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Revenue Recognition - Summary of Revenue from the Sale of Products and Performance of Services Under Contracts with Customers Excludes All Revenue Earned from Rental Contracts by Operating Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 9,517 | $ 11,845 | $ 18,600 | $ 22,304
Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 9,517 | 11,845 | 18,600 | 22,304
Operating Segments | Oil and Gas Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,073 | 4,565 | 4,987 | 8,323
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 1,257 | 3,261 | 3,587 | 5,987
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 479 | 310 | 883 | 454
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 337 | 994 | 517 | 1,882
Operating Segments | Adjacent Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 7,072 | 7,234 | 13,144 | 13,847
Operating Segments | Adjacent Markets | Industrial Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 4,186 | 4,120 | 7,782 | 7,682
Operating Segments | Adjacent Markets | Imaging Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,886 | 3,114 | 5,362 | 6,165
Operating Segments | Emerging Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 372 | $ 46 | $ 469 | $ 134

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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