Summary of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Schedule Of Revenues From External Customers [Line Items]
Revenue	$ 16,314	$ 17,678	$ 14,931	$ 13,137	$ 16,008	$ 19,751	$ 27,942	$ 21,166	$ 62,060	$ 84,867	$ 236,912
Asia (including Middle East)
Schedule Of Revenues From External Customers [Line Items]
Revenue									18,745	8,755	5,028
Canada
Schedule Of Revenues From External Customers [Line Items]
Revenue									3,048	2,298	42,632
Europe
Schedule Of Revenues From External Customers [Line Items]
Revenue									4,219	13,672	71,713
Middle East
Schedule Of Revenues From External Customers [Line Items]
Revenue									1,749	2,024	7,550
United States
Schedule Of Revenues From External Customers [Line Items]
Revenue									32,317	50,101	96,380
Other
Schedule Of Revenues From External Customers [Line Items]
Revenue									$ 1,982	$ 8,017	$ 13,609