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Cover - shares
 6 Months Ended
Jun. 30, 2021
Aug. 11, 2021
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2021  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-31  
Entity File Number 001-34611  
Entity Registrant Name CELSIUS HOLDINGS, INC.  
Entity Central Index Key 0001341766  
Entity Tax Identification Number 20-2745790  
Entity Incorporation, State or Country Code NV  
Entity Address, Address Line One 2424 N Federal Highway  
Entity Address, Address Line Two Suite 208  
Entity Address, City or Town Boca Raton  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33431  
City Area Code 561  
Local Phone Number 276-2239  
Title of 12(b) Security Common Stock, $.001 par value  
Trading Symbol CELH  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   74,482,303