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Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Sales:        
Product $ 20,998 $ 25,886 $ 39,005 $ 51,102
Service 19,924 17,311 38,902 32,022
Net sales 40,922 43,197 77,907 83,124
Costs and expenses:        
Costs of product sales 12,078 14,310 23,410 28,219
Costs of service sales 11,359 10,860 22,419 21,110
Research and development 3,882 3,250 7,549 6,200
Sales, marketing and support 7,677 7,541 15,147 14,484
General and administrative 5,252 4,936 10,402 8,310
Total costs and expenses 40,248 40,897 78,927 78,323
Income (loss) from operations 674 2,300 (1,020) 4,801
Interest income 205 204 415 373
Interest expense 186 186 377 261
Other (expense) income, net (21) 54 86 78
Income (loss) before income tax expense 672 2,372 (896) 4,991
Income tax expense 617 824 172 1,479
Net income (loss) $ 55 $ 1,548 $ (1,068) $ 3,512
Net income (loss) per common share        
Basic and diluted $ 0.00 $ 0.10 $ (0.07) $ 0.23
Weighted average number of common shares outstanding:        
Basic 15,415 15,137 15,365 15,063
Diluted 15,522 15,235 15,365 15,253