Post-effective amendment to a registration statement that is not immediately effective upon filing

Stock-Based Compensation - Additional Information (Detail)

v3.3.1.900
Stock-Based Compensation - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Stock Based Compensation [Line Items]    
Maximum term of stock options 10 years  
Cash received from option exercises $ 10,000  
Options exercised 5,000 0
Number of shares, Options granted 305,329  
Stock based compensation expense $ 1,164,633 $ 571,382
Weighted-average price of options $ 2.47  
Weighted-average remaining contractual life 9 years 2 months 1 day 9 years 11 months 16 days
Research and Development [Member]    
Stock Based Compensation [Line Items]    
Stock based compensation expense $ 379,066 $ 7,623
Newly Hired Executive [Member]    
Stock Based Compensation [Line Items]    
Number of shares, Options granted 500,000  
Stock based compensation expense $ 0  
Weighted-average price of options $ 3.36  
Weighted-average remaining contractual life 9 years 7 months 17 days  
Newly Hired Executive [Member] | Research and Development [Member]    
Stock Based Compensation [Line Items]    
Stock based compensation expense $ 100,000  
Pieris Plan [Member]    
Stock Based Compensation [Line Items]    
Common stock reserved for issuance 3,200,000  
Share-based compensation description (i) 1,000,000 shares, (ii) 4% of the number of shares of the Company's common stock outstanding on such date, and (iii) such other amount determined by the Compensation committee of the Board of Directors.  
Common stock outstanding reserved for issuance, shares 1,000,000  
Common stock outstanding reserved for issuance, percent 4.00%  
Common stock available for grant 487,671  
Share-based payment award, vesting term Vesting periods are determined by our Board of Directors; options primarily vest over a three or four year period.  
Number of shares, Options granted 755,329 2,519,500
Pieris Plan [Member] | Newly Hired Executive [Member]    
Stock Based Compensation [Line Items]    
Number of shares, Options granted 450,000