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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Financial Instruments (Details) $ in Thousands | 6 Months Ended
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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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