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Business Combination - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 23, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 23, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  | $ 4,500 |  | $ 4,500 |  |  |
Contingent consideration payable |  | 218,700 |  | 218,700 |  |  | $ 0
Estimated fair value of deferred consideration payable |  | 38,200 |  | 38,200 |  |  | $ 0
Agilis |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration | $ 49,221 |  |  |  |  |  |
Equity Interest Issued, number of shares (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 payments which the entity is obligated to pay | 40,000 | 40,000 |  | 40,000 |  |  |
Contingent consideration payable | 218,700 | 218,700 |  | 218,700 |  |  |
Estimated fair value of deferred consideration payable | 38,200 |  |  |  |  |  |
Total preliminary consideration transferred | $ 461,981 |  |  |  |  |  |
Acquisition related costs |  | 1,500 |  |  |  |  |
Earnings (loss) of acquiree since acquisition date, actual |  | 1,900 |  |  |  |  |
Due from related parties |  |  |  |  |  | $ 10,000 |
Net loss attributable to common stockholders |  | (52,458) | $ (41,606) | (89,976) | $ (90,795) |  |
Maximum | Agilis |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  | 60,000 |  | 60,000 |  |  |
Milestone, potential achievements, priority review voucher amount |  |  |  | 535,000 |  |  |
Milestone, potential achievements, net sales amount |  | $ 150,000 |  | $ 150,000 |  |  |
Milestone, potential achievements, product sales |  | 6.00% |  | 6.00% |  |  |
Minimum | Agilis |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Milestone, potential achievements, product sales |  | 2.00% |  | 2.00% |  |  |
Acquisition-related Costs | Agilis |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net loss attributable to common stockholders |  | $ 800 |  | $ 1,500 |  |  |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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