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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sales $ 540,000 $ 621,000
Cost of goods sold 380,000 485,000
Gross profit 160,000 136,000
Operating expenses:    
Research and development 4,712,000 4,831,000
General and administrative 5,160,000 6,510,000
Total operating expenses 9,872,000 11,341,000
Loss from operations (9,712,000) (11,205,000)
Other income:    
Interest income 32,000 32,000
Net loss $ (9,680,000) $ (11,173,000)
Net loss per share - basic and fully diluted $ (0.63) $ (0.86)
Weighted average number of shares outstanding - basic and fully diluted 15,421,095 12,928,715