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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:      
Total revenue $ 577,905 $ 329,942 $ 252,591
Cost of revenue:      
Total cost of revenue 269,573 128,446 84,980
Gross profit 308,332 201,496 167,611
Operating expenses:      
Research and development 145,462 101,481 72,841
Sales and marketing 128,276 83,403 68,539
General and administrative 66,036 47,642 35,948
Acquisition- and integration-related 16,951 14,763 1,152
Restructuring 17,015 9,436 2,740
Total operating expenses 373,740 256,725 181,220
Loss from operations (65,408) (55,229) (13,609)
Interest (expense) income, net (4,230) 263 769
Other (expense) income, net (3,772) 1,274 1,424
Loss before income taxes (73,410) (53,692) (11,416)
Income tax (provision) benefit (3,400) 18,440 (2,516)
Net loss $ (76,810) $ (35,252) $ (13,932)
Loss per share:      
Basic (in dollars per share) $ (0.74) $ (0.60) $ (0.28)
Diluted (in dollars per share) $ (0.74) $ (0.60) $ (0.28)
Shares used to compute loss per share:      
Basic (in shares) 103,916 58,822 49,385
Diluted (in shares) 103,916 58,822 49,385
Product      
Revenue:      
Total revenue $ 279,014 $ 181,119 $ 146,381
Cost of revenue:      
Total cost of revenue 142,185 70,250 47,367
Service      
Revenue:      
Total revenue 298,891 148,823 106,210
Cost of revenue:      
Total cost of revenue $ 127,388 $ 58,196 $ 37,613