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Geographic segments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of Operating Segments 1us-gaap_NumberOfOperatingSegments    
Total assets $ 333,219us-gaap_Assets $ 151,903us-gaap_Assets  
Property and equipment, net 9,159us-gaap_PropertyPlantAndEquipmentNet 6,730us-gaap_PropertyPlantAndEquipmentNet  
Revenue, Net 25,245us-gaap_SalesRevenueNet 34,696us-gaap_SalesRevenueNet 33,946us-gaap_SalesRevenueNet
Operating Segments      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets 333,219us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
151,903us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
 
Property and equipment, net 9,159us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
6,730us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
 
Revenue, Net 25,245us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
34,696us-gaap_SalesRevenueNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
 
US      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets 330,663us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= country_US
151,903us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= country_US
 
Property and equipment, net 8,555us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
6,730us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
 
Revenue, Net 25,245us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
34,696us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
 
Non US      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total assets 2,556us-gaap_Assets
/ us-gaap_StatementGeographicalAxis
= ptct_NonUsMember
   
Property and equipment, net $ 604us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= ptct_NonUsMember