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Stockholders' Equity - Summary of Total Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
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