Intangible Assets, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Total intangible assets, net	$ 1,115	$ 1,247
Amortization of intangible assets	$ 100	100	$ 100
Definite-lived intangible assets weighted-average amortization period	6 years 9 months
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2019	$ 100
2020	100
2021	100
2022	100
2023	100
Patent costs
Finite-Lived Intangible Assets [Line Items]
Patent costs	2,330	2,330
Accumulated amortization	(1,460)	(1,328)
Total definite-lived intangible assets, net	870	1,002
Trademark costs
Finite-Lived Intangible Assets [Line Items]
Trademarks and other indefinite-lived intangible assets	$ 245	$ 245