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EQUITY AWARD PLANS - Additional Information (Details)
 1 Months Ended 3 Months Ended
Aug. 01, 2017
shares
Dec. 12, 2017
shares
Dec. 08, 2017
$ / shares
Sep. 30, 2016
USD ($)
purchase_period
shares
Oct. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercises in period (in shares)         2,580,224  
Weighted average exercise price (in dollars per share) | $ / shares         $ 3.09  
Options outstanding (in shares)         17,656,096  
Compensation not yet recognized | $         $ 272,600,000  
Period for recognition (in years)         2 years 1 month 28 days  
2016 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (in shares)         56,636,515  
Number of shares available for grant (in shares)         22,201,692  
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSUs granted (in shares)         1,553,392  
RSUs granted (in dollars per share) | $ / shares         $ 23.72  
Employee Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant (in shares)         2,839,207  
Percent of eligible compensation (up to)       15.00%    
Monetary cap | $       $ 25,000    
Share cap (in shares)       1,000    
Offering period duration (in months)       12 months    
Number of six-month purchase periods | purchase_period       2    
Purchase price of common stock, percent       85.00%    
Stock repurchased during period (in shares)         1,261,104  
Stock repurchased during period, value | $         $ 17,400,000  
Common Class A | 2016 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (in shares)           22,400,000
Annual increase (in shares)         18,000,000  
Annual increase, percent of outstanding shares         5.00%  
Number of additional shares authorized 7,731,826          
Common Class A | Employee Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for future issuance (in shares)       3,800,000    
Annual increase (in shares)       3,800,000    
Annual increase, percent of outstanding shares       1.00%    
Number of additional shares authorized 1,546,365          
Subsequent Event | RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSUs granted (in shares)   7,311,448        
RSUs granted (in dollars per share) | $ / shares     $ 34.39