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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Sales:    
Product $ 15,382 $ 15,386
Service 24,998 25,919
Net sales 40,380 41,305
Costs and expenses:    
Costs of product sales 10,670 10,485
Costs of service sales 12,991 13,260
Research and development 3,783 3,750
Sales, marketing and support 8,658 8,080
General and administrative 7,652 7,638
Total costs and expenses 43,754 43,213
Loss from operations (3,374) (1,908)
Interest income 105 148
Interest expense 375 368
Other (expense) income, net (77) 413
Loss before income tax benefit (3,721) (1,715)
Income tax benefit (930) (293)
Net income (loss) $ (2,791) $ (1,422)
Net loss per common share    
Earnings Per Share, Basic and Diluted $ (0.18) $ (0.09)
Weighted average number of common shares outstanding:    
Weighted Average Number of Shares Outstanding, Basic 15,723 15,538
Weighted Average Number of Shares Outstanding, Basic and Diluted   15,538
Diluted 15,723 15,538