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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sales $ 0 $ 0 $ 530,000 $ 360,000
Cost of goods sold 20,000 0 415,000 251,000
Gross profit (loss) (20,000) 0 115,000 109,000
Operating expenses:        
Research and development 1,019,000 1,141,000 2,153,000 2,315,000
General and administrative 1,351,000 1,110,000 2,630,000 2,438,000
Total operating expenses 2,370,000 2,251,000 4,783,000 4,753,000
Loss from operations (2,390,000) (2,251,000) (4,668,000) (4,644,000)
Other income:        
Interest income 1,000 15,000 1,000 29,000
Net loss $ (2,389,000) $ (2,236,000) $ (4,667,000) $ (4,615,000)
Net loss per share - basic and fully diluted $ (0.11) $ (0.14) $ (0.24) $ (0.30)
Weighted average number of shares outstanding - basic and fully diluted 21,362,596 15,601,380 19,549,575 15,234,010