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Stockholders' Equity - Summary of Total Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | $ 162,556 | $ 133,258
Cost of Revenue |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | 1,849 | 276
Research and Development |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | 112,242 | 77,815
Sales and Marketing |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | 17,760 | 16,185
General and Administrative |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total | $ 30,705 | $ 38,982

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