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Summary of Company's Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 16,314 | $ 17,678 | $ 14,931 | $ 13,137 | $ 16,008 | $ 19,751 | $ 27,942 | $ 21,166 | $ 62,060 | $ 84,867 | $ 236,912
Income (loss) from operations | $ (14,816) | $ (12,015) | $ (13,987) | $ (14,692) | $ (21,667) | $ (12,451) | $ (8,549) | $ (9,888) | (55,510) | (52,555) | 53,799
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 36,538 | 25,929 | 21,893
Interest income |  |  |  |  |  |  |  |  | 376 | 427 | 123
Interest expense |  |  |  |  |  |  |  |  | 26 | 229 | 471
Operating Segments | Seismic |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 33,792 | 60,565 | 214,946
Income (loss) from operations |  |  |  |  |  |  |  |  | (47,690) | (42,732) | 65,159
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 34,945 | 23,696 | 19,925
Interest income |  |  |  |  |  |  |  |  | 161 | 280 | 74
Operating Segments | Non-seismic |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 27,708 | 23,758 | 21,420
Income (loss) from operations |  |  |  |  |  |  |  |  | 4,093 | 3,031 | 2,733
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 746 | 505 | 468
Interest income |  |  |  |  |  |  |  |  | 3 | 7 | 5
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 560 | 544 | 546
Income (loss) from operations |  |  |  |  |  |  |  |  | (11,913) | (12,854) | (14,093)
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 1,847 | 1,728 | 1,500
Interest income |  |  |  |  |  |  |  |  | 212 | 140 | 44
Interest expense |  |  |  |  |  |  |  |  | $ 26 | $ 229 | $ 471

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