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Quarterly Results (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 530,000	$ 180,000	$ 0	$ 0	$ 360,000	$ 530,000	$ 540,000
Gross Profit (Loss)	(3,000)	(9,000)	(20,000)	135,000	66,000	(15,000)	0	109,000	103,000	160,000
Operating Expense	2,585,000	2,306,000	2,370,000	2,413,000	2,659,000	2,460,000	2,251,000	2,502,000	9,674,000	9,872,000
Net Loss	$ (2,541,000)	$ (2,292,000)	$ (2,389,000)	$ (2,278,000)	$ (2,593,000)	$ (2,472,000)	$ (2,236,000)	$ (2,379,000)	$ (9,500,000)	$ (9,680,000)
Net Loss per share - basic and fully diluted (in dollars per share)	$ (0.10)	$ (0.09)	$ (0.11)	$ (0.13)	$ (0.17)	$ (0.16)	$ (0.17)	$ (0.16)	$ 0.42	$ 0.63

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