Summary of Company's Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 20,558	$ 14,931	$ 35,843	$ 28,068
Income (loss) from operations	(11,060)	(13,987)	(22,371)	(28,679)
Operating Segments | Seismic
Segment Reporting Information [Line Items]
Revenue	13,944	8,501	23,350	16,075
Income (loss) from operations	(9,156)	(11,834)	(18,609)	(23,969)
Operating Segments | Non-Seismic
Segment Reporting Information [Line Items]
Revenue	6,468	6,287	12,204	11,720
Income (loss) from operations	1,052	848	2,104	1,410
Corporate
Segment Reporting Information [Line Items]
Revenue	146	143	289	273
Income (loss) from operations	$ (2,956)	$ (3,001)	$ (5,866)	$ (6,120)