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Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Sales: |  |
Product | $ 14,863 | $ 15,382
Service | 25,348 | 24,998
Net sales | 40,211 | 40,380
Costs and expenses: |  |
Costs of product sales | 10,539 | 10,670
Costs of service sales | 13,268 | 12,991
Research and development | 3,947 | 3,783
Sales, marketing and support | 8,740 | 8,658
General and administrative | 8,187 | 7,652
Total costs and expenses | 44,681 | 43,754
Loss from operations | (4,470) | (3,374)
Interest income | 166 | 105
Interest expense | 353 | 375
Other expense, net | (68) | (77)
Loss before income tax expense (benefit) | (4,725) | (3,721)
Income tax expense (benefit) | 160 | (930)
Net income (loss) | $ (4,885) | $ (2,791)
Net loss per common share |  |
Earnings Per Share, Basic and Diluted | $ (0.30) | $ (0.18)
Weighted average number of common shares outstanding: |  |
Weighted Average Number of Shares Outstanding, Basic | 16,261 | 15,723
Weighted Average Number of Shares Outstanding, Basic and Diluted |  | 15,723
Diluted | 16,261 | 15,723

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