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Cover Page - shares
6 Months Ended
Jun. 30, 2020
Jul. 27, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2020  
Document Transition Report false  
Entity File Number 001-33497  
Entity Registrant Name Amicus Therapeutics, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 71-0869350  
Entity Address, Address Line One 1 Cedar Brook Drive,  
Entity Address, City or Town Cranbury,  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 08512  
City Area Code (609)  
Local Phone Number 662-2000  
Title of 12(b) Security Common Stock  
Trading Symbol FOLD  
Security Exchange Name NASDAQ  
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 Common Stock, Shares Outstanding   258,787,743
Entity Central Index Key 0001178879  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Amendment Flag false