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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
Product $ 130,104 $ 98,702
Services and other revenues 52,515 49,851
Total revenues 182,619 148,553
Cost of revenues:    
Cost of product revenues 75,417 63,588
Cost of services and other revenues 24,747 22,774
Total cost of revenues 100,164 86,362
Gross profit 82,455 62,191
Operating expenses:    
Research and development 16,537 16,803
Selling, general and administrative 65,285 61,940
Total operating expenses 81,822 78,743
Income (loss) from operations 633 (16,552)
Interest and other income (expense), net (2,729) (2,456)
Loss before provision for income taxes (2,096) (19,008)
Benefit from income taxes (4,816) (8,673)
Net income (loss) $ 2,720 $ (10,335)
Net income (loss) per share:    
Net income (loss) per share - basic (in dollars per share) $ 0.07 $ (0.28)
Net income (loss) per share - diluted (in dollars per share) $ 0.07 $ (0.28)
Weighted-average shares outstanding:    
Weighted-average shares outstanding — basic (in shares) 38,635 36,840
Weighted-average shares outstanding — diluted (in shares) 39,691 36,840