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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 |  |

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