Summary of Significant Accounting Policies - Revenue by Geographic Regions and Significant Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information
Total revenues	$ 50,562	$ 45,007	$ 149,171	$ 148,848
Americas
Segment Reporting Information
Total revenues	38,026	34,379	111,092	112,127
Asia/Pacific & Europe
Segment Reporting Information
Total revenues	12,536	10,628	38,079	36,721
United States
Segment Reporting Information
Total revenues	35,585	33,681	104,514	107,834
Japan
Segment Reporting Information
Total revenues	$ 10,064	$ 9,141	$ 31,303	$ 29,246