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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Revenue $ 1,619,971 $ 1,394,205 $ 985,737
Cost of revenue 946,757 766,970 623,953
Gross profit 673,214 627,235 361,784
Operating expenses:      
Research and development 241,694 151,852 73,737
Sales and marketing 268,939 194,377 157,771
General and administrative 107,833 93,971 31,573
Total operating expenses 618,466 440,200 263,081
Operating income 54,748 187,035 98,703
Other expense, net (2,163) (6,060) (7,374)
Income before income taxes 52,585 180,975 91,329
Income tax expense 16,454 52,887 30,751
Net income 36,131 128,088 60,578
Less: net income allocable to participating securities 0 (16,512) (16,727)
Net income attributable to common stockholders—basic 36,131 111,576 43,851
Add: net income allocable to dilutive participating securities 0 2,277 2,309
Net income attributable to common stockholders—diluted $ 36,131 $ 113,853 $ 46,160
Net income per share attributable to common stockholders - Basic (in dollars per share) $ 0.27 $ 1.07 $ 0.54
Net income per share attributable to common stockholders - Diluted (in dollars per share) $ 0.25 $ 0.92 $ 0.47
Weighted-average shares used to compute net income per share attributable to common stockholders - Basic (in shares) 134,595 104,453 81,018
Weighted-average shares used to compute net income per share attributable to common stockholders - Diluted (in shares) 146,486 123,630 98,941