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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sales:        
Product $ 14,169 $ 19,020 $ 43,355 $ 54,464
Service 26,281 26,826 77,755 77,728
Net sales 40,450 45,846 121,110 132,192
Costs and expenses:        
Costs of product sales 9,578 11,001 29,412 34,660
Costs of service sales 13,374 13,576 39,736 39,826
Research and development 3,990 3,940 11,698 11,760
Sales, marketing and support 8,234 7,978 25,098 25,870
General and administrative 7,075 6,338 22,805 21,130
Total costs and expenses 42,251 42,833 128,749 133,246
(Loss) income from operations (1,801) 3,013 (7,639) (1,054)
Interest income 166 130 491 353
Interest expense 379 353 1,081 1,081
Other (expense) income, net (141) (56) (321) 11
(Loss) income before income tax expense (benefit) (2,155) 2,734 (8,550) (1,771)
Income tax expense (benefit) 283 (129) 799 (1,037)
Net income (loss) $ (2,438) $ 2,863 $ (9,349) $ (734)
Net (loss) income per common share        
Earnings Per Share, Basic and Diluted $ (0.15) $ 0.18 $ (0.57) $ (0.05)
Weighted average number of common shares outstanding:        
Weighted Average Number of Shares Outstanding, Basic 16,469 15,845 16,393 15,798
Diluted 16,469 15,915 16,393 15,798