MARKETABLE SECURITIES - Schedule of Gross Unrealized Losses And Fair Value of Available For Sale Securities (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Marketable Securities [Line Items]
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months	$ 181,909
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	(3)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer, accumulated loss	0
Total fair value of available-for-sale securities in a continuous unrealized loss position	181,909
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	(3)
Cash equivalents
Marketable Securities [Line Items]
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months	81,934
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	(2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer, accumulated loss	0
Total fair value of available-for-sale securities in a continuous unrealized loss position	81,934
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	(2)
Cash equivalents | U.S. government agency securities
Marketable Securities [Line Items]
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months	81,934
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	(2)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer, accumulated loss	0
Total fair value of available-for-sale securities in a continuous unrealized loss position	81,934
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	(2)
Marketable securities
Marketable Securities [Line Items]
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months	99,975
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	(1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer, accumulated loss	0
Total fair value of available-for-sale securities in a continuous unrealized loss position	99,975
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	(1)
Marketable securities | U.S. government agency securities
Marketable Securities [Line Items]
Total fair value of available-for-sale securities in a continuous unrealized loss position for less than twelve months	99,975
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	(1)
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer	0
Debt securities, available-for-sale, continuous unrealized loss position, 12 months of longer, accumulated loss	0
Total fair value of available-for-sale securities in a continuous unrealized loss position	99,975
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	$ (1)