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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Sales:        
Product $ 25,886 $ 21,041 $ 51,102 $ 38,124
Service 17,311 10,978 32,022 20,623
Net sales 43,197 32,019 83,124 58,747
Costs and expenses:        
Costs of product sales 14,310 12,746 28,219 23,729
Costs of service sales 10,860 6,822 21,110 12,624
Research and development 3,250 3,059 6,200 6,199
Sales, marketing and support 7,541 5,547 14,484 10,879
General and administrative 4,936 2,918 8,310 5,866
Total costs and expenses 40,897 31,092 78,323 59,297
Income (loss) from operations 2,300 927 4,801 (550)
Interest income 204 109 373 212
Interest expense 186 85 261 167
Other income, net 54 39 78 76
Income (loss) before income tax expense (benefit) 2,372 990 4,991 (429)
Income tax expense (benefit) 824 537 1,479 493
Net income (loss) $ 1,548 $ 453 $ 3,512 $ (922)
Net Income (Loss) per Common Share [Abstract]        
Basic and diluted $ 0.10 $ 0.03 $ 0.23 $ (0.06)
Number of shares used in per share calculation:        
Basic 15,136,568 14,776,239 15,063,315 14,690,591
Diluted 15,234,898 14,886,548 15,253,288 14,690,591