Investments - Carrying Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Available-for-sale securities, current	$ 8,533	$ 12,890
Held-to-maturity securities, maturities from 91-360 days	251	250
Held-to-maturity securities, maturities less than 1 year	1,627	1,607
Held-to-maturity securities, maturities over 360 days	546	549
Held-to-maturity securities, remaining maturities from 1-3 years	709	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	7,278	10,900
Long-Term Investments
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Held-to-maturity securities	1,255	1,990
Mutual Funds - Corporate & Government Debt
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Available-for-sale securities, current	5,400	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	5,400	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	251	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	546	549
Fixed Income Bonds
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]
Available-for-sale securities, current	2,336	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	1,627	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	709	1,441
Held-to-maturity Securities, Debt Maturities, after Three Through Five Years, Net Carrying Amount	$ 0	$ 0