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Condensed Consolidated Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Condensed Consolidated Statements of Operations        
Sales $ 0 $ 0 $ 0 $ 0
Cost of goods sold - warranty adjustment (see note 5) (153,000) 0 (153,000) 1,000
Gross profit (loss) 153,000 0 153,000 (1,000)
Operating expenses:        
Research and development, net of grants 418,000 864,000 1,228,000 1,766,000
General and administrative 1,171,000 1,583,000 2,324,000 3,057,000
Total operating expenses 1,589,000 2,447,000 3,552,000 4,823,000
Loss from operations (1,436,000) (2,447,000) (3,399,000) (4,824,000)
Other income:        
Other income 44,000 0 44,000 0
Interest income 1,000 21,000 1,000 69,000
Net loss (1,391,000) (2,426,000) (3,354,000) (4,755,000)
Net loss attributed to non-controlling interest 1,000 0 1,000 0
Net loss attributed to common stockholders $ (1,390,000) $ (2,426,000) $ (3,353,000) $ (4,755,000)
Net loss per share - basic and fully diluted $ (0.05) $ (0.09) $ (0.13) $ (0.18)
Weighted average number of shares outstanding - basic and fully diluted 26,712,294 26,699,788 26,709,791 26,698,546