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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 23, 2018 | Apr. 20, 2017 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jul. 23, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Contingent consideration payable |  |  |  |  | $ 344,900 |  | $ 310,240 |
Deferred consideration payable |  |  |  |  | $ 19,300 |  | $ 18,300 |
Issuance of common stock related to acquisition |  |  |  | $ 155,861 |  | $ 155,861 |  |
Useful life |  |  |  |  | 7 years |  |  |
Loans |  |  |  |  |  |  |  | $ 10,000
Non-collaborative Arrangement Transactions | Marathon Pharmaceuticals, LLC |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Cash consideration |  | $ 75,000 |  |  |  |  |  |
Equity Interest Issued, number of shares (in shares) |  | 6,683,598 |  |  |  |  |  |
Numerator for calculation of number of shares of equity interests issued to acquire entity |  | $ 65,000 |  |  |  |  |  |
Trading day period |  | 15 days |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  | $ 50,000 |  |  |  |  |  |
Agilis |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Cash consideration | $ 49,221 |  |  |  |  |  |  |
Equity Interest Issued, number of shares (in shares) | 3,500,907 |  |  |  |  |  |  |
Fair value of PTC common stock issued | $ 155,860 |  |  |  |  |  |  |
Estimated fair value of contingent consideration payable | 290,500 |  |  |  |  |  |  |
Deferred consideration payable | 38,100 |  |  |  |  |  |  |
Consideration Transferred | 533,681 |  |  |  |  |  |  |
Acquisition Related Costs |  |  |  |  |  | 1,500 |  |
Net loss attributable to common stockholders |  |  |  | (52,458) |  | (89,976) |  |
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 |  |  |  |  |  |  |
Earnings (loss) of acquire since acquisition date |  |  | $ (1,900) |  |  |  |  |
Development milestone payments which the entity is obligated to pay | $ 40,000 |  |  |  |  |  | $ 40,000 |
Agilis | Non-collaborative Arrangement Transactions |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Development milestone payments which the entity is obligated to pay |  |  |  |  | $ 40,000 |  |  |
Acquisition-related Costs | Agilis |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Net loss attributable to common stockholders |  |  |  | $ 800 |  | $ 1,500 |  |
Maximum | Agilis |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Priority review voucher amount |  |  |  |  | 535,000 |  | 535,000 |
Net sales amount |  |  |  |  | $ 150,000 |  | $ 150,000 |
Product sales |  |  |  |  | 6.00% |  | 6.00% |
Development milestone payments which the entity is obligated to pay |  |  |  |  | $ 60,000 |  | $ 60,000 |
Minimum | Agilis |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Product sales |  |  |  |  | 2.00% |  | 2.00% |

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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 acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + 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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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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