Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 14,195	$ 17,678	$ 50,038	$ 45,746
Income (loss) from operations	(13,774)	(12,015)	(36,145)	(40,694)
Operating Segments | Seismic
Segment Reporting Information [Line Items]
Revenue	7,308	9,567	30,658	25,642
Income (loss) from operations	(11,972)	(10,263)	(30,581)	(34,232)
Operating Segments | Non-Seismic
Segment Reporting Information [Line Items]
Revenue	6,741	7,967	18,945	19,687
Income (loss) from operations	1,004	1,194	3,108	2,604
Corporate
Segment Reporting Information [Line Items]
Revenue	146	144	435	417
Income (loss) from operations	$ (2,806)	$ (2,946)	$ (8,672)	$ (9,066)