Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Stock-based compensation	$ 543,953	$ 394,004	[1]	$ 317,654	[1]
Sales and marketing
Stock-based compensation	228,045	170,527	[2]	131,571	[2]
Research and development
Stock-based compensation	135,203	92,025	[2]	81,731	[2]
General and administrative
Stock-based compensation	99,151	68,717	[2]	49,416	[2]
Total subscription revenues | Cost of revenues
Stock-based compensation	48,738	35,334	[2]	28,420	[2]
Professional services and other | Cost of revenues
Stock-based compensation	$ 32,816	$ 27,401	[2]	$ 26,516	[2]

[1] As adjusted to reflect the impact of the full retrospective adoption of Topic 606.

[2] As adjusted to reflect the impact of the full retrospective adoption of Topic 606.