Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.3.0.814
Stock-Based Compensation - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Stock Based Compensation [Line Items]          
Stock based compensation expense $ 337,790   $ 823,164   $ 0
Number of shares, Options exercised 0 0 0 0  
Weighted average grant date fair value     $ 1.94    
Unrecognized share-based compensation expense $ 3,800,000   $ 3,800,000    
Recognized weighted average service period     3 years 1 month 6 days    
Research and Development [Member]          
Stock Based Compensation [Line Items]          
Stock based compensation expense 88,176   $ 217,766    
General and Administrative [Member]          
Stock Based Compensation [Line Items]          
Stock based compensation expense 249,613   $ 605,398    
Pieris Plan [Member]          
Stock Based Compensation [Line Items]          
Number of shares, Options granted   0   0  
Pieris Plan [Member] | Employees Consultants And Directors [Member]          
Stock Based Compensation [Line Items]          
Number of shares, Options granted     663,262    
Pieris Plan [Member] | Newly Hired Executive [Member] | Research and Development [Member]          
Stock Based Compensation [Line Items]          
Stock based compensation expense $ 32,133   $ 32,133    
Number of shares, Options granted     500,000    
Pieris Plan [Member] | Newly Hired Executive [Member] | General and Administrative [Member]          
Stock Based Compensation [Line Items]          
Number of shares, Options granted     450,000