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Emflaza asset acquisition Narrative (Details) - Emflaza asset acquisition - USD ($)
$ in Thousands
Apr. 20, 2017
Jun. 30, 2017
Business Acquisition [Line Items]    
Cash consideration (upfront payment to Marathon) $ 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  
Accumulated amortization   $ 200