Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 17,678	$ 19,751	$ 45,746	$ 68,859
Income (loss) from operations	(12,015)	(12,451)	(40,694)	(30,888)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenue	144	115	417	399
Income (loss) from operations	(2,946)	(3,169)	(9,066)	(9,837)
Seismic | Operating Segments
Segment Reporting Information [Line Items]
Revenue	9,567	13,538	25,642	51,912
Income (loss) from operations	(10,263)	(10,253)	(34,232)	(23,382)
Non-Seismic | Operating Segments
Segment Reporting Information [Line Items]
Revenue	7,967	6,098	19,687	16,548
Income (loss) from operations	$ 1,194	$ 971	$ 2,604	$ 2,331