Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 13,137	$ 21,166
Income (loss) from operations	(14,692)	(9,888)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenue	130	142
Income (loss) from operations	(3,119)	(3,361)
Seismic | Operating Segments
Segment Reporting Information [Line Items]
Revenue	7,574	15,593
Income (loss) from operations	(12,135)	(7,385)
Non-Seismic | Operating Segments
Segment Reporting Information [Line Items]
Revenue	5,433	5,431
Income (loss) from operations	$ 562	$ 858