Deferred Revenue	12 Months Ended
Deferred Revenue	Dec. 31, 2012
Deferred Revenue Disclosure [Abstract]
Deferred Revenue	Deferred Revenue The Company defers revenue recognition of cash receipts from licensing and other agreements and recognizes them ratably over the minimum remaining period of our performance obligations. The combined current and long-term deferred revenue balance of $2.4 million and $2.5 million as of December 31, 2012 and 2011, respectively, consists primarily of cash received from our collaboration and license agreement with VGX Int’l as well as cash receipts from various licensing and other agreements.

The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References+ Details