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Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Sales:    
Product $ 25,216 $ 17,083
Service 14,711 9,645
Net sales 39,927 26,728
Costs and expenses:    
Costs of product sales 13,909 10,983
Costs of service sales 10,249 5,802
Research and development 2,950 3,141
Sales, marketing and support 6,943 5,332
General and administrative 3,374 2,947
Total costs and expenses 37,425 28,205
Income (loss) from operations 2,502 (1,477)
Interest income 168 103
Interest expense 76 82
Other income, net 24 37
Income (loss) before income tax expense (benefit) 2,618 (1,419)
Income tax expense (benefit) 655 (44)
Net income (loss) $ 1,963 $ (1,375)
Net Income (Loss) per Common Share [Abstract]    
Basic and diluted $ 0.13 $ (0.09)
Number of shares used in per share calculation:    
Basic 14,989,248 14,604,942
Diluted 15,219,043 14,604,942