Employee Benefit Plans - Summary of Stock-based Compensation Expense Recognized in Financial Statements (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 25, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized	$ 89,900	$ 14,782	$ 98,812	$ 45,047	$ 116,104
Capitalized stock-based compensation expense		858	495	2,889	1,251
Stock-based compensation expense		15,640	99,307	47,936	117,355
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		718	6,472	2,805	7,776
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		5,468	37,490	15,863	43,903
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		2,918	14,496	8,714	16,411
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		$ 5,678	$ 40,354	$ 17,665	$ 48,014