Cover
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2020
Current Fiscal Year End Date --12-31
Document Transition Report false
Entity Shell Company false
Entity File Number 001-39340
Entity Registrant Name Agora, Inc.
Entity Incorporation, State or Country Code E9
Entity Address, Address Line One Floor 8, Building 12
Entity Address, Address Line Two Phase III of ChuangZhiTianDi
Entity Address, Address Line Three 333 Songhu RoadYangpu District
Entity Address, City or Town Shanghai
Entity Address, Country CN
Title of 12(b) Security American depositary shares (each American depositary shares representing four Class A ordinary share, par value US$0.0001 each)
Trading Symbol API
Security Exchange Name NASDAQ
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status No
Entity Interactive Data Current Yes
Entity Filer Category Non-accelerated Filer
Entity Ex Transition Period false
ICFR Auditor Attestation Flag false
Document Accounting Standard U.S. GAAP
Entity Central Index Key 0001802883
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Amendment Flag false
Entity Emerging Growth Company true
Business Contact  
Document Information [Line Items]  
Contact Personnel Name Jingbo Wang
Entity Address, Address Line One Floor 8, Building 12
Entity Address, Address Line Two Phase III of ChuangZhiTianDi
Entity Address, Address Line Three 333 Songhu RoadYangpu District
Entity Address, City or Town Shanghai
Entity Address, Country CN
City Area Code 86-400
Local Phone Number 632-6626
Common Class A  
Document Information [Line Items]  
Title of 12(b) Security Class A ordinary shares, with a par value of US$0.0001 each*
Entity Common Stock, Shares Outstanding 347,302,624
Common Class B  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 76,179,938