XML 47 R34.htm IDEA: XBRL DOCUMENT
v3.19.1

Summary of Revenue from the Sale of Products and 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, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 11,845 | $ 13,910 | $ 22,304 | $ 27,184
Operating Segments |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 11,845 | 13,910 | 22,304 | 27,184
Operating Segments | Oil and Gas Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 4,565 | 6,108 | 8,323 | 12,948
Operating Segments | Oil and Gas Markets | Traditional Exploration Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,261 | 2,490 | 5,987 | 6,089
Operating Segments | Oil and Gas Markets | Wireless Exploration Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 310 | 1,558 | 454 | 4,181
Operating Segments | Oil and Gas Markets | Reservoir Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 994 | 2,060 | 1,882 | 2,678
Operating Segments | Adjacent Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 7,234 | 7,802 | 13,847 | 14,236
Operating Segments | Adjacent Markets | Industrial Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 4,120 | 4,711 | 7,682 | 8,387
Operating Segments | Adjacent Markets | Imaging Product Revenue |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 3,114 | $ 3,091 | 6,165 | $ 5,849
Operating Segments | Emerging Markets |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 46 |  | $ 134 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=geos_OilAndGasMarketMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=geos_TraditionalExplorationProductRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=geos_WirelessExplorationProductRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=geos_ReservoirProductRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=geos_AdjacentMarketsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=geos_IndustrialProductRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=geos_ImagingProductRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=geos_EmergingMarketsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |