Segment and Geographical Information - Narrative (Detail)	3 Months Ended		9 Months Ended
	Mar. 31, 2017 Customer	Mar. 31, 2016	Sep. 30, 2016 Customer Segment
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments | Segment			1
Revenue | Customer Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of individual customer			1
United States | Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	43.00%	42.00%
Germany | Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	15.00%	14.00%	14.00%
United Kingdom | Revenue | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			10.00%
Customer A | Revenue | Customer Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	10.00%
Number of individual customer	1