Details of Revenue (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
Revenues From External Customers And Long Lived Assets [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
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									56,094	77,487	230,818
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									3,028	4,796	39,064
Colombia
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									556	609	3,222
Russian Federation
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									4,254	5,554	14,048
United Kingdom
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									2,120	2,644	2,229
Eliminations
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue									$ (3,992)	$ (6,223)	$ (52,469)