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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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