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Summary of Company's Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 20,587 | $ 21,270 | $ 19,247 | $ 14,644 | $ 23,683 | $ 14,195 | $ 20,558 | $ 15,285 | $ 75,748 | $ 73,721 | $ 62,060
Income (loss) from operations | $ (780) | $ (5,136) | $ (5,222) | $ (9,605) | $ (18,178) | $ (13,774) | $ (11,060) | $ (11,311) | (20,743) | (54,323) | (55,510)
Depreciation, amortization, impairment, inventoryobsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 21,656 | 50,300 | 37,538
Interest income |  |  |  |  |  |  |  |  | 1,083 | 653 | 376
Interest expense |  |  |  |  |  |  |  |  | 336 | 39 | 26
Operating Segments | Oil and Gas Markets |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 44,951 | 47,109 | 33,792
Income (loss) from operations |  |  |  |  |  |  |  |  | (14,070) | (46,902) | (47,690)
Depreciation, amortization, impairment, inventoryobsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 19,592 | 47,620 | 34,945
Interest income |  |  |  |  |  |  |  |  | 614 | 311 | 161
Interest expense |  |  |  |  |  |  |  |  | 2 |  |
Operating Segments | Adjacent Markets |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 29,932 | 26,027 | 27,708
Income (loss) from operations |  |  |  |  |  |  |  |  | 5,345 | 4,153 | 4,093
Depreciation, amortization, impairment, inventoryobsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 654 | 785 | 746
Interest income |  |  |  |  |  |  |  |  |  |  | 3
Operating Segments | Emerging Markets |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 286 |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | (718) |  |
Depreciation, amortization, impairment, inventoryobsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 207 |  |
Interest expense |  |  |  |  |  |  |  |  | 1 |  |
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 579 | 585 | 560
Income (loss) from operations |  |  |  |  |  |  |  |  | (11,300) | (11,574) | (11,913)
Depreciation, amortization, impairment, inventoryobsolescence and stock-based compensation expenses |  |  |  |  |  |  |  |  | 1,203 | 1,895 | 1,847
Interest income |  |  |  |  |  |  |  |  | 469 | 342 | 212
Interest expense |  |  |  |  |  |  |  |  | $ 333 | $ 39 | $ 26

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