Stockholders' Equity and Employee Benefit Plans - Summary of Stock-based Compensation Expense Recognized in Financial Statements (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 25, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized	$ 89,900	$ 131,770	$ 34,986	$ 32,957
Capitalized stock-based compensation expense		2,609	3,119	6,090
Stock-based compensation expense		134,379	38,105	39,047
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		8,931	2,503	4,114
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		48,739	9,918	5,756
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		19,046	8,069	8,712
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		55,054	14,496	12,301
Restructuring
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, net of amounts capitalized		$ 0	$ 0	$ 2,074