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Related Party Transactions (Details) - USD ($)				1 Months Ended	3 Months Ended		9 Months Ended
	Mar. 24, 2012	Sep. 28, 2011	Mar. 24, 2010	May. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Aug. 01, 2015	Jun. 30, 2015	Dec. 31, 2014
Related-Party Transactions (Textual) [Abstract]
Long-term other assets					$ 597,570		$ 597,570				$ 474,568
Subsidiary ownership percentage by parent				85.00%						91.00%
Receivable from sale of intangible assets				$ 1,000,000
Future payments to be received from sale of intangible assets				$ 1,000,000
Equity ownership percentage after transaction				20.00%
Maximum amount of additional equity fundraising				$ 10,000,000
Ownership of investment					16.90%		16.90%
Carrying value of investment				$ 0	$ 7,100,000		$ 7,100,000
Available-for-sale Securities
Related-Party Transactions (Textual) [Abstract]
Investment owned (shares)					395,758		395,758
Available-for-sale Securities | VGX International [Member]
Related-Party Transactions (Textual) [Abstract]
Investment owned (shares)									465,364
GeneOne Life Sciences [Member]
Related-Party Transactions (Textual) [Abstract]
Payment received for license granted			$ 3,000,000
Deferred revenue from affiliated entity			$ 3,000,000
Period over which deferred revenue from affiliated entity will be recognized in years			8 years
Revenue from related parties					$ 113,000	$ 113,000	$ 338,000	$ 367,000
Operating expenses related to affiliated entity					1,100,000	$ 400,000	6,500,000	$ 4,100,000
Accounts receivable balance					0		0				2,000
Accounts payable and accrued liability					2,800,000		2,800,000				28,000
Long-term other assets					$ 213,000		$ 213,000				$ 260,000
OncoSec [Member] | First warrant [Member]
Related-Party Transactions (Textual) [Abstract]
Common stock purchase warrant (in shares)		50,000
Term of the warrants in years		5 years
Exercise price of a five-year warrant ($ per share)		$ 24.00
OncoSec [Member] | Second warrant [Member]
Related-Party Transactions (Textual) [Abstract]
Common stock purchase warrant (in shares)	150,000
Term of the warrants in years	5 years
Exercise price of a five-year warrant ($ per share)	$ 20.00

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