v3.22.2.2
Cover - shares
 9 Months Ended
Sep. 30, 2022
Oct. 25, 2022
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Entity File Number 001-35969  
Entity Registrant Name PTC Therapeutics, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 04-3416587  
Entity Address, Address Line One 100 Corporate Court  
Entity Address, City or Town South Plainfield  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07080  
City Area Code 908  
Local Phone Number 222-7000  
Title of 12(b) Security Common Stock, $0.001 par value per share  
Trading Symbol PTCT  
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   71,882,044
Entity Central Index Key 0001070081  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Amendment Flag false