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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sales:        
Product $ 14,323 $ 20,062 $ 29,186 $ 35,444
Service 26,126 25,904 51,474 50,902
Net sales 40,449 45,966 80,660 86,346
Costs and expenses:        
Costs of product sales 9,295 12,989 19,834 23,659
Costs of service sales 13,094 13,259 26,362 26,250
Research and development 3,761 4,037 7,708 7,820
Sales, marketing and support 8,124 9,234 16,864 17,892
General and administrative 7,543 7,140 15,730 14,792
Total costs and expenses 41,817 46,659 86,498 90,413
Loss from operations (1,368) (693) (5,838) (4,067)
Interest income 159 118 325 223
Interest expense 349 353 702 728
Other (expense) income, net (112) 144 (180) 67
Loss before income tax expense (benefit) (1,670) (784) (6,395) (4,505)
Income tax expense (benefit) 356 22 516 (908)
Net income (loss) $ (2,026) $ (806) $ (6,911) $ (3,597)
Net loss per common share        
Earnings Per Share, Basic and Diluted $ (0.12) $ (0.05) $ (0.42) $ (0.23)
Weighted average number of common shares outstanding:        
Weighted Average Number of Shares Outstanding, Basic 16,446 15,825 16,354 15,774
Weighted Average Number of Shares Outstanding, Basic and Diluted   15,825 16,354 15,774
Diluted 16,446 15,825 16,354 15,774