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NeuVaxTM Acquisition (Additional Information) (Detail) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Apr. 13, 2011
Jun. 30, 2013
Sep. 30, 2012
Jan. 19, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 10, 2012
Jan. 18, 2012
Business Combinations [Abstract]                  
Date of acquisition of Apthera, Inc. Apr. 13, 2011                
Approximate shares of common stock issued to Apthera's stockholders 5,000,000                
Future contingent payments $ 32,000,000       $ 30,000,000        
Estimated value of the earn-out consideration 6,460,000           6,460,000    
Contingent liability       1,000,000          
Restricted shares of common stock issued       1,315,849          
Increase in number of milestone shares on obtaining shareholder approval                 $ 0.76
Payment to the former Apthera shareholders in cash     35,000            
Payment to the former Apthera shareholders in cash at an interest factor               10.00%  
Additional other expense related to fair value of the shares on the date of issuance           579,000      
MIlestone Payment   1,247,000     2,000,000        
Shares Issued for Milestone Payment   492,988              
Increase in the fair value of the contingent liability         926,000 2,370,000      
Decrease in the fair value of the contingent liability             109,000    
Fair value of the contingent liability         6,821,000 7,142,000      
Current contingent liability         $ 0 $ 935,000