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Investments - Carrying Value (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Jun. 30, 2017
--- | --- | ---
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | $ 11,490 | $ 12,890
Held-to-maturity securities, maturities from 91-360 days | 250 | 250
Held-to-maturity securities, maturities less than 1 year | 1,654 | 1,607
Held-to-maturity securities, maturities over 360 days | 547 | 549
Held-to-maturity securities, remaining maturities from 1-3 years | 881 | 1,441
Short-Term Investments |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Total available-for-sale and held-to-maturity securities | 10,062 | 10,900
Long-Term Investments |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 1,428 | 1,990
Mutual Funds - Corporate & Government Debt |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | 8,158 | 9,043
Mutual Funds - Corporate & Government Debt | Short-Term Investments |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | 8,158 | 9,043
Mutual Funds - Corporate & Government Debt | Long-Term Investments |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | 0 | 0
Time Deposits |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | 797 | 799
Time Deposits | Short-Term Investments |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities, maturities from 1-90 days | 0 | 0
Held-to-maturity securities, maturities from 91-360 days | 250 | 250
Held-to-maturity securities, maturities over 360 days | 0 | 0
Time Deposits | Long-Term Investments |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities, maturities from 1-90 days | 0 | 0
Held-to-maturity securities, maturities from 91-360 days | 0 | 0
Held-to-maturity securities, maturities over 360 days | 547 | 549
Fixed Income Bonds |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Available-for-sale securities, current | 2,535 | 3,048
Fixed Income Bonds | Short-Term Investments |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities, maturities less than 1 year | 1,654 | 1,607
Held-to-maturity securities, remaining maturities from 1-3 years | 0 | 0
Held-to-maturity Securities, Debt Maturities, after Three Through Five Years, Net Carrying Amount | 0 | 0
Fixed Income Bonds | Long-Term Investments |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities, maturities less than 1 year | 0 | 0
Held-to-maturity securities, remaining maturities from 1-3 years | 881 | 1,441
Held-to-maturity Securities, Debt Maturities, after Three Through Five Years, Net Carrying Amount | $ 0 | $ 0

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