Collaborative Agreements (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
University Of Leicester [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Expenses Incurred Under Channel Collaborative Agreement	$ 97,000	$ 43,000
University Of Glasgow [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Expenses Incurred Under Channel Collaborative Agreement	0	0
Walter Reed Army Institute Of Research [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Expenses Incurred Under Channel Collaborative Agreement	$ 0	$ 0