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Acquisitions - Agilis Acquisition (Details) - USD ($) $ in Thousands		4 Months Ended	12 Months Ended
	Aug. 23, 2018	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2018	Apr. 29, 2020
Acquisitions
Estimated fair value of deferred consideration payable			$ 0
Agilis
Acquisitions
Cash consideration	$ 49,221
Issuance of common stock related to acquisition (in shares)	3,500,907
Numerator for calculation of number of shares of equity interests issued to acquire entity	$ 150,000
Trading day period	10 days
Fair value of PTC common stock issued	$ 155,860
Development milestone payment obligations			$ 40,000
Net sales amount					$ 150,000
Estimated fair value of contingent consideration payable	290,500
Estimated fair value of deferred consideration payable	$ 38,100
Loss of acquire since acquisition date		$ 8,700
Agilis | Selling, general and administrative
Acquisitions
Acquisition related expenses				$ 1,700
Agilis | Minimum
Acquisitions
Product sales (as a percent)			2.00%		2.00%
Agilis | Maximum
Acquisitions
Development milestone payment obligations			$ 60,000
Priority review voucher amount			535,000
Net sales amount			$ 150,000		$ 150,000
Product sales (as a percent)			6.00%		6.00%

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