Liquidity (Narrative) (Details) - USD ($)	3 Months Ended								12 Months Ended
Liquidity (Narrative) (Details) - USD ($)	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 15, 2015
Liquidity [Line Items]
Lymphoseek sales revenue	$ 3,503,000	$ 2,953,000	$ 1,964,000	$ 1,835,000	$ 1,460,000	$ 1,101,000	$ 1,046,000	$ 627,000	$ 10,254,352	$ 4,233,953	$ 614,423
Capital Royalty Partners II LP [Member]
Liquidity [Line Items]
Liquidity minimum	$ 5,000,000								5,000,000			$ 5,000,000
Minimum sales revenue target in 2016									22,500,000
Minimum sales revenue target in 2015									11,000,000
Reduced minimum sales revenue target in 2015									$ 10,000,000
Debt instrument default interest rate percentage	18.00%								18.00%
Cure right ratio									2.50%