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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues:        
Total revenues $ 188,673 $ 181,042 $ 371,292 $ 329,595
Cost of revenues:        
Total cost of revenues 99,890 102,910 200,054 189,272
Gross profit 88,783 78,132 171,238 140,323
Operating expenses:        
Research and development 15,512 16,911 32,049 33,714
Selling, general, and administrative 65,937 61,922 131,222 123,862
Total operating expenses 81,449 78,833 163,271 157,576
Income (loss) from operations 7,334 (701) 7,967 (17,253)
Interest and other income (expense), net (896) 196 (3,625) (2,260)
Income (loss) before provision for income taxes 6,438 (505) 4,342 (19,513)
Provision for (benefit from) income taxes (150) (2,385) (4,966) (11,058)
Net income (loss) $ 6,588 $ 1,880 $ 9,308 $ (8,455)
Net income (loss) per share:        
Net income (loss) per share - basic (in dollars per share) $ 0.17 $ 0.05 $ 0.24 $ (0.23)
Net income (loss) per share - diluted (in dollars per share) $ 0.16 $ 0.05 $ 0.23 $ (0.23)
Weighted-average shares outstanding:        
Weighted-average shares outstanding — basic (in shares) 38,970 37,250 38,804 37,046
Weighted-average shares outstanding — diluted (in shares) 40,000 38,370 39,854 37,046
Product revenues        
Revenues:        
Total revenues $ 134,636 $ 130,205 $ 265,295 $ 228,996
Cost of revenues:        
Total cost of revenues 75,076 81,738 150,493 145,326
Services and other revenues        
Revenues:        
Total revenues 54,037 50,837 105,997 100,599
Cost of revenues:        
Total cost of revenues $ 24,814 $ 21,172 $ 49,561 $ 43,946