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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Financial Instruments (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2018 USD ($)
Marketable Securities [Line Items]
Adjusted Cost	$ 151,061
Fair Value	150,913
Fair value, measurements, recurring
Marketable Securities [Line Items]
Adjusted Cost	151,061
Gross Unrealized Gains	24
Gross Unrealized Losses	(172)
Fair Value	150,913
Cash and Cash Equivalents	5,128
Short-Term Investments	103,489
Long-Term Investments	42,296
Fair value, measurements, recurring | Fair value, inputs, level 1
Marketable Securities [Line Items]
Adjusted Cost	4,378
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	4,378
Cash and Cash Equivalents	4,378
Short-Term Investments	0
Long-Term Investments	0
Fair value, measurements, recurring | Fair value, inputs, level 2
Marketable Securities [Line Items]
Adjusted Cost	146,683
Gross Unrealized Gains	24
Gross Unrealized Losses	(172)
Fair Value	146,535
Cash and Cash Equivalents	750
Short-Term Investments	103,489
Long-Term Investments	42,296
Fair value, measurements, recurring | Money market funds | Fair value, inputs, level 1
Marketable Securities [Line Items]
Adjusted Cost	4,378
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	4,378
Cash and Cash Equivalents	4,378
Short-Term Investments	0
Long-Term Investments	0
Fair value, measurements, recurring | Commercial paper | Fair value, inputs, level 2
Marketable Securities [Line Items]
Adjusted Cost	2,581
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	2,581
Cash and Cash Equivalents	0
Short-Term Investments	2,581
Long-Term Investments	0
Fair value, measurements, recurring | Corporate securities | Fair value, inputs, level 2
Marketable Securities [Line Items]
Adjusted Cost	120,578
Gross Unrealized Gains	23
Gross Unrealized Losses	(163)
Fair Value	120,438
Cash and Cash Equivalents	0
Short-Term Investments	82,889
Long-Term Investments	37,549
Fair value, measurements, recurring | U.S agency securities | Fair value, inputs, level 2
Marketable Securities [Line Items]
Adjusted Cost	7,083
Gross Unrealized Gains	0
Gross Unrealized Losses	(4)
Fair Value	7,079
Cash and Cash Equivalents	0
Short-Term Investments	7,079
Long-Term Investments	0
Fair value, measurements, recurring | US Government Bonds | Fair value, inputs, level 2
Marketable Securities [Line Items]
Adjusted Cost	16,441
Gross Unrealized Gains	1
Gross Unrealized Losses	(5)
Fair Value	16,437
Cash and Cash Equivalents	750
Short-Term Investments	10,940
Long-Term Investments	$ 4,747

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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