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Acquisitions - Schedule of purchase price (Details) - USD ($) $ in Thousands		12 Months Ended
	Apr. 20, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Cash consideration		$ 31,682	$ 8,433	$ 77,163
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)	75,190
Acquisition costs	2,163
Total consideration transferred	$ 152,353

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