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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 | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 13,463 | $ 17,679 | $ 48,060 | $ 66,005
Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 13,463 | 17,679 | 48,060 | 66,005
Operating Segments | Oil and Gas Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 2,384 | 7,284 | 19,260 | 32,224
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 1,592 | 1,949 | 3,389 | 3,736
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 100 | 4,264 | 14,358 | 26,923
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 692 | 1,071 | 1,513 | 1,565
Operating Segments | Adjacent Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 10,894 | 9,334 | 28,179 | 23,758
Operating Segments | Adjacent Markets | Industrial Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 7,465 | 6,451 | 18,471 | 15,835
Operating Segments | Adjacent Markets | Imaging Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,429 | 2,883 | 9,708 | 7,923
Operating Segments | Emerging Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 135 | $ 1,061 | 571 | $ 10,023
Operating Segments | Corporate |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 50 |  | $ 50 |

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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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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