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Document And Entity Information - shares
 12 Months Ended
Dec. 31, 2020
Mar. 30, 2021
Document Information Line Items    
Entity Registrant Name Lion Group Holding Ltd.  
Trading Symbol LGHL  
Document Type 20-F/A  
Current Fiscal Year End Date --12-31  
Amendment Flag true  
Amendment Description This Amendment on Form 20-F/A is being filed by Lion Group Holding Ltd. as Amendment No. 1 to its annual report on Form 20-F for the fiscal year ended December 31, 2020, as filed with the Securities and Exchange Commission on March 31, 2021 (the “Original Filing”). As indicated under “Restatement Background” we have restated our audited 2020 financial statements to correct identified accounting errors related to the 2020 financial statements. This Amendment restates the Company's previously issued consolidated financial statements as of and for the year ended December 31, 2020. See Note 21 - Restatement of Previously Issued Audited and Unaudited Consolidated Financial Statements, in Item 17, Financial Statements, for additional information. This Amendment sets forth the 2020 consolidated financial statements, as restated to reflect these matters.  
Entity Central Index Key 0001806524  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Non-accelerated Filer  
Entity Well-known Seasoned Issuer No  
Document Period End Date Dec. 31, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus FY  
Entity Emerging Growth Company true  
Entity Shell Company false  
Entity Ex Transition Period false  
Document Registration Statement false  
Document Annual Report true  
Document Transition Report false  
Document Shell Company Report false  
Entity File Number 001-39301  
Entity Address, Postal Zip Code N/A  
Entity Incorporation, State or Country Code E9  
Entity Address, Address Line One Unit A-C, 33/F  
Entity Address, Address Line Two Tower A, Billion Center1 Wang Kwong Road  
Entity Address, City or Town Kowloon Bay  
Entity Address, Country HK  
Title of 12(b) Security Class A Ordinary Shares represented by American Depositary Shares (“ADSs”)  
Security Exchange Name NASDAQ  
Entity Interactive Data Current Yes  
Document Accounting Standard U.S. GAAP  
Class A Ordinary Shares    
Document Information Line Items    
Entity Common Stock, Shares Outstanding   27,191,830
Class B Ordinary Shares    
Document Information Line Items    
Entity Common Stock, Shares Outstanding   9,843,096
Business Contact    
Document Information Line Items    
Entity Address, Postal Zip Code 10168  
Entity Address, Address Line One 122 East 42nd Street  
Entity Address, Address Line Two 18th Floor  
Entity Address, City or Town New York  
Contact Personnel Name Cogency Global Inc.  
Entity Address, State or Province NY  
City Area Code (212)  
Local Phone Number 947-7200