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Emflaza asset acquisition Total purchase consideration (Details) - Emflaza asset acquisition $ in Thousands | Apr. 20, 2017 USD ($) shares
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Business Acquisition [Line Items] |
Cash consideration (upfront payment to Marathon) | $ 75,000
Equity Interest Issued, number of shares (in shares) | shares | 6,683,598
Fair value of PTC common stock issued to Marathon (6,683,598 shares) | $ 75,190
Acquisition costs | 2,163
Total preliminary consideration transferred | $ 152,353

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