Pieris Pharmaceuticals, Inc. General form of registration statement for all companies including face-amount certificate companies

Property and Equipment, Net - Summary of Property and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 4,234,994us-gaap_PropertyPlantAndEquipmentGross	$ 4,540,852us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(2,182,773)	(2,103,175)
Property and equipment, net	2,052,221us-gaap_PropertyPlantAndEquipmentNet	2,437,677us-gaap_PropertyPlantAndEquipmentNet
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	50,791	57,779
Accumulated depreciation	(41,606)	(37,904)
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	3,840,368	4,093,704
Accumulated depreciation	(1,886,807)	(1,845,098)
Office and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment at cost	343,835	389,368
Accumulated depreciation	$ (254,360)	$ (220,172)