Business Acquisition, Equity Interest Issued Or Issuable, Trading Day Period

No definition available.

Name:	ptct_BusinessAcquisitionEquityInterestIssuedOrIssuableTradingDayPeriod
Namespace Prefix:	ptct_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Business Acquisition, Numerator For Calculation Of Number Of Shares Of Equity Interests Issued To Acquire Entity

+ References

No definition available.

+ Details

Name:	ptct_BusinessAcquisitionNumeratorForCalculationOfNumberOfSharesOfEquityInterestsIssuedToAcquireEntity
Namespace Prefix:	ptct_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the development and regulatory milestones payments which the entity may be obligated to pay under certain contractual agreements.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents number of countries.

+ References

No definition available.

+ Details

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Namespace Prefix:	ptct_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Products

+ References

No definition available.

+ Details

Name:	ptct_NumberOfProducts
Namespace Prefix:	ptct_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of states in European economic area.

+ References

No definition available.

+ Details

Name:	ptct_NumberOfStatesInEuropeanEconomicArea
Namespace Prefix:	ptct_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 45
-Paragraph 13
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-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=us-gaap_NoncollaborativeArrangementTransactionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=ptct_MarathonPharmaceuticalsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=ptct_TranslarnaMember
Namespace Prefix:
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Balance Type:
Period Type:

The Company (Details) $ in Thousands		1 Months Ended	6 Months Ended
The Company (Details) $ in Thousands	Apr. 20, 2017 USD ($) shares	Aug. 31, 2014 member_state	Jun. 30, 2018 USD ($) product number_country	Dec. 31, 2017 USD ($)	Aug. 31, 2015
Long-term debt
Number of products \| product			2
Number of member states of the European Economic Area \| member_state		31
Retained earnings (accumulated deficit)			$ (839,624)	$ (814,108)
Convertible debt \| 3.00% Convertible senior notes due 2022
Long-term debt
Interest rate					3.00%
Non-collaborative Arrangement Transactions \| Marathon Pharmaceuticals, LLC
Long-term debt
Cash consideration	$ 75,000
Equity Interest Issued, number of shares (in shares) \| 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 and regulatory milestone payments which the entity may be obligated to pay	$ 50,000
Translarna
Long-term debt
Number of countries \| number_country			25