₩)	Mar. 31, 2024 USD ($)	Mar. 31, 2024 KRW (₩)	Dec. 31, 2023 USD ($)	Jul. 31, 2016 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 KRW (₩)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 KRW (₩)	Dec. 31, 2017 USD ($)	Jul. 31, 2024 KRW (₩)	Apr. 30, 2024 KRW (₩)	Dec. 31, 2023 KRW (₩)	Dec. 31, 2022 KRW (₩)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 KRW (₩)	May 31, 2022 USD ($)	May 31, 2022 KRW (₩)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 KRW (₩)	Dec. 31, 2021 KRW (₩)	Oct. 31, 2021 USD ($)	Oct. 31, 2021 KRW (₩)	Jun. 30, 2021 USD ($)	Dec. 31, 2017 KRW (₩)	Jan. 31, 2017 USD ($)	Jan. 31, 2017 KRW (₩)	Jul. 31, 2016 KRW (₩)
Borrowings
Amount outstanding								$ 79,856				$ 41,819
Amount repaid												14,065	$ 23
Borrowings
Borrowings
Amount outstanding												32,819
KEB Hana Bank | Borrowings
Borrowings
Principal amount									$ 6,700																									₩ 9,000.0
Annual interest rate									2.60%
Additional extension term (in years)																1 year
Principal amount of loan extended maturity date				$ 700														₩ 1,000.0
Amount outstanding								6,980				$ 6,820
KEB Hana Bank | Borrowings | Minimum
Borrowings
Annual interest rate			3.50%
KEB Hana Bank | Borrowings | Maximum
Borrowings
Annual interest rate			5.20%
IBK Industrial Bank | Borrowings
Borrowings
Principal amount	$ 6,000																₩ 8,000.0															$ 6,800	₩ 9,200.0
Interest rate (as a percent)	4.90%			3.50%								4.90%					4.90%	3.50%
Amount outstanding								7,135				$ 6,972
Note payable (one individual investor) | Borrowings
Borrowings
Principal amount																														$ 1,000
Interest rate (as a percent)			4.00%
Amount outstanding								1,000
M-Venture Investment, Inc. | Borrowings
Borrowings
Amount outstanding								7,756
M-Venture Investment, Inc. | Term loan and security agreement, one
Borrowings
Principal amount																												$ 3,700	₩ 5,000.0
Interest rate (as a percent)												6.50%
Amount outstanding														$ 3,000						₩ 4,000.0
Amount repaid				$ 1,500	₩ 2,000.0					$ 400	₩ 600.0			300	₩ 400.0
M-Venture Investment, Inc. | Term loan and security agreement, two, draw one
Borrowings
Principal amount																									$ 700	₩ 1,000.0
Interest rate (as a percent)												6.50%
Principal amount of loan extended maturity date				700														₩ 1,000.0
M-Venture Investment, Inc. | Term loan and security agreement, two, draw two
Borrowings
Principal amount																									$ 3,700	₩ 5,000.0
Interest rate (as a percent)												8.70%
Principal amount of loan extended maturity date				$ 3,700														₩ 5,000.0
M-Venture Investment, Inc. | Term loans
Borrowings
Repayment of short term loan	$ 700	₩ 1,000.0
Mujin Electronics Co., Ltd. | Borrowings
Borrowings
Amount outstanding												$ 3,789
Mujin Electronics Co., Ltd. | Term loan and security agreement, one
Borrowings
Principal amount	$ 3,700																₩ 5,000.0
Interest rate (as a percent)	6.80%																6.80%
Anapass, Inc, related party | Borrowings
Borrowings
Amount outstanding								10,082				$ 9,851
Anapass, Inc, related party | Term loan and security agreement, one
Borrowings
Principal amount									$ 4,500																									₩ 6,000.0
Interest rate (as a percent)									5.50%																									5.50%
Anapass, Inc, related party | Term loan and security agreement, two
Borrowings
Interest rate (as a percent)												5.50%
Anapass, Inc, related party | Term loan and security agreement, two, draw one
Borrowings
Principal amount																							$ 2,200	₩ 3,000.0
Anapass, Inc, related party | Term loan and security agreement, two, draw two
Borrowings
Principal amount																					$ 3,000	₩ 4,000.0
i Best Investment Co., Ltd | Borrowings
Borrowings
Principal amount								$ 10,300						$ 10,300					₩ 14,000.0	₩ 14,000.0
Interest rate (as a percent)								6.50%						6.50%					6.50%	6.50%
Amount outstanding								$ 10,082				$ 4,546
i Best Investment Co., Ltd | Term loan and security agreement, draw two
Borrowings
Amount repaid								800
i Best Investment Co., Ltd | Term loan and security agreement, draw three
Borrowings
Amount repaid			$ 1,400
i Best Investment Co., Ltd | Term loan and security agreement, draw four
Borrowings
Amount repaid						$ 2,300
Kyeongho Lee | Borrowings
Borrowings
Amount outstanding								$ 1,474				$ 841
Kyeongho Lee | Promissory notes
Borrowings
Principal amount										$ 400						$ 400											₩ 500.0				₩ 500.0
Kyeongho Lee | Promissory notes | Minimum
Borrowings
Interest rate (as a percent)										7.50%						7.50%											7.50%				7.50%
Kyeongho Lee | Promissory notes | Maximum
Borrowings
Interest rate (as a percent)										9.00%						9.00%											9.00%				9.00%
Kyeongho Lee | Term loans
Borrowings
Principal amount										$ 100						$ 700											₩ 110.0				₩ 1,000.0
Amount repaid						$ 700	₩ 1,000.0

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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Feb. 29, 2024	Dec. 31, 2023
Purchase Commitment
Research and development expense	$ 4,210	$ 2,367	$ 13,895	$ 7,254
Unpaid recorded expenses included in accounts payable	1,070		1,070			$ 17,814
Borrowings	41,819		41,819			79,856
KEB Hana Bank | Assets pledged as collateral | Borrowings | Related party
Purchase Commitment
Borrowings	6,800		6,800			7,000
IBK Industrial Bank | Assets pledged as collateral | Borrowings | Related party
Purchase Commitment
Borrowings	7,000		7,000			7,100
Anapass, Inc. | Assets pledged as collateral | Borrowings | Related party
Purchase Commitment
Borrowings	9,900		9,900			$ 10,100
Research and development agreement with Samsung
Purchase Commitment
Outstanding purchase commitments	200		200
Total fee amount	21,100		21,100
Fee amount to be paid over development milestones	11,700		11,700
Additional NRE to be paid as fee amount	9,400		$ 9,400
Period for payment of additional NRE			4 years
Gain on release of unconditional liability			$ 14,600
Research And Development Agreement With Alpha Holdings Co., Ltd
Purchase Commitment
Total fee amount					$ 7,600
Research and development expense	1,200		6,000
Aggregated unpaid amount	$ 4,900		$ 4,900

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Commitments and Contingencies - Schedule of Carrying Amounts Related to Collateral Provided to Anapass, Inc (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Borrowings
Cash and cash equivalents	$ 1,812	$ 258
Accounts receivable	6,441	4,920
Inventory	3,110	1,486
Property and equipment	641	772
Anapass, Inc. | Related party | Assets pledged as collateral | Borrowings
Borrowings
Cash and cash equivalents	1,732	254
Accounts receivable	6,447	4,920
Inventory	3,110	1,486
Property and equipment	206	352
Intangible assets and others	$ 884	$ 199

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Common Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2024	Apr. 30, 2024	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2024	Mar. 31, 2024
Common Stock
Common stock forward liability	$ 451	$ 600	$ 451		$ 451
Commitment shares					56,818
Reimbursement of commitment amount					$ 250
Common stock issued			1,421,715	678,462
Shares issued values			$ 5,541	$ 3,388
Amount withheld for outstanding payables			500	500
Proceeds from issuance of common stock under common stock purchase agreement			$ 5,000	2,800	$ 7,814
Issuance of common stock to underwriter (in shares)		110,000
Issuance of common stock to underwriter				667
Private Placement
Common Stock
Common stock issued	741,603
Shares issued values	$ 2,000
Proceeds from issuance of private placement	$ 2,200
Private Placement | Common stock warrants
Common Stock
Common stock issued	148,320
Shares issued values	$ 200
Exercise price of warrants	$ 3.02		$ 3.02		$ 3.02
Warrants term	5 years		5 years		5 years
B. Riley Principal Capital II, LLC
Common Stock
Stock Sale Commitment Amount						$ 50,000
Percentage of volume weighted average price					98.00%
Shares issued values			$ 5,500	$ 3,300
B. Riley Principal Capital II, LLC | Maximum
Common Stock
Stock Sale Commitment Amount	$ 50,000		$ 50,000		$ 50,000

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Common Stock - Common Stock Reserved for Issuance - Additional Information (Details) - shares	Sep. 30, 2024	Dec. 31, 2023
Common Stock
Total Shares Authorized	440,000,000
Common Stock, Shares Authorized	400,000,000	200,000,000
Preferred Stock, Shares Authorized	40,000,000	82,352,000

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Common Stock - Common Stock Reserved for Issuance (Details) - shares shares in Thousands	Sep. 30, 2024	Dec. 31, 2023
Common Stock
Shares of authorized but unissued common stock	52,509	5,902
Options issued and outstanding
Common Stock
Shares of authorized but unissued common stock	550	668
RSUs Outstanding
Common Stock
Shares of authorized but unissued common stock	611	392
Shares available for future grant from 2024 plan
Common Stock
Shares of authorized but unissued common stock	3,762
Shares available for future grant from 2024 ESPP
Common Stock
Shares of authorized but unissued common stock	600
Shares available for future grant from 2011 plan
Common Stock
Shares of authorized but unissued common stock		113
Common stock warrants
Common Stock
Shares of authorized but unissued common stock	26,273	2,894
Legacy GCT Earnout Shares
Common Stock
Shares of authorized but unissued common stock	20,000
Convertible promissory notes
Common Stock
Shares of authorized but unissued common stock	713	1,835

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Warrants (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Warrants
Number of warrants issued | shares	26,273
February 2023 ~ June 2023
Warrants
Number of warrants issued | shares	2,115
February 2023 ~ June 2023 | Maximum
Warrants
Exercise price of warrants | $ / shares	$ 18.75
February 2023 ~ June 2023 | Minimum
Warrants
Exercise price of warrants | $ / shares	$ 10.00
July 2023
Warrants
Number of warrants issued | shares	80
Exercise price of warrants | $ / shares	$ 10.00
October 2023
Warrants
Number of warrants issued | shares	100
Exercise price of warrants | $ / shares	$ 10.00
Public And Private Placement Warrants
Warrants
Number of warrants issued | shares	23,830
Exercise price of warrants | $ / shares	$ 11.50
September 2024
Warrants
Number of warrants issued | shares	148
Exercise price of warrants | $ / shares	$ 3.02

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2021
Stock-Based Compensation
Granted during the period (in shares)				0
Exercisable - Aggregate Intrinsic Value		$ 1,729		$ 1,729
Exercised during the period (in shares)				117,670
Options exercised, intrinsic value		300
Additional shares of common stock reserved for issuance (in shares)						90,000
Stock-based compensation	$ 900	$ 573	$ 3	$ 2,119	$ 8
2024 Incentive Compensation Plan
Stock-Based Compensation
Number of shares of common stock reserved for issuance (in shares)	3,983,334

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Stock-Based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Number of Options Outstanding
Balance as of beginning (in shares)	3,579,000
Exercised (in shares)	(117,670)
Balance as of end (in shares)	550,000	3,579,000
Vested and expected to vest as of end (in shares)	550,000
Exercisable as of end (in shares)	533,000
Weighted-Average Exercise Price
Balance as of beginning (in dollars per share) | $ / shares	$ 0.02
Exercised (in dollars per share) | $ / shares	0.11
Balance as of end (in dollars per share) | $ / shares	0.11	$ 0.02
Vested and expected to vest as of end (in dollars per share) | $ / shares	0.11
Exercisable as of end (in dollars per share) | $ / shares	$ 0.11
Weighted Average Remaining Contractual Life (Years)
Outstanding - Weighted Average Remaining Contractual Life (in years)	4 years 7 months 6 days	5 years 6 months
Vested and expected to vest - Weighted Average Remaining Contractual Life (in years)	4 years 7 months 6 days
Exercisable - Weighted Average Remaining Contractual Life (in years)	4 years 6 months
Balance outstanding - Aggregate Intrinsic Value | $	$ 1,785	$ 4,045
Vested and expected to vest - Aggregate Intrinsic Value | $	1,785
Exercisable - Aggregate Intrinsic Value | $	$ 1,729
Retrospectively Adjusted
Number of Options Outstanding
Balance as of beginning (in shares)	668,000
Reverse recapitalization (in shares)		(2,911,000)
Balance as of end (in shares)		668,000
Weighted-Average Exercise Price
Balance as of beginning (in dollars per share) | $ / shares	$ 0.11
Reverse recapitalization (in dollars per share)		0.09
Balance as of end (in dollars per share) | $ / shares		$ 0.11
Weighted Average Remaining Contractual Life (Years)
Outstanding - Weighted Average Remaining Contractual Life (in years)		5 years 6 months
Balance outstanding - Aggregate Intrinsic Value | $		$ 4,045

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Stock-Based Compensation - Summary of RSUs Activity (Details) - RSU - $ / shares shares in Thousands	1 Months Ended	9 Months Ended
	Jun. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Number of Shares
Balance at the beginning		2,100
Granted	700	221
Cancelled		(2)
Balance at the end		611
Weighted Average shares
Balance at beginning (in dollars per share)		$ 1.15
Granted ( in dollars per share)		3.69
Cancelled( in dollars per share)		6.16
Balance at end (in dollars per share)		$ 5.26
Retrospectively Adjusted
Number of Shares
Balance at the beginning		392
Reverse capitalization			(1,708)
Weighted Average shares
Balance at beginning (in dollars per share)		$ 6.16
Reverse capitalization (in dollars per share)			$ 5.01

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Stock-Based Compensation - Restricted Stock Units - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Stock-Based Compensation
Granted						0
Stock-based compensation			$ 900	$ 573	$ 3	$ 2,119	$ 8
Common Stock
Stock-Based Compensation
Closing price of company's common stock						80,916
RSUs Outstanding
Stock-Based Compensation
Unrecognized compensation cost related to RSUs				2,300		$ 2,300
Expected weighted average period for recognition of unrecognized compensation cost related to RSUs (in years)						3 years
Share based fixed monetary amount		700,000				221,000
Granted	140,000							392,000
Stock-based compensation				$ 600		$ 1,200

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Stock-Based Compensation - Schedule of Stock-Based Compensation Allocation (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Stock-Based Compensation
Stock-based compensation	$ 900	$ 573	$ 3	$ 2,119	$ 8
Cost of revenues
Stock-Based Compensation
Stock-based compensation		33		33
Research and Development
Stock-Based Compensation
Stock-based compensation		135	1	389	3
Sales and Marketing
Stock-Based Compensation
Stock-based compensation		36	1	108	3
General and Administrative
Stock-Based Compensation
Stock-based compensation		$ 369	$ 1	$ 1,589	$ 2

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Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Taxes
Income tax expense	$ 61,000	$ 38,000	$ 187,000	$ 125,000
Effective tax rate (in %)			(2.60%)	(1.00%)
Unrecognized tax benefits	3,100,000		$ 3,100,000
Unrecognized tax benefits that would impact the effective tax rate if recognized	1,700,000		1,700,000
Unrecognized tax benefits - Interest expense or penalties accrued	$ 0		$ 0

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Employee Benefit Plans - Summary of net liability for severance payments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Employee Benefit Plans
Liability for severance payments, gross	$ 8,328	$ 7,997
Plan assets	(276)	(308)
Liability for severance payments, net	$ 8,052	$ 7,689

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Related Party Transactions - Summary of Balances and Transactions with the Related Parties (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Related Party Transactions
Other current liabilities	$ 96	$ 72
Related party | Anapass
Related Party Transactions
Borrowings	9,851	10,082
Other current liabilities	9	212
Related party | Kyeongho Lee
Related Party Transactions
Borrowings	841	1,474
Other current liabilities	$ 86	$ 182

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Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Related Party Transaction [Line Items]
Interest expense	$ 667	$ 1,220	$ 3,509	$ 4,878
Related Party [Member] | Anapass [Member]
Related Party Transaction [Line Items]
Interest expense	$ 100	$ 100	$ 400	$ 400

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Segments and Information - Additional information (Details)	9 Months Ended
	Sep. 30, 2024 Segment
Segments and Information
Number of operating segment	1

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Segments and Information - Summary of Long-lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Segments and Information
Total tangible long-lived assets	$ 1,706	$ 2,293
South Korea
Segments and Information
Total tangible long-lived assets	1,041	1,363
United States
Segments and Information
Total tangible long-lived assets	$ 665	$ 930

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Net Loss Per Share - Schedule of Potentially Dilutive Common Stock Equivalents that were Excluded From the Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Net Loss Per Share
Potentially dilutive common stock equivalents that were excluded from the computation of diluted net loss per common share (in shares)	48,718	4,690
Warrants
Net Loss Per Share
Potentially dilutive common stock equivalents that were excluded from the computation of diluted net loss per common share (in shares)	26,273	2,214
Legacy GCT
Net Loss Per Share
Potentially dilutive common stock equivalents that were excluded from the computation of diluted net loss per common share (in shares)	20,000
Sponsor Earnout Shares
Net Loss Per Share
Potentially dilutive common stock equivalents that were excluded from the computation of diluted net loss per common share (in shares)	571
Convertible promissory notes
Net Loss Per Share
Potentially dilutive common stock equivalents that were excluded from the computation of diluted net loss per common share (in shares)	713	1,806
Options issued and outstanding
Net Loss Per Share
Potentially dilutive common stock equivalents that were excluded from the computation of diluted net loss per common share (in shares)	550	670
RSU
Net Loss Per Share
Potentially dilutive common stock equivalents that were excluded from the computation of diluted net loss per common share (in shares)	611

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Subsequent Events (Details) $ in Thousands, ₩ in Millions	1 Months Ended			2 Months Ended	3 Months Ended		9 Months Ended
	Nov. 30, 2024 USD ($)	Oct. 31, 2024 USD ($) shares	Apr. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 USD ($) shares	Jun. 30, 2024 USD ($) shares	Sep. 30, 2024 USD ($)	Nov. 30, 2024 KRW (₩)	Oct. 31, 2024 KRW (₩)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 KRW (₩)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 KRW (₩)
Subsequent Event [Line Items]
Repayments of convertible promissory notes							$ 1,630
Issuance of common stock under common stock purchase agreement (in shares) | shares					1,421,715	678,462
Proceeds from issuance of common stock under common stock purchase agreement					$ 5,000	$ 2,800	7,814
Historical convertible promissory notes
Subsequent Event [Line Items]
Repayments of convertible promissory notes			$ 600	$ 1,000			$ 5,100
Mujin Electronics Co., Ltd.
Subsequent Event [Line Items]
Maturity date description							In October 2024, the Company executed an amendment with Mujin Electronics Co., Ltd. to extend the maturity date of KRW 5.0 billion ($3.7 million) loan from January 2025 to June 2025.
i Best Investment Co., Ltd.
Subsequent Event [Line Items]
Maturity date description							In October 2024, the Company executed an amendment with i Best Investment Co., Ltd. to extend the maturity date from February 2025 to May 2025 for its sixth draw.
Kyeongho Lee | Term loans
Subsequent Event [Line Items]
Principal amount										$ 100	₩ 110.0	$ 700	₩ 1,000.0
Subsequent event
Subsequent Event [Line Items]
Issuance of common stock under common stock purchase agreement (in shares) | shares		103,596
Proceeds from issuance of common stock under common stock purchase agreement		$ 300
Subsequent event | Historical convertible promissory notes
Subsequent Event [Line Items]
Repayments of convertible promissory notes		1,000
Subsequent event | Mujin Electronics Co., Ltd. | Term loans
Subsequent Event [Line Items]
Term loan outstanding		$ 3,700							₩ 5,000.0
Subsequent event | Kyeongho Lee | Term loans
Subsequent Event [Line Items]
Principal amount	$ 2,900							₩ 4,000.0
Loan maturity date	Dec. 31, 2024
Annual interest rate	12.00%