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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Sales:    
Product $ 13,992 $ 14,863
Service 26,109 25,348
Net sales 40,101 40,211
Costs and expenses:    
Costs of product sales 8,923 10,539
Costs of service sales 13,816 13,268
Research and development 3,934 3,947
Sales, marketing and support 8,941 8,740
General and administrative 7,667 8,187
Total costs and expenses 43,281 44,681
Loss from operations (3,180) (4,470)
Interest income 148 166
Interest expense 409 353
Other expense, net (274) (68)
Loss before income tax expense (3,715) (4,725)
Income tax expense 178 160
Net loss $ (3,893) $ (4,885)
Net loss per common share    
Earnings Per Share, Basic and Diluted $ (0.23) $ (0.30)
Weighted average number of common shares outstanding:    
Weighted Average Number of Shares Outstanding, Basic 16,742 16,261
Weighted Average Number of Shares Outstanding, Basic and Diluted   16,261
Diluted 16,742 16,261