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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Sales $ 9,916 $ 8,389
Cost of sales 4,926 4,163
Gross profit 4,990 4,226
Other costs and expenses:    
Research and development 562 709
Professional services 506 390
Salaries and related costs 2,116 2,460
Selling, general and administrative 2,670 2,404
Total other costs and expenses 5,854 5,963
Loss from operations (864) (1,737)
Interest expense, net (34) (31)
Change in fair value of derivative liabilities (26) 88
Total other (loss) income, net (60) 57
Loss before income taxes (924) (1,680)
Income tax expense 11 5
Net loss $ (935) $ (1,685)
Loss per share    
Basic (in dollars per share) $ (0.03) $ (0.05)
Diluted (in dollars per share) $ (0.03) $ (0.06)
Weighted average number of shares outstanding - basic (in shares) 32,878 30,860
Weighted average number of shares outstanding - dilutive (in shares) 32,878 30,887