XML 53 R42.htm IDEA: XBRL DOCUMENT
v3.21.2

Changes in Fair Value of Company Level 3 Financial Instruments (Details) - Nonrecurring - Significant Unobservable (Level 3) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Balance | $ 10,044 | $ 10,265 | $ 10,962
Fair value adjustments | (795) | (221) | (697)
Balance | $ 9,249 | $ 10,044 | $ 10,265

X
- Definition Fair value measurement with unobservable inputs reconciliation nonrecurring basis liability fair value adjustments. + References No definition available. + Details
Name: | geos_FairValueMeasurementWithUnobservableInputsReconciliationNonrecurringBasisLiabilityFairValueAdjustments
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value measurement with unobservable inputs reconciliations nonrecurring basis liability value. + References No definition available. + Details
Name: | geos_FairValueMeasurementWithUnobservableInputsReconciliationsNonrecurringBasisLiabilityValue
Namespace Prefix: | geos_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |