Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 14,931	$ 27,942	$ 28,068	$ 49,108
Income (loss) from operations	(13,987)	(8,549)	(28,679)	(18,437)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenue	143	142	273	284
Income (loss) from operations	(3,001)	(3,307)	(6,120)	(6,668)
Seismic | Operating Segments
Segment Reporting Information [Line Items]
Revenue	8,501	22,781	16,075	38,374
Income (loss) from operations	(11,834)	(5,744)	(23,969)	(13,129)
Non-Seismic | Operating Segments
Segment Reporting Information [Line Items]
Revenue	6,287	5,019	11,720	10,450
Income (loss) from operations	$ 848	$ 502	$ 1,410	$ 1,360