General form of registration statement for all companies including face-amount certificate companies

Stock-Based Compensation - Additional Information (Detail)

v2.4.1.9
Stock-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Stock Based Compensation [Line Items]    
Shares issued under options plan 2,519,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross  
General and administrative expense recognized $ 571,382us-gaap_AllocatedShareBasedCompensationExpense  
Share-based payment award, award vesting period 3 years  
Maximum term of stock options 10 years  
Weighted average grant date fair value $ 3,248,413us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Options exercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Total fair value of shares vested 543,926us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1  
Options vested 423,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Unrecognized share-based compensation expense 2,588,411us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions  
Recognized weighted average service period 3 years  
General and Administrative [Member]    
Stock Based Compensation [Line Items]    
General and administrative expense recognized 563,759us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember 		 
Pieris Plan [Member]    
Stock Based Compensation [Line Items]    
Common stock reserved for issuance 3,200,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= pirs_PierisPlanMember 		 
Share-based compensation description (i) 1,000,000 shares, (ii) 4% of the number of shares of the Company’s common stock outstanding on such date, and (iii) such other amount determined by the administrator. As of December 31, 2014, options to purchase 1,430,000 shares of the Company’s common stock have been issued under the Pieris Plan to their executive officers and directors, and options to purchase 1,089,500 shares have been issued under the Pieris Plan to other employees and consultants.  
Common stock available for grant 680,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= pirs_PierisPlanMember 		 
Pieris Plan [Member] | Executive Officers And Directors [Member]    
Stock Based Compensation [Line Items]    
Shares issued under options plan 1,430,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= pirs_PierisPlanMember
/ us-gaap_TitleOfIndividualAxis
= pirs_ExecutiveOfficersAndDirectorsMember 		 
Pieris Plan [Member] | Employees and Consultants [Member]    
Stock Based Compensation [Line Items]    
Shares issued under options plan 1,089,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= pirs_PierisPlanMember
/ us-gaap_TitleOfIndividualAxis
= pirs_EmployeesAndConsultantsMember 		 
Pieris Plan [Member] | Consultant [Member] | General and Administrative [Member]    
Stock Based Compensation [Line Items]    
General and administrative expense recognized $ 131,984us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_PlanNameAxis
= pirs_PierisPlanMember
/ us-gaap_TitleOfIndividualAxis
= pirs_ConsultantMember