Document And Entity Information - USD ($)	Dec. 31, 2020	Feb. 25, 2021	Jun. 30, 2020
Document Information [Line Items]
Entity, Registrant Name	Inphi Corporation
Current Fiscal Year End Date	--12-31
Document, Fiscal Period Focus	FY
Document, Fiscal Year Focus	2020
Document, Type	10-K/A
Document, Annual Report	true
Document, Period End Date	Dec. 31, 2020
Document, Transition Report	false
Entity, File Number	001-34942
Entity, Incorporation, State or Country Code	DE
Entity, Tax Identification Number	77-0557980
Entity, Address, Address Line One	110 Rio Robles
Entity, Address, City or Town	San Jose
Entity, Address, State or Province	CA
Entity, Address, Postal Zip Code	95134
City Area Code	408
Local Phone Number	217-7300
Title of 12(b) Security	Common Stock
Trading Symbol	IPHI
Security Exchange Name	NASDAQ
Entity, Well-known Seasoned Issuer	Yes
Entity, Voluntary Filers	No
Entity, Current Reporting Status	Yes
Entity, Interactive Data, Current	Yes
Entity, Filer Category	Large Accelerated Filer
Entity, Small Business	false
Entity, Emerging Growth Company	false
Entity, Shell Company	false
Entity, Public Float			$ 6,100,000,000
Entity, Common Stock Shares, Outstanding		53,672,718
Amendment Description	This Amendment No. 1 to Form 10-K (this “Amendment”) amends the Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “2020 Form 10-K”) originally filed on February 25, 2021 (the “Original Filing”) by Inphi Corporation, a Delaware corporation (“Inphi,” the “Company,” “we,” or “us”). We are filing this Amendment to present the information required by Part III of Form 10-K, and to update certain of the information included in the list of exhibits included in Item 15 and the Exhibit Index of this report. This Amendment hereby amends Part III, Items 10 through 14, and Part IV, Item 15(b) of the 2020 Form 10-K. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by the registrant’s principal executive officer and principal financial officer are filed as exhibits to this Amendment.
Amendment Flag	true
Entity, Central Index Key	0001160958

INPHI Corp 10-K/A