MARKETABLE SECURITIES - Schedule of Gross Unrealized Losses And Fair Value of Available For Sale Securities (Details) $ in Thousands	Sep. 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	$ 74,990
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	0
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	74,990
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	0
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	49,996
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	0
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	49,996
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	0
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	49,996
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	0
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	49,996
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	0
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	24,994
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	0
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	24,994
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	0
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	24,994
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position for less than twelve months	0
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	24,994
Total gross unrealized losses of available-for-sale securities in a continuous unrealized loss position	$ 0