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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock-based compensation $ 149,350 $ 242,417 $ 178,068
Cost of revenue      
Stock-based compensation 10,173 11,388 5,307
Selling and marketing      
Stock-based compensation 39,855 46,654 33,164
Technology and content      
Stock-based compensation 54,633 63,536 26,766
General and administrative      
Stock-based compensation 44,689 108,149 80,082
General and administrative      
Stock-based compensation $ 0 $ 12,690 $ 32,749