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Stock Plan - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Apr. 14, 2017
May 31, 2015
Jul. 01, 2017
Employee Stock Options And Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to unvested options     $ 267.9
Unrecognized compensation expense related to unvested options, estimated weighted average period     2 years 3 months 18 days
Common Class A [Member] | 2015 Equity Incentive Plan [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for future issuance (in shares)     14,300,000
Common Class A [Member] | 2015 Employee Stock Purchase Plan [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock reserved for future issuance (in shares)   3,800,000  
Percent of share price available to employees   85.00%  
Offering period   6 months  
Eligible Employees [Member] | 2015 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unfunded right to receive stock on a date in time in the future (in shares) 1