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Emflaza asset acquisition Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 20, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]          
Amortization of acquired intangible asset   $ 9,716 $ 0 $ 9,952 $ 0
Emflaza asset acquisition          
Business Acquisition [Line Items]          
Cash consideration $ 75,000        
Equity Interest Issued, number of shares (in shares) 6,683,598        
Fair value of PTC common stock issued to Marathon (6,683,598 shares) $ 75,190        
Acquisition costs 2,163        
Development and regulatory milestone payments which the entity may be obligated to pay $ 50,000        
Useful life 7 years        
Amortization of acquired intangible asset   4,300      
Accumulated amortization   $ 10,000   $ 10,000