Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Feb. 22, 2023	Jul. 01, 2022
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	000-25826
Entity Registrant Name	HARMONIC INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0201147
Entity Address, Address Line One	2590 Orchard Parkway
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	542-2500
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	HLIT
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 398.6
Entity Common Stock, Shares Outstanding		111,070,678
Documents Incorporated by Reference	Portions of the Proxy Statement for the Registrant’s 2023 Annual Meeting of Stockholders (which will be filed with the Securities and Exchange Commission within 120 days of the end of the fiscal year ended December 31, 2022) are incorporated by reference in Part III of this Annual Report on Form 10-K.
Amendment Flag	true
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0000851310
Amendment Description	Harmonic, Inc. (the “Company”) is filing this Amendment No. 1 (this “Amendment”) to its Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (the “Form 10-K”) solely to include Armanino LLP’s Report of Independent Registered Public Accounting Firm for the consolidated financial statements for the fiscal year ended December 31, 2020, which was inadvertently omitted in the as-filed version. The signed report was received by us prior to the original filing. No other changes have been made to the Form 10-K. Updated consents from each of Armanino LLP and Ernst & Young LLP dated as of the date of this Amendment are filed herewith as exhibits to this Amendment. This Amendment does not reflect events occurring after the filing of the Form 10-K, does not update disclosures contained in the Form 10-K and does not modify or amend the Form 10-K except as specifically described above. Pursuant to Rule 12b-15 of the Securities Exchange Act of 1934, as amended, this Amendment contains the complete text of Item 8. Financial Statements and certifications of the Company’s Principal Executive Officer and Principal Financial Officer required under Items 302 and 906 of the Sarbanes-Oxley Act of 2002, as amended, dated as of the date of this Amendment, as well as updated inline XBRL exhibits.