THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred revenue	$ 262,968,000	$ 239,088,000
Deferred revenue recognized	234,900,000
Noncurrent deferred revenue	$ 0	$ 0