Subsequent Event	9 Months Ended
Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 24, 2018, Pieris Pharmaceuticals GmbH (the “Pieris GmbH”), a wholly-owned subsidiary of Pieris Pharmaceuticals, Inc. (the “Company”), entered into a lease agreement (the “Lease Agreement”) with Hallbergmoos Grundvermögen GmbH (the “Lessor”) pursuant to which Pieris GmbH has agreed to lease office and laboratory space located at Zeppelinstrasse 3, 85399 Hallbergmoos, Germany (the “Leased Property”). Under the Lease Agreement, 96,383 square feet of the Leased Property is expected to be delivered by the Lessor to Pieris GmbH by December 2019, 8,674 square feet of the Leased Property is expected to be delivered by the Lessor to Pieris GmbH by May 2020, and 22,284 square feet of the Leased Property is expected to be delivered by the Lessor to Pieris GmbH by October 2024. Pieris GmbH has a first right of refusal to lease an additional 13,440 square feet. Pieris GmbH intends to move its operations currently conducted at Lise-Meitner-Str. 30, 85354 Freising, Germany to the Leased Property. The Lease Agreement is contingent on the Lessor obtaining appropriate building permits from governmental authorities and either party may rescind the Lease Agreement if the Lessor does not obtain such permits within a specified period of time. The Lease Agreement provides for an initial term of 150 months, commencing on the date the Lessor first delivers the Leased Property to Pieris GmbH as agreed under the Lease Agreement. Pieris GmbH also has an option to extend the term of the Lease Agreement for two additional 60-month periods. Pieris GmbH may sublease space within the Leased Property with Lessor’s consent, which may not be unreasonably withheld. Monthly base rent for the initial 105,057 square feet of the Leased Property, including parking spaces, will total approximately$0.2M per month, which amount shall be adjusted starting on the second anniversary of the commencement date by an amount equal to the German consumer price index. In addition to the base rent, Pieris GmbH is also responsible for certain administrative and operational costs in accordance with the terms of the Lease Agreement. Pieris GmbH will maintain a security deposit in the amount of three months' rent. The Company will serve as a guarantor for the Lease Agreement. Pieris GmbH and the Lessor are each entitled to terminate the Lease Agreement for due cause. Specifically, the Lessor may terminate for Pieris GmbH’s default on rent payments beyond certain amounts, noncompliance with major obligations under the Lease Agreement, and certain bankruptcy and insolvency events.

Subsequent Event

On October 24, 2018, Pieris Pharmaceuticals GmbH (the “Pieris GmbH”), a wholly-owned subsidiary of Pieris Pharmaceuticals, Inc. (the “Company”), entered into a lease agreement (the “Lease Agreement”) with Hallbergmoos Grundvermögen GmbH (the “Lessor”) pursuant to which Pieris GmbH has agreed to lease office and laboratory space located at Zeppelinstrasse 3, 85399 Hallbergmoos, Germany (the “Leased Property”). Under the Lease Agreement, 96,383 square feet of the Leased Property is expected to be delivered by the Lessor to Pieris GmbH by December 2019, 8,674 square feet of the Leased Property is expected to be delivered by the Lessor to Pieris GmbH by May 2020, and 22,284 square feet of the Leased Property is expected to be delivered by the Lessor to Pieris GmbH by October 2024. Pieris GmbH has a first right of refusal to lease an additional 13,440 square feet. Pieris GmbH intends to move its operations currently conducted at Lise-Meitner-Str. 30, 85354 Freising, Germany to the Leased Property.

The Lease Agreement is contingent on the Lessor obtaining appropriate building permits from governmental authorities and either party may rescind the Lease Agreement if the Lessor does not obtain such permits within a specified period of time. The Lease Agreement provides for an initial term of 150 months, commencing on the date the Lessor first delivers the Leased Property to Pieris GmbH as agreed under the Lease Agreement. Pieris GmbH also has an option to extend the term of the Lease Agreement for two additional 60-month periods. Pieris GmbH may sublease space within the Leased Property with Lessor’s consent, which may not be unreasonably withheld.

Monthly base rent for the initial 105,057 square feet of the Leased Property, including parking spaces, will total approximately$0.2M per month, which amount shall be adjusted starting on the second anniversary of the commencement date by an amount equal to the German consumer price index. In addition to the base rent, Pieris GmbH is also responsible for certain administrative and operational costs in accordance with the terms of the Lease Agreement. Pieris GmbH will maintain a security deposit in the amount of three months' rent. The Company will serve as a guarantor for the Lease Agreement.

Pieris GmbH and the Lessor are each entitled to terminate the Lease Agreement for due cause. Specifically, the Lessor may terminate for Pieris GmbH’s default on rent payments beyond certain amounts, noncompliance with major obligations under the Lease Agreement, and certain bankruptcy and insolvency events.