Cover page - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 21, 2020	Jun. 30, 2019
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-35444
Entity Registrant Name	YELP INC
Entity Central Index Key	0001345016
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	true
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-1854266
Entity Address, Address Line One	140 New Montgomery Street, 9th Floor
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	415
Local Phone Number	908-3801
Title of 12(b) Security	Common Stock, par value $0.000001 per share
Trading Symbol	YELP
Security Exchange Name	NYSE
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			$ 1,991,454,326
Entity Common Stock, Shares Outstanding		71,839,649
Documents Incorporated by Reference	None.
Amendment Description	We are filing this Amendment No. 1 to our Annual Report on Form 10-K/A (the "Amendment") to amend our Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the U.S. Securities and Exchange Commission (the "SEC") on February 28, 2020 (the "Original Filing"). The purpose of this Amendment is to include the Part III information that was to be incorporated by reference to the Proxy Statement for our 2020 Annual Meeting of Stockholders. This Amendment hereby amends Part III, Items 10 through 14, and Part IV, Item 15. As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), new certifications by our principal executive officer and principal financial officer are filed as exhibits to this Amendment. No attempt has been made in this Amendment to modify or update the other disclosures presented in the Original Filing. This Amendment does not reflect events occurring after the filing of the Original Filing or modify or update those disclosures that might be affected by subsequent events. Such subsequent matters are addressed in subsequent reports filed by us with the SEC. Accordingly, this Amendment should be read in conjunction with the Original Filing and our other filings with the SEC.Unless the context suggests otherwise, references in this Amendment to “Yelp,” the “Company,” “we,” “us” and “our” refer to Yelp Inc. and, where appropriate, its subsidiaries.