Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Derivative Liabilities	Jun. 30, 2011 Derivative Liabilities	Jun. 30, 2012 PharmAthene	Jun. 30, 2011 PharmAthene	Dec. 30, 2011 PharmAthene	Dec. 31, 2010 PharmAthene
Fair Value Measurements [Line Items]
Warrant to purchase common stock					2,899,991	2,899,991
Change in market value of derivative instruments	$ 823,809	$ 688,221	$ (167,853)	$ 3,176,686
Closing stock price, per share							$ 1.39	$ 2.94	$ 1.27	$ 4.23