Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Detail)

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Stock-based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stock Based Compensation [Line Items]            
Number of shares, Options outstanding 2,616,735 2,544,500 2,519,500   2,616,735  
Number of shares, Options granted 72,235 25,000        
Share-based payment award, award vesting period         3 years  
Maximum term of stock options         10 years  
Weighted average grant date fair value $ 130,456       $ 176,898  
Number of shares, Options exercised 0 0   0 0 0
Options vested 200,673       375,319  
Unrecognized share-based compensation expense $ 2,253,478       $ 2,253,478  
Recognized weighted average service period         2 years 6 months  
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. As of June 30, 2015, options to purchase 1,470,235 shares of the Company's common stock are outstanding under the Pieris Plan to its executive officers and directors. 40,235 of these shares were granted during the second quarter of 2015. All other shares were granted in the fourth quarter of 2014.  
Common stock available for grant 583,265       583,265  
Pieris Plan [Member] | Executive Officers And Directors [Member]            
Stock Based Compensation [Line Items]            
Number of shares, Options outstanding 1,470,235       1,470,235  
Number of shares, Options granted 40,235          
Pieris Plan [Member] | Other Employees and Consultants [Member]            
Stock Based Compensation [Line Items]            
Number of shares, Options outstanding 1,146,500       1,146,500  
Number of shares, Options granted 32,000 25,000 1,089,500