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Summary of Company's Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 23,683 | $ 14,195 | $ 20,558 | $ 15,285 | $ 16,314 | $ 17,678 | $ 14,931 | $ 13,137 | $ 73,721 | $ 62,060 | $ 84,867
Income (loss) from operations | $ (18,178) | $ (13,774) | $ (11,060) | $ (11,311) | $ (14,816) | $ (12,015) | $ (13,987) | $ (14,692) | (54,323) | (55,510) | (52,555)
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 50,300 | 37,538 | 25,929
Interest income |  |  |  |  |  |  |  |  | 653 | 376 | 427
Interest expense |  |  |  |  |  |  |  |  | 39 | 26 | 229
Operating Segments | Seismic |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 47,109 | 33,792 | 60,565
Income (loss) from operations |  |  |  |  |  |  |  |  | (46,902) | (47,690) | (42,732)
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 47,620 | 34,945 | 23,696
Interest income |  |  |  |  |  |  |  |  | 311 | 161 | 280
Operating Segments | Non-seismic |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 26,027 | 27,708 | 23,758
Income (loss) from operations |  |  |  |  |  |  |  |  | 4,153 | 4,093 | 3,031
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 785 | 746 | 505
Interest income |  |  |  |  |  |  |  |  |  | 3 | 7
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 585 | 560 | 544
Income (loss) from operations |  |  |  |  |  |  |  |  | (11,574) | (11,913) | (12,854)
Depreciation, impairment, inventory obsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 1,895 | 1,847 | 1,728
Interest income |  |  |  |  |  |  |  |  | 342 | 212 | 140
Interest expense |  |  |  |  |  |  |  |  | $ 39 | $ 26 | $ 229

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