Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 15,285	$ 13,137
Income (loss) from operations	(11,311)	(14,692)
Operating Segments | Seismic
Segment Reporting Information [Line Items]
Revenue	9,406	7,574
Income (loss) from operations	(9,453)	(12,135)
Operating Segments | Non-Seismic
Segment Reporting Information [Line Items]
Revenue	5,736	5,433
Income (loss) from operations	1,052	562
Corporate
Segment Reporting Information [Line Items]
Revenue	143	130
Income (loss) from operations	$ (2,910)	$ (3,119)