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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Sales:        
Product $ 16,162 $ 14,323 $ 30,154 $ 29,186
Service 27,230 26,126 53,339 51,474
Net sales 43,392 40,449 83,493 80,660
Costs and expenses:        
Costs of product sales 10,094 9,295 19,017 19,834
Costs of service sales 15,498 13,094 29,314 26,362
Research and development 3,565 3,761 7,499 7,708
Sales, marketing and support 8,494 8,124 17,435 16,864
General and administrative 6,928 7,543 14,595 15,730
Total costs and expenses 44,579 41,817 87,860 86,498
Loss from operations (1,187) (1,368) (4,367) (5,838)
Interest income 155 159 303 325
Interest expense 428 349 837 702
Other income (expense), net 446 (112) 172 (180)
Loss before income tax expense (1,014) (1,670) (4,729) (6,395)
Income tax expense 329 356 507 516
Net loss $ (1,343) $ (2,026) $ (5,236) $ (6,911)
Net loss per common share        
Earnings Per Share, Basic and Diluted $ (0.08) $ (0.12) $ (0.31) $ (0.42)
Weighted average number of common shares outstanding:        
Weighted Average Number of Shares Outstanding, Basic 17,140 16,446 16,942 16,354
Weighted Average Number of Shares Outstanding, Basic and Diluted   16,446 16,942 16,354
Diluted 17,140 16,446 16,942 16,354