THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 667,612	$ 544,642
Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	655,181	534,824
Indirect Revenue (principally advertising revenue)
Disaggregation of Revenue [Line Items]
Revenue	12,431	9,818
North America | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	326,829	263,347
International | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 328,352	$ 271,477