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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Condensed Consolidated Statements of Operations        
Sales $ 0 $ 0 $ 0 $ 530,000
Cost of goods sold 0 20,000 1,000 415,000
Gross profit (loss) 0 (20,000) (1,000) 115,000
Operating expenses:        
Research and development, net of grants 864,000 1,019,000 1,766,000 2,153,000
General and administrative 1,583,000 1,351,000 3,057,000 2,630,000
Total operating expenses 2,447,000 2,370,000 4,823,000 4,783,000
Loss from operations (2,447,000) (2,390,000) (4,824,000) (4,668,000)
Other income:        
Interest income 21,000 1,000 69,000 1,000
Net loss $ (2,426,000) $ (2,389,000) $ (4,755,000) $ (4,667,000)
Net loss per share - basic and fully diluted $ (0.09) $ (0.11) $ (0.18) $ (0.24)
Weighted average number of shares outstanding - basic and fully diluted 26,699,788 21,362,596 26,698,546 19,549,975