Summary of Significant Accounting Policies - Revenue by Geographic Regions and Significant Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information
Total revenues	$ 49,482	$ 48,947	$ 98,609	$ 103,841
Americas
Segment Reporting Information
Total revenues	36,903	37,613	73,066	77,748
Asia/Pacific & Europe
Segment Reporting Information
Total revenues	12,579	11,334	25,543	26,093
United States
Segment Reporting Information
Total revenues	34,814	35,535	68,929	74,153
Japan
Segment Reporting Information
Total revenues	$ 10,383	$ 9,498	$ 21,240	$ 20,105