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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

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