Liquidity (Narrative) (Details) - USD ($)	66 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Liquidity [Abstract]
Retained earnings (accumulated deficit)	$ (369,485,000)	$ (362,522,000)
Retained earnings (accumulated deficit) during period	(54,000,000)
Cash and cash equivalents	$ 7,144,000	$ 9,370,000	$ 14,351,000	$ 6,581,000