Liquidity (Narrative) (Details) - USD ($)	12 Months Ended	60 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Liquidity [Abstract]
Retained earnings (accumulated deficit)	$ (362,522,000)	$ (362,522,000)	$ (362,006,000)
Retained earnings (accumulated deficit) during period		(47,000,000)
Cash and cash equivalents	$ 9,370,000	$ 9,370,000	$ 6,581,000	$ 20,355,000
Liquidity disclosure	Management believes that our existing resources will be sufficient to fund our planned operations through the third quarter of 2016.