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Acquisitions - Schedule of purchase price (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 20, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Cash consideration |  | $ 8,433 | $ 77,163 | $ 0
Fair value of PTC common stock issued to Marathon (6,683,598 shares) |  | $ 155,860 | $ 75,191 |
Intellectual Property | Marathon Pharmaceuticals, LLC |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Cash consideration | $ 75,000 |  |  |
Fair value of PTC common stock issued to Marathon (6,683,598 shares) | 75,200 |  |  |
Acquisition costs | 2,200 |  |  |
Total preliminary consideration transferred | $ 152,353 |  |  |

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