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Quarterly Results (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Quarterly Results                    
Revenue $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 530,000 $ 0 $ 530,000
Gross Profit (Loss) 0 0 0 (1,000) (3,000) (9,000) (20,000) 135,000 (1,000) 103,000
Operating Expense 1,621,000 2,138,000 2,447,000 2,376,000 2,585,000 2,306,000 2,370,000 2,413,000 8,582,000 9,674,000
Net loss attributed to common stockholders $ (1,616,000) $ (2,108,000) $ (2,426,000) $ (2,329,000) $ (2,541,000) $ (2,292,000) $ (2,389,000) $ (2,278,000) $ (8,479,000) $ (9,500,000)
Net Loss per share - basic and fully diluted (in dollars per share) $ (0.06) $ (0.08) $ (0.09) $ (0.09) $ (0.10) $ (0.09) $ (0.11) $ (0.13) $ 0.32 $ 0.42