Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2020	Apr. 15, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity File Number	001-33368
Entity Registrant Name	Glu Mobile Inc
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	91-2143667
Entity Address, Address Line One	875 Howard Street, Suite 100
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94103
City Area Code	415
Local Phone Number	800-6100
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	GLUU
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
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1,364,594,790
Entity Common Stock, Shares Outstanding		176,310,022
Entity Central Index Key	0001366246
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	true
AmendmentDescription	This Amendment No. 1 on Form 10-K/A (this “Amendment”) amends the Annual Report on Form 10-K of Glu Mobile Inc. (“Glu”) for the fiscal year ended December 31, 2020, originally filed with the Securities and Exchange Commission (the “SEC”) on February 26, 2021 (the “Original Filing”). We are filing this Amendment for the purpose of providing the information required by and not included in Part III of the Original Filing that was omitted from the Original Filing in reliance on General Instruction G(3) to Form 10-K because we no longer intend to file our definitive proxy statement for our 2021 Annual Meeting of Stockholders (the “Proxy Statement”) within 120 days after the end of our fiscal year ended December 31, 2020. Part IV of the Original Filing is being amended solely to add as exhibits certain new certifications in accordance with Rule 13a-14(a) promulgated by the SEC under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. The reference on the cover of the Original Filing to the incorporation by reference of the Proxy Statement into Part III of the Original Filing is hereby deleted. Except as expressly set forth in this Amendment, we are not amending any other part of the Original Filing. The Original Filing continues to speak as of the date of the Original Filing, and we have not updated the disclosures contained therein to reflect any events which occurred at a date subsequent to the filing of the Original Filing. This Amendment should be read in conjunction with the Original Filing and with any of our filings made with the SEC subsequent to filing of the Original Filing on Form 10-K. All references to “Company,” “Glu,” “Glu Mobile,” “we,” “us” or “our” are references to Glu Mobile Inc. and, where appropriate, its subsidiaries.

GLU MOBILE INC 10-K/A