Liquidity (Narrative) (Details) - USD ($)	69 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Liquidity [Abstract]
Retained earnings (accumulated deficit)	$ (371,860,000)	$ (362,522,000)
Retained earnings (accumulated deficit) during period	(56,400,000)
Cash and cash equivalents	$ 3,967,000	$ 9,370,000	$ 11,737,000	$ 6,581,000