Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Accumulated Other Comprehensive Income.
Balance	$ 59,660
Balance	46,533	$ 59,660
Foreign Currency Items
Accumulated Other Comprehensive Income.
Balance	1,121	1,168
Other comprehensive income (loss) before reclassifications	33	(47)
Net current period other comprehensive income (loss)		(47)
Balance	1,154	1,121
Unrealized Gains and (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income.
Balance	(15)	(77)
Other comprehensive income (loss) before reclassifications	(74)	63
Amounts reclassified from accumulated other comprehensive loss		(1)
Net current period other comprehensive income (loss)		62
Balance	(89)	(15)
Change in Defined Pension Benefit Obligation
Accumulated Other Comprehensive Income.
Balance	(2,066)	(1,517)
Other comprehensive income (loss) before reclassifications	949	(549)
Net current period other comprehensive income (loss)		(549)
Balance	(1,117)	(2,066)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income.
Balance	(960)	(426)
Other comprehensive income (loss) before reclassifications	908	(533)
Amounts reclassified from accumulated other comprehensive loss		(1)
Net current period other comprehensive income (loss)		(534)
Balance	$ (52)	$ (960)