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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 |

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