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The Company (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2013
The Company |  |
Accumulated deficit | $ 422,551 us-gaap_RetainedEarningsAccumulatedDeficit | $ 328,798 us-gaap_RetainedEarningsAccumulatedDeficit
Minimum age of ambulatory patient | 5 years |
Number of member states of the European Union | 31 ptct_NumberOfStates |

X
- Definition Represents the minimum age of ambulatory patient. + References No definition available. + Details
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Namespace Prefix: | ptct_
Data Type: | xbrli:durationItemType
Balance Type: | na
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X
- Definition Represents the number of states of european union + References No definition available. + Details
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Namespace Prefix: | ptct_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: | na
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
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