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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement [Abstract]    
Sales $ 8,389 $ 7,775
Cost of sales 4,163 4,452
Gross profit 4,226 3,323
Other costs and expenses:    
Research and development 709 668
Professional services 390 357
Salaries and related costs 2,460 2,100
Selling, general and administrative 2,404 2,191
Total other costs and expenses 5,963 5,316
Loss from operations (1,737) (1,993)
Interest expense, net (31) (38)
Change in fair value of derivative liabilities, net 88 87
Total other income, net 57 49
Loss before income taxes (1,680) (1,944)
Income tax expense 5 0
Net loss $ (1,685) $ (1,944)
Loss per share    
Basic (in dollars per share) $ (0.05) $ (0.07)
Diluted (in dollars per share) $ (0.06) $ (0.07)
Weighted average number of shares outstanding - basic (in shares) 30,860 27,051
Weighted average number of shares outstanding - dilutive (in shares) 30,887 27,051