CONSOLIDATED FINANCIAL STATEMENT DETAILS - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 855,044	$ 390,565	$ 402,914	$ 336,984
Restricted cash included in other current assets	392	504	1,421	1,417
Restricted cash included in other non-current assets	429	409	403	420
Total cash and cash equivalents, and restricted cash as shown on the consolidated statement of cash flows	$ 855,865	$ 391,478	$ 404,738	$ 338,821