Annual report pursuant to Section 13 and 15(d)

Acquisition - Additional Information (Detail)

v2.4.1.9
Acquisition - Additional Information (Detail) (USD $)
 0 Months Ended 12 Months Ended
Dec. 17, 2014
Dec. 05, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 16, 2014
Business Acquisition [Line Items]          
Stock split ratio   2.272727us-gaap_StockholdersEquityNoteStockSplitConversionRatio1      
Common stock, shares outstanding   13,863,647us-gaap_CommonStockSharesOutstanding 11,828,974us-gaap_CommonStockSharesOutstanding 29,279,522us-gaap_CommonStockSharesOutstanding  
Common stock, shares authorized     300,000,000us-gaap_CommonStockSharesAuthorized 300,000,000us-gaap_CommonStockSharesAuthorized  
Common stock, par value     0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare  
Preferred stock, shares authorized     10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, par value     0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Pre-acquisition shares transferred and canceled 11,363,635us-gaap_StockRedeemedOrCalledDuringPeriodShares        
Scenario, Previously Reported          
Business Acquisition [Line Items]          
Common stock, shares outstanding   6,100,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioPreviouslyReportedMember 		     
Pieris AG [Member]          
Business Acquisition [Line Items]          
Aggregate shares issued upon acquisition 20,000,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= pirs_PierisAgMember 		  11,828,974us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= pirs_PierisAgMember 		   
Percentage of former stockholders ownership 89.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= pirs_PierisAgMember 		       
Common stock, shares outstanding 20,000,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_BusinessAcquisitionAxis
= pirs_PierisAgMember 		       
Minimum [Member]          
Business Acquisition [Line Items]          
Common stock, shares authorized         75,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Common stock, par value         $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]          
Business Acquisition [Line Items]          
Common stock, shares authorized         300,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Common stock, par value         $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_RangeAxis
= us-gaap_MaximumMember