Segment Reporting and Geographic Information - Additional Information (Details)	3 Months Ended
	Sep. 30, 2018 customer segment	Sep. 30, 2017 customer	Jun. 30, 2018 customer
Segment Reporting Information
Number of reportable segments | segment	1
Number of customers with significant revenue	2	1
Segment percent of total revenues	100.00%	100.00%
Number of customers with significant accounts receivable balance	1		3
Customer One
Segment Reporting Information
Segment percent of total revenues	15.00%	28.00%
Customer Two
Segment Reporting Information
Segment percent of total revenues	10.00%