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

Stock-based Compensation - Schedule of Total Stock-Based Compensation Expense Related to Share-Based Awards under the Pieris Plan (Detail)

v2.4.1.9
Stock-based Compensation - Schedule of Total Stock-Based Compensation Expense Related to Share-Based Awards under the Pieris Plan (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-option expense $ 217,335us-gaap_AllocatedShareBasedCompensationExpense $ 571,382us-gaap_AllocatedShareBasedCompensationExpense
Research and Development [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-option expense 51,038us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
7,623us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
General and Administrative [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total stock-option expense $ 166,297us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 563,759us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember