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The Company (USD $)
In Thousands, unless otherwise specified
0 Months Ended
Aug. 04, 2014
state
Mar. 31, 2015
Dec. 31, 2014
The Company      
Minimum age of ambulatory patient 5 years    
Number of member states of the European Union 31ptct_NumberOfStates    
Accumulated deficit   $ (460,466)us-gaap_RetainedEarningsAccumulatedDeficit $ (422,551)us-gaap_RetainedEarningsAccumulatedDeficit