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

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.1.9
Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Segment
Dec. 31, 2014
Segment
Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]      
Restricted cash   $ 0us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue $ 72,497us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Trade accounts receivable   0us-gaap_AccountsReceivableNetCurrent 481,810us-gaap_AccountsReceivableNetCurrent
Allowance for doubtful accounts   0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Impairments loss   0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Milestones arrangement, categories description Pieris Pharmaceuticals, Inc. aggregates milestones into three categories (i) research milestones, (ii) development milestones and (iii) commercial milestones. The Company aggregates milestones into three categories (i) research milestones, (ii) development milestones and (iii) commercial milestones.  
Number of Operating segment 1us-gaap_NumberOfOperatingSegments 1us-gaap_NumberOfOperatingSegments  
Stock equivalents granted     0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Effective tax rate 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations    
Fair Value, Inputs, Level 1 [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Cash and Cash Equivalents, Fair Value $ 471,011us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
$ 4,800,573us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
$ 3,307,520us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member