Summary of Significant Accounting Policies - Revenues by Geographic Area (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2017 USD ($) Segment	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of geographic segments | Segment									2
Revenues from unaffiliated customers
Total revenues	$ 50,641	$ 45,007	$ 48,947	$ 54,894	$ 53,033	$ 56,160	$ 51,995	$ 45,352	$ 199,489	$ 206,540	$ 190,336
Americas
Revenues from unaffiliated customers
Total revenues									150,841	158,291	138,118
Asia/Pacific & Europe
Revenues from unaffiliated customers
Total revenues									48,648	48,249	52,218
United States
Segment Reporting Information [Line Items]
Long-lived assets	6,200				4,200				6,200	4,200
Revenues from unaffiliated customers
Total revenues									144,842	152,830	132,831
Japan
Segment Reporting Information [Line Items]
Long-lived assets	$ 900				$ 1,300				900	1,300
Revenues from unaffiliated customers
Total revenues									$ 39,390	$ 36,343	$ 41,428