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Acquisitions - Schedule of Business Acquisitions (Details) - USD ($)
$ in Thousands
Aug. 23, 2018
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Deferred consideration payable   $ 19,300 $ 18,300
Agilis      
Business Acquisition [Line Items]      
Cash consideration $ 49,221    
Fair value of PTC common stock issued 155,860    
Deferred consideration payable 38,100    
Estimated fair value of contingent consideration payable 290,500    
Consideration Transferred $ 533,681