75000 - Document - Document And Entity Information
link:presentationLink
link:calculationLink
link:definitionLink
75010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Current Period Unaudited)
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link:calculationLink
link:definitionLink
75020 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Current Period Unaudited) (Parentheticals)
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75030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited)
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75040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited)
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75050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)
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75060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (Parentheticals)
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995455 - Disclosure - Operations
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995465 - Disclosure - Basis of Presentation and Significant Accounting Policies
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995475 - Disclosure - Recent Accounting Pronouncements
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995485 - Disclosure - Revenue Recognition
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995495 - Disclosure - Fair Value Measurements
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995505 - Disclosure - Inventories, Net
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995515 - Disclosure - Property and Equipment, Net
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995525 - Disclosure - Goodwill and Intangible Assets
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995535 - Disclosure - Prepaid Expenses and Other
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995545 - Disclosure - Accrued and Other Liabilities
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995555 - Disclosure - Term Loans and Warrant Liabilities
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995565 - Disclosure - Leases
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995575 - Disclosure - Income Taxes
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995585 - Disclosure - Commitments and Contingencies
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995595 - Disclosure - Share-Based Compensation
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995605 - Disclosure - Stockholders' Equity
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995615 - Disclosure - Net Loss Per Share
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995625 - Disclosure - Segment Information
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995635 - Disclosure - Major Customers, Suppliers and Related Information
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995645 - Disclosure - Subsequent Events
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995655 - Disclosure - Basis of Presentation and Significant Accounting Policies (Policies)
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995665 - Disclosure - Revenue Recognition (Tables)
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995675 - Disclosure - Fair Value Measurements (Tables)
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995685 - Disclosure - Inventories, Net (Tables)
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link:calculationLink
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995695 - Disclosure - Property and Equipment, Net (Tables)
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995705 - Disclosure - Goodwill and Intangible Assets (Tables)
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link:calculationLink
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995715 - Disclosure - Prepaid Expenses and Other (Tables)
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link:calculationLink
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995725 - Disclosure - Accrued and Other Liabilities (Tables)
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link:calculationLink
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995735 - Disclosure - Term Loans and Warrant Liabilities (Tables)
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995745 - Disclosure - Leases (Tables)
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995755 - Disclosure - Share-Based Compensation (Tables)
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995765 - Disclosure - Stockholders' Equity (Tables)
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995775 - Disclosure - Net Loss Per Share (Tables)
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995785 - Disclosure - Segment Information (Tables)
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995795 - Disclosure - Major Customers, Suppliers and Related Information (Tables)
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995805 - Disclosure - Basis of Presentation and Significant Accounting Policies - Additional information (Details)
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995815 - Disclosure - Recent Accounting Pronouncements - Additional Information (Details)
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995825 - Disclosure - Revenue Recognition - Additional Information (Details 1)
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995835 - Disclosure - Revenue Recognition - Additional Information (Details 2)
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995835 - Disclosure - Revenue Recognition - Additional Information (Details 2) [Default]
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995845 - Disclosure - Revenue Recognition - Schedule of Contract Asset and Contract Liabilities (Details)
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995855 - Disclosure - Fair Value Measurements - Fair Value by Major Security Type (Details)
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995865 - Disclosure - Fair Value Measurements - Additional Information (Details)
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995875 - Disclosure - Fair Value Measurements - Fair Value Measurement of Acquired Intangible Assets (Details)
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995885 - Disclosure - Inventories, Net - Schedule of Inventory, Net (Details)
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995895 - Disclosure - Property and Equipment, Net - Schedule of Property and Equipment, Net (Details)
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995905 - Disclosure - Property and Equipment, Net - Additional Information (Details)
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995915 - Disclosure - Goodwill and Intangible Assets - Additional Information (Details)
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995925 - Disclosure - Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details)
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995935 - Disclosure - Goodwill and Intangible Assets - Summary of Intangible Assets (Details)
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995945 - Disclosure - Goodwill and Intangible Assets - Estimated Future Amortization Expense (Details)
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995955 - Disclosure - Prepaid Expenses and Other - Summary of Prepaid Expenses and Other Current Assets (Details)
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995965 - Disclosure - Prepaid Expenses and Other - Additional Information (Details)
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995975 - Disclosure - Accrued and Other Liabilities - Summary of Accrued Liabilities (Details)
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995985 - Disclosure - Accrued and Other Liabilities - Additional Information (Details)
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995995 - Disclosure - Accrued and Other Liabilities - Summary of Changes in Warranty Reserve and Extended Warranty (Details)
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996005 - Disclosure - Term Loans and Warrant Liabilities - Additional Information (Details)
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996015 - Disclosure - Term Loans and Warrant Liabilities - Summary of Changes in Fair Value of Term Loan and First Amendment Term Loan Level 3 (Details)
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996025 - Disclosure - Term Loans and Warrant Liabilities - Summary of Fair Value Assumptions Applied in Determining Initial Fair Value and Subsequent Fair Value of Warrant Liabilities (Details)
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996035 - Disclosure - Term Loans and Warrant Liabilities - Summary of Changes in Fair Value of Warrant Liabilities Level 3 (Details)
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996045 - Disclosure - Term Loans and Warrant Liabilities - Schedule of Outstanding Principal Amount and Carrying Value of Term Loan (Details)
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996055 - Disclosure - Leases - Summary of Operating ROU Assets and Liabilities (Details)
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996065 - Disclosure - Leases - Additional Information (Details)
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996075 - Disclosure - Leases - Summary of Maturities of Operating Lease Liabilities (Details)
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996085 - Disclosure - Leases - Summary of Maturities of Operating Lease Liabilities (Details) 2
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996095 - Disclosure - Income Taxes - Additional Information (Details)
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996105 - Disclosure - Share-Based Compensation - Additional Information (Details)
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996115 - Disclosure - Share-Based Compensation - Summary of Stock Option Activity (Details)
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996125 - Disclosure - Share-Based Compensation - Summary of Stock Options Outstanding (Details)
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996135 - Disclosure - Share-Based Compensation - Summary of Weighted-Average Assumptions (Details)
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996145 - Disclosure - Share-Based Compensation - Summary of Company's RSU Activity (Details)
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996155 - Disclosure - Share-Based Compensation - Summary of Share-based Compensation Expense (Details)
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996165 - Disclosure - Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details)
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996175 - Disclosure - Stockholders' Equity - Additional Information (Details)
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996185 - Disclosure - Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share (Details)
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996195 - Disclosure - Segment Information - Additional Information (Details)
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996205 - Disclosure - Segment Information - Schedule of Segment Reporting Information by Segment (Details)
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996215 - Disclosure - Segment Information - Schedule of Segment Reporting Information by Segment (Long-Lived Assets) (Details)
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996225 - Disclosure - Major Customers, Suppliers and Related Information - Additional Information (Details)
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996235 - Disclosure - Major Customers, Suppliers and Related Information - Schedule of Revenues by Geographic Region (Details)
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996245 - Disclosure - Major Customers, Suppliers and Related Information - Schedule of Long Lived Assets by Geographic Region (Details)
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996255 - Disclosure - Subsequent Events - Additional Information (Details)
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Vested, weighted average grant date fair value (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share)
Represents the number of wholly owned subsidiaries of the reporting entity as of a certain date.
gnss_NumberOfWhollyOwnedSubsidiaries
Number of wholly owned subsidiaries
Segments [Domain]
Concentration Risk Type [Axis]
Schedule of Revenues from External Customers and Long-Lived Assets [Table]
Entity Incorporation, State or Country Code
Preferred Stock, Shares Issued (in shares)
Preferred stock, shares issued (in shares)
us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Balance
Balance
us-gaap_IncreaseDecreaseInAccountsPayable
Accounts payable
Represents hardware segment.
Hardware [Member]
Plan Name [Axis]
Equity [Abstract]
dei_EntityCurrentReportingStatus
Entity Current Reporting Status
Goodwill
Goodwill, Gross
Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by range four of exercise price.
Range Four [Member]
Operating expenses
Operating expenses:
Fair Value, Inputs, Level 2 [Member]
Level 2 [Member]
Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by range one of exercise price.
Range One [Member]
The amount of cash outflow for the acquisition of asset purchase holdback liability.
gnss_PaymentsToAcquireAssetPurchaseHoldbackLiability
Cash paid for asset purchase holdback liability
Rule 10b5-1 Arr Modified [Flag]
Rule 10b5-1 Arr Modified [Flag]
Commitments and Contingencies Disclosure [Text Block]
Commitments and Contingencies
mount of effect of exchange rate changes on operating lease liability.
gnss_EffectOfExchangeRateOnOperatingLeaseLiability
Effect of exchange rate on operating lease liabilities
us-gaap_CommonStockSharesAuthorized
Common stock, shares authorized (in shares)
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2030
Represents the software segment.
Software [Member]
Product and Service [Axis]
Fair Value by Liability Class [Domain]
Document Fiscal Period Focus
Debt Instrument, Interest Rate, Stated Percentage
Debt instrument, interest rate
Accounting Standards Update 2023-09 [Member]
ASU No. 2023-09
Revenue from Contract with Customer [Abstract]
dei_EntityShellCompany
Entity Shell Company
us-gaap_InventoryGross
Inventories, gross
Service [Member]
Cash and cash equivalents
Cash and cash equivalents
Cash and cash equivalents
Notes payable, at fair value - short term
Notes Payable, Current
Notes Payable, Current, Total
Amount of gross proceeds including cash proceeds and increase accounts receivable from exercise of stock options granted under share-based compensation arrangement.
gnss_GrossProceedsFromStockOptionsExercised
Gross Proceeds from Stock Options Exercised
Gross proceeds from stock options exercised
Common stock, shares, issued (in shares)
Accrued and Other Liabilities [Table]
Accrued and Other Liabilities.
Asset Class [Domain]
Statement [Table]
Long-term restricted cash
us-gaap_IncreaseDecreaseInPrepaidExpense
Prepaid expenses and other
Weighted average exercise price, outstanding balance (in dollars per share)
Weighted average exercise price, outstanding balance
Americas [Member]
Americas
Statement [Line Items]
Business Combination [Domain]
Warrant [Member]
Warrant [Member]
Entity Filer Category
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities and stockholders' (deficit) equity
Vehicles [Member]
Accrued and other liabilities
us-gaap_PaymentsToAcquireMarketableSecurities
Purchases of marketable securities
Exerciseable, weighted average exercise price (in dollars per share)
Weighted Average Exercise Price, Shares Exercisable (in dollars per share)
Long-Lived Tangible Asset [Axis]
Gross number of share options (or share units) exercised during the current period.
gnss_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrossExercisesInPeriod
Number of Shares Exercised (in shares)
Unrealized foreign currency gain (loss)
Debt Instrument, Frequency of Periodic Payment
Trade Names [Member]
Trade Name Portfolio [Member]
Proceeds from Issuance of Debt
Proceeds from issuance of debt
Proceeds from issuance of June Term Loan, net of $301 debt issuance cost
Cash Equivalents
Cash Equivalents
Exercise Price Range [Axis]
Warranty settlements
us-gaap_ProductWarrantyAccrualPayments
Subsequent Event [Line Items]
us-gaap_Goodwill
Goodwill
Balance as of September 30, 2025
Balance as of June 30, 2026
Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by range three of exercise price.
Range Three [Member]
us-gaap_EffectiveIncomeTaxRateContinuingOperations
Effective income tax rate
Employee Stock Option [Member]
Interest income
Investment Income, Interest
Geographical [Domain]
Finished goods
Finished goods
June Two Thousand Twenty Six Term Loan [Member]
June 2026 Term Loan.
June 2026 Term Loan [Member]
Schedule of Inventory, Current [Table Text Block]
Schedule of Inventory, Net
us-gaap_AllowanceForDoubtfulAccountsReceivable
Allowance for credit losses
Other assets
Property, Plant and Equipment [Line Items]
Concentration Risk [Table]
Customer Deposit
Customer deposit.
Customer deposit
Vesting [Domain]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Granted (in shares)
Share-based compensation arrangement by share-based payment award, options, grants in period, gross
Disaggregation of Revenue [Table]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Basic and Diluted Net Loss Per Share
Concentration Risk Disclosure [Text Block]
Major Customers, Suppliers and Related Information
The expense (benefit) charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.
Warranty provision
Warranty provision (settlement)
Earnings Per Share, Basic, Total
Net loss per common share - basic (in dollars per share)
Basic loss per share
Net loss per common share - basic
Repayments of Long-Term Debt
Repayments of Long-Term Debt, Total
Repayment of First Amendment Term Loan principal
Loss on disposition of fixed assets
Amount of gain ( loss ) on sale or disposal of fixed assets.
Loss on disposal of fixed asset
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Outstanding (in shares)
Outstanding (in shares)
Debt, Policy [Policy Text Block]
Term Loans
Customer Two [Member]
Customer two.
Customer Two
Acquisition
Finite-Lived Intangible Assets Acquired
us-gaap_LiabilitiesCurrent
Total current liabilities
us-gaap_IncreaseDecreaseInAccountsReceivable
Accounts receivable
Adjustments to reconcile net income to net cash used in operating activities:
Adjustments to reconcile net loss to net cash used in operating activities:
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Major Customer [Line Items]
Thereafter
Lessee Operating Lease Liability Payments Due After Year Four
Lessee operating lease liability payments due after year four.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Summary of Changes in Fair Value of Term Loan and First Amendment Term Loan Level 3
Trade shows and travel
Amount of consideration paid in advance for trade shows and travel that provides economic benefits within a future period of one year or the normal operating cycle, if longer.
gnss_PrepaidTradeShowsAndTravel
Proceeds from maturities of marketable securities
Payments of Debt Issuance Costs
Proceeds from issuance of June Term Loan, debt issuance cost
Accounting Standards Update [Axis]
Stockholders' Equity, Policy [Policy Text Block]
Warrants
Consolidation Items [Domain]
Stockholders' equity:
Stockholders' (deficit) equity:
Amount of effect of exchange rate changes on operating lease ROU assets.
Effect of exchange rate on operating lease ROU assets
Entity Small Business
Increase (Decrease) in Customer deposit
Increase (Decrease) in Customer deposit
Customer deposit
Amount of asset related to prepaid professional services.
gnss_PrepaidProfessionalServices
Prepaid professional services
Accumulated deficit
Nature of Operations [Text Block]
Operations
Measurement Input Risk-Free Rate [Member]
Measurement input risk-free rate.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value
Warrants and Rights Outstanding, Measurement Input
Warrants and rights outstanding, measurement input
Share-Based Payment Arrangement [Text Block]
Share-Based Compensation
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Note To Financial Statement Details Textual
Weighted Average Remaining Contractual Life (Year)
Weighted average remaining contractual life
Leases [Abstract]
us-gaap_InventoryValuationReserves
Reserve for obsolescence
us-gaap_ContractWithCustomerLiability
Balance as of September 30, 2025
Balance as of June 30, 2026
Amendment Flag
Product and Service [Domain]
Inventory Disclosure [Text Block]
Inventories, Net
us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Class of warrant or right, number of securities called by warrants or rights
Chief Executive Officer [Member]
Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.
gnss_NumberOfMajorCustomers
Number of major customers
Concentration Risk [Line Items]
Entity Address, Postal Zip Code
us-gaap_NetCashProvidedByUsedInOperatingActivities
Net cash used in operating activities
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description
Common Stock [Member]
us-gaap_ProductWarrantyAccrualClassifiedCurrent
Warranty reserve
us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Granted, weighted average exercise price (in dollars per share)
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
2029
us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Accumulated depreciation
Accrued Debt Exit Fee
Accrued debt exit fee.
Accrued exit fee
Customer One [Member]
Customer one.
Customer One
Entity Address, Address Line One
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Summary of Weighted Average Assumptions
Fair Value Hierarchy and NAV [Axis]
Earnings Per Share [Abstract]
Net income (loss) per common share:
Prepaid Expenses and Other [Table]
Prepaid expenses and other.
Supplemental Cash Flow Information [Abstract]
Supplemental disclosure of cash flow information
Refundable consideration, usually cash, held by the entity pending satisfactory completion of the entity's obligations or pending the closing of a contract.
Customer Deposits [Member]
Customer Deposits
Goodwill and Intangible Assets Disclosure [Text Block]
Goodwill and Intangible Assets
Operating lease right of use assets, net
Operating lease ROU assets as of September 30, 2025
Operating lease, right-of-use asset
Operating lease ROU assets as of June 30, 2026
Unrealized loss position, fair value
Long-term Securities
Unrealized loss position, fair value
Unrealized loss positions related to available-for-sale debt securities
Inventory Disclosure [Abstract]
Chief Financial Officer [Member]
Class of Warrant or Right [Axis]
Document Type
dei_DocumentType
Income Taxes Paid, Net
Income Taxes Paid, Net, Total
Cash paid for taxes
us-gaap_GrossProfit
Gross profit
Collaborative Arrangement and Arrangement Other than Collaborative [Axis]
First Amendment to Warrant Agreement [Member]
First Amendment to Warrant Agreement [Member]
First amendment to warrant agreement.
Collaborative Arrangement and Arrangement Other than Collaborative [Domain]
Entity Central Index Key
Accounts Receivable, Allowance for Credit Loss, Current
Allowance for credit losses
Tabular disclosure of changes in finite lived intangible assets.
Schedule of Changes in Finite Lived Intangible Assets
Term loan and warrant liabilities.
Term Loans And Warrant Liabilities [Abstract]
Represents effect of exchange rate for contract with customer liability.
Effect of exchange rate on deferred revenue
Effect of exchange rate on deferred revenue
Effect of exchange rate on deferred revenue
Valuation Approach and Technique [Axis]
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Net (decrease) increase in cash, cash equivalents, and restricted cash
Subsequent Event Type [Domain]
Gain on change in fair value of Warrants
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
Schedule of Revenues by Geographic Region
Antidilutive (in shares)
Amount of revenue recognized during period including amounts previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.
gnss_ContractWithCustomerLiabilityRevenueRecognizedDuringPeriod
Recognition of revenue as a result of satisfying performance obligations
us-gaap_CommonStockParOrStatedValuePerShare
Common stock, par value (in dollars per share)
Accounting Standards Update [Domain]
Amortization of operating lease right of use asset
Less amortization of operating lease ROU assets
Goodwill [Line Items]
Cost Basis
Cost Basis
Cost Basis
Schedule of Stockholders Equity [Table Text Block]
Schedule of Stockholders Equity
Customer Four [Member]
Customer four.
Customer Four
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Issuance of common stock upon exercise of stock options, net (in shares)
Issuance of common stock upon exercise of stock options, net (in shares)
Total
Accrued liabilities
gnss_ProceedsFromIssuanceOfDebtAndWarrantsGross
Proceeds from issuance of debt
Represents the gross amount received from issuance of debt and warrants.
Cost of Sales [Member]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Current Fiscal Year End Date
Schedule of Product Warranty Liability [Table Text Block]
Summary of Changes in Warranty Reserve and Extended Warranty
Long-Lived Assets by Geographic Areas [Table Text Block]
Schedule of Long Lived Assets by Geographic Region
us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Long-term restricted cash
Document Quarterly Report
Customer Relationships [Member]
Entity Address, State or Province
us-gaap_CapitalizedContractCostNetCurrent
Prepaid commissions
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Outstanding, number of shares (in shares)
Outstanding, number of shares (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Outstanding, Number
Share-based compensation arrangement by share-based payment award, remaining outstanding, number.
Share-based compensation arrangement by share-based payment award, number of shares remaining outstanding
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding, Ending Balance
Preferred Stock, Shares Outstanding, Beginning Balance
Preferred stock, shares outstanding, ending balance (in shares)
Preferred stock, shares outstanding
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive loss
Gross Unrealized Gain
Gross Unrealized Gain
Assumed exercise of dilutive options (in shares)
Assumed exercise of dilutive options
Risks and Uncertainties [Abstract]
Class of Warrant or Right [Domain]
Geographical [Axis]
Revenue recognized
Contract with Customer, Liability, Revenue Recognized
Accounts Receivable [Member]
Accounts Receivable
Short-term marketable securities
Short-term marketable securities
Short-term Securities
Raw materials
Raw materials
Puerto Rico sales tax receivable
Sales Tax Receivable
Sales tax receivable.
Obligation to issue common stock in Evertel acquisition (in shares)
Stock Issued During Period Obligation To Issue Common Stock Shares In Evertel Acquisition
Stock issued during period obligation to issue common stock shares in Evertel acquisition.
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
Summary of Stock Options Outstanding
Summary of Share-based Compensation Expense
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Percentage of Guaranteed Minimum Return
Percentage of Guaranteed Minimum Return
Guaranteed minimum return percentage
Issuance of common stock upon exercise of stock options, net
Stock Issued During Period, Value, Stock Options Exercised
Performance Shares [Member]
Subsequent Event [Member]
Subsequent Event
Property, Plant and Equipment [Abstract]
Fair Value Measurement Inputs and Valuation Techniques [Table]
Antidilutive Securities [Axis]
Gross margin.
Gross margin
EMEA [Member]
Europe, Middle East and Africa
Basis of Presentation and Significant Accounting Policies [Text Block]
Basis of Presentation and Significant Accounting Policies
us-gaap_CapitalizedContractCostAmortizationPeriod
Capitalized contract cost, amortization period
Share-Based Payment Arrangement, Option, Exercise Price Range [Table]
Value-Added Tax Receivable and Bank Withholdings
Value-added tax receivable and bank withholdings.
Spain value-added tax and bank withholdings
AOCI Attributable to Parent [Member]
Customer [Domain]
Finite-Lived Intangible Assets, Major Class Name [Domain]
us-gaap_GoodwillImpairmentLoss
Impairment of goodwill
Preferred stock, $0.00001 par value; 5,000,000 shares authorized; none issued and outstanding
Number Exercisable (in shares)
Number exercisable
Selling, general and administrative
Selling, General and Administrative Expense, Total
Debt Instrument, Maturity Date
Debt instrument, maturity date
Minimum [Member]
Minimum [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Weighted Average Grant Date Fair Value, Granted (in dollars per share)
Assets, Current [Abstract]
Current assets:
us-gaap_AmortizationOfIntangibleAssets
Amortization of Intangible Assets
Amortization
Fair Value, Inputs, Level 3 [Member]
Level 3 [Member]
Segment Reporting [Abstract]
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Schedule of Unrealized Gain (Loss) on Investments
Current liabilities:
Current liabilities:
Product [Member]
Accounting Policies [Table[
Accounting Policies [Table[
us-gaap_SharesOutstanding
Balance (in shares)
Balance (in shares)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block]
Schedule of Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value
Accounts receivable, net of allowance for credit losses of $65
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Outstanding, weighted average grant date fair value (in dollars per share)
Outstanding, weighted average grant date fair value (in dollars per share)
Work in process
Work in process
us-gaap_OperatingLeaseLiability
Present value of operating lease liabilities
Operating lease liabilities at September 30, 2025
Operating lease liabilities as of June 30, 2026
Debt Instrument, Basis Spread on Variable Rate
Debt instrument, basis spread on variable rate
Short-Term Debt
Net carrying value
Short-term debt payable
Concentration Risk Benchmark [Axis]
Long-term Securities
Long-term marketable securities
Long-term Securities
Represents information related to employees, directors, and consultants.
Employees, Directors, and Consultants [Member]
Amount of foreign currency translation gain (loss) which increases (decreases) goodwill and intangible assets.
gnss_GoodwillAndIntangibleAssetsForeignCurrencyTranslationGainLoss
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss)
Goodwill and Intangible Assets, Foreign Currency Translation Gain (Loss)
Amount of increase in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from new contract.
New performance obligations
New performance obligations
Effect of foreign exchange rate on cash
Purchases of property and equipment included in accounts payable and accrued liabilities
Capital Expenditures Incurred but Not yet Paid
Basic and diluted (in shares)
Basic (in shares)
Acquisitions
Goodwill, acquired during period
Document Information [Line Items]
Current and noncurrent accrued liabilities [text block]
Current and Noncurrent Accrued Liabilities [Text Block]
Accrued and Other Liabilities
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Share-based compensation arrangement by share-based payment award, options, exercisable, intrinsic value
Share-based compensation arrangement by share-based payment award, options, exercisable, intrinsic value
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Related to Evertel Technologies, LLC.
Evertel Technologies, LLC [Member]
Evertel [Member]
Segments [Axis]
Long-Lived Tangible Asset [Domain]
Represents term of extended product warranty.
gnss_ExtendedProductWarrantyTerm
Extended product warranty term (year)
Schedule of Short-Term Debt [Table Text Block]
Schedule of Outstanding Principal Amount and Carrying Value of Term Loan
Subsequent Events [Text Block]
Subsequent Events
Change in Fair Value of Term Loan and Warrants
Change in fair value of term loan and warrants.
Change in fair value of Term Loans and Warrants
Puerto Rico Project [Member]
Puerto Rico Contract [Member]
Puerto Rico Early Warning System
us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Share-based compensation expense
us-gaap_StockholdersEquity
Balance
Balance
Total stockholders' (deficit) equity
Preferred stock, par value (in dollars per share)
Preferred stock, par or stated value per share
Basis of Accounting, Policy [Policy Text Block]
General
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2026 (remaining three months)
Valuation Approach and Technique [Domain]
Other Liabilities Disclosure [Abstract]
Use of Estimates, Policy [Policy Text Block]
Use of Estimates
Number of options and equity instruments other than options outstanding.
gnss_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndEquityInstrumentsOtherThanOptionsOutstandingNumber
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Outstanding, Number
Share-based compensation arrangement by share-based payment award, options and equity instruments other than options, outstanding, number
Leasehold Improvements [Member]
Fair Value Disclosures [Text Block]
Fair Value Measurements
UNITED STATES
United States
gnss_DebtInstrumentBasisSpreadOnVariableRateWhenRepaymentInCash
Debt instrument, basis spread on variable rate, when repayment in cash
Percentage points added to the reference rate to compute the variable rate on the debt instrument when repayment debt in cash.
Debt and Warrants Liabilities [Text Block]
Debt and warrants liabilities.
Term Loans and Warrant Liabilities
Schedule of Accrued Liabilities [Table Text Block]
Summary of Accrued Liabilities
Debt Instrument, Name [Domain]
us-gaap_OtherAssetsCurrent
Other
Noncash investing and financing activities:
Measurement Input, Discount Rate [Member]
Debt Instrument, Periodic Payment
Debt Instrument, Periodic Payment, Total
Debt instrument, monthly payments
us-gaap_PolicyTextBlockAbstract
Accounting Policies
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]
Plan Name [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Receivable [Policy Text Block]
Accounts Receivable and Allowance for Credit Losses
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3
Transfer in
Close Date Term Loan [Member]
Close date term loan.
Close Date Term Loan [Member]
Entity Address, City or Town
The entire disclosure for prepaid expenses and other.
Prepaid Expenses And Other Disclosure [Text Block]
Prepaid Expenses and Other
First Amendment Term Loan [Member]
First amendment term loan.
First Amendment Term Loan [Member]
us-gaap_NumberOfReportableSegments
Number of reportable segments
Security Exchange Name
us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]
Prepayment of Loan
Prepayment of loan.
Loan prepayment
Property and equipment, gross
Intersegment Eliminations [Member]
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income (loss) before income taxes
(Loss) income before income taxes
Concentration Risk Type [Domain]
Gain (Loss) On Debt Issuance
Gain (loss) on debt issuance.
Loss on issuance of First Amendment Term Loan
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
Share-based compensation arrangement by share-based payment award, non-option equity instruments, granted
Represents the common stock award.
Common Stock Award [Member]
Measurement Input Type [Domain]
Antidilutive Securities, Name [Domain]
Inventories, net
Inventories, net
Cash paid for interest
Interest Paid, Excluding Capitalized Interest, Operating Activity
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table]
Statistical Measurement [Domain]
us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Class of warrant or right, exercise price of warrants or rights
us-gaap_AssetsCurrent
Total current assets
us-gaap_AllocatedShareBasedCompensationExpense
Share-based payment arrangement, expense
Share-based compensation
dei_DocumentPeriodEndDate
Document Period End Date
Title and Position [Axis]
Fair Value Hierarchy and NAV [Domain]
Notes To Financial Statements [Abstract]
Notes To Financial Statements Abstract
Exerciseable (in shares)
Number of Shares Exercisable (in shares)
Relating to vesting based on market conditions.
Vesting Based on Market Conditions [Member]
Statement of Financial Position [Abstract]
Restricted Stock Units (RSUs) [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Antidilutive Security, Excluded EPS Calculation [Table]
Vesting [Axis]
Warrants and Rights Outstanding, Maturity Date
Maturity date
us-gaap_Liabilities
Total liabilities
Dividends
us-gaap_Dividends
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
2028
us-gaap_RestrictedCash
Restricted cash
Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by range two of exercise price.
Range Two [Member]
Prepaid Expense and Other Assets, Current [Abstract]
Intangible assets, gross carrying amount
Range Six [Member]
Range Six [Member]
Accounting Policies [Line Items]
Accounting Policies [Line Items]
Weighted average shares outstanding - diluted (in shares)
Weighted average shares outstanding - diluted
Diluted (in shares)
dei_EntityFileNumber
Entity File Number
Unrealized (loss) gain on marketable securities
Unrealized gain on marketable securities
Accounting Standards Update 2023-07 [Member]
ASU No. 2023-07
Measurement Input Type [Axis]
Business Combination Fair Value Measurement Of Acquired Intangible Assets [Table Text Block]
Business combination fair value measurement of acquired intangible assets.
Schedule of Business Combination, Fair Value Measurement of Acquired Intangible Assets
Prepaid expenses and other
Prepaid Expense and Other Assets, Current
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Forfeited/cancelled, number of shares (in shares)
Number of shares cancelled
Income tax liability
Taxes Payable, Current
Taxes Payable, Current, Total
Revenue Benchmark [Member]
Revenue Benchmark
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]
Schedule of Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Share-based compensation arrangement by share-based payment award, number of shares authorized
Segment Reporting Disclosure [Text Block]
Segment Information
Revenues
Revenues
Total Revenues
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Number of Shares Forfeited/expired (in shares)
Subsequent Event [Table]
us-gaap_FiniteLivedIntangibleAssetsNet
Finite-Lived Intangible Assets, Net
Balance as of September 30, 2025
Balance as of June 30, 2026
us-gaap_OperatingLeaseExpense
Total lease expense under operating leases
Debt Instrument, Interest Rate, Increase (Decrease)
Debt instrument, additional interest rate
Debt instrument, increased interest rate
New Accounting Pronouncements, Policy [Policy Text Block]
Recently Adopted Pronouncements and Accounting Pronouncements not yet Adopted
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Summary of Maturities of Operating Lease Liabilities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Current portion as of March 31, 2023
Deferred revenue
Current portion as of June 30, 2026
Increase (Decrease) in Contract with Customer, Asset
Contract assets
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed
Total return as percentage of principal amount repaid
us-gaap_Depreciation
Depreciation and amortization expense
Second Amendment Term Loan [Member]
Second Amendment Term Loan.
Second Amendment Term Loan [Member]
Proceeds from Issuance of Long-Term Debt
Proceeds from Issuance of Long-Term Debt, Total
Proceeds from issuance of First Amendment Term Loan
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount
Represents the number of additional inactive subsidiaries of the reporting entity, as of a certain date.
gnss_NumberOfAdditionalInactiveSubsidiaries
Number of additional inactive subsidiaries
Common stock, shares, outstanding (in shares)
Term Loan [Member]
Represents term loan.
Loss on change in fair value of Term Loan
Fair value adjustment of debt.
Loss on change in fair value of Term Loans
Operating lease liabilities, current portion
Current portion as of June 30, 2026
us-gaap_DepreciationDepletionAndAmortization
Depreciation and amortization
Depreciation, Depletion and Amortization, Total
Depreciation and amortization expense
us-gaap_RevenueRemainingPerformanceObligation
Revenue, Remaining Performance Obligation, Amount
dei_DocumentTransitionReport
Document Transition Report
us-gaap_OperatingExpenses
Total operating expenses
Research and development
Research and Development Expense, Total
Cost of revenues
Cost of Revenue, Total
Lessee, Operating Leases [Text Block]
Leases
Valuation Technique, Discounted Cash Flow [Member]
Statement of Cash Flows [Abstract]
Prepaid Expenses and Other [Line Items]
Prepaid expenses and other.
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Summary of Stock Option Activity
Percentage of Extension Fee
Percentage of extension fee.
Percentage of extension fee
us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Cash paid for acquisitions net of cash acquired
Equity [Text Block]
Stockholders' Equity
Earnings Per Share [Text Block]
Net Loss Per Share
Net loss
Net (loss) income
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value
Share-based compensation arrangement by share-based payment award, options, outstanding, intrinsic value
Inventory obsolescence
us-gaap_IncreaseDecreaseInInventories
Inventories, net
Canadian goods and services and harmonized sales tax receivable
Dividend yield (Rate)
Intangible assets, net
Operating Lease, Payments
Less lease principal payments on operating lease liabilities
ASSETS
Stock Issued During Period Obligation To Issue Common Stock value In Evertel Acquisition
Stock issued during period obligation to issue common stock value in Evertel acquisition.
Obligation to issue common stock in Evertel acquisition
Risk-free interest rate (Rate)
Construction in Progress [Member]
Document Fiscal Year Focus
Asia Pacific [Member]
Asia Pacific
Exercise Price Range [Domain]
us-gaap_DebtInstrumentMeasurementInput
Debt instrument, measurement input
Concentration Risk Benchmark [Domain]
us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Investing Activities:
Upper Exercise Price (in dollars per share)
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit
Upper exercise price
Accounts payable
Interest Expense, Nonoperating
Interest Expense, Nonoperating, Total
Interest expense
Research and Development Expense [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases
Payment
Customer three.
Customer Three [Member]
Customer Three
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]
Schedule of Contract Asset and Contract Liabilities
Summary of Prepaid Expenses and Other Current Assets
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
2027
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Proceeds from exercise of stock options
Fair Value Disclosures [Abstract]
Commitments and Contingencies Disclosure [Abstract]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
2027
Short Term Provision
Short term provision.
Short-term provision
Non-Rule 10b5-1 Arr Modified [Flag]
Non-Rule 10b5-1 Arr Modified [Flag]
Contract with Customer, Asset, after Allowance for Credit Loss, Current
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total
Contract assets
Debt Instrument [Axis]
Share-Based Payment Arrangement [Abstract]
Fair Value
Fair Value
Third Amendment Term Loan [Member]
Third Amendment Term Loan.
Third Amendment Term Loan [Member]
us-gaap_ConcentrationRiskPercentage1
Concentration risk percentage
Performance-Based Restricted Stock Units [Member]
Performance-Based Restricted Stock Units [Member]
Performance-based restricted stock units.
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Summary of Company's RSU Activity
us-gaap_NetCashProvidedByUsedInInvestingActivities
Net cash provided by investing activities
Represents accrued contract costs.
gnss_AccruedContractCosts
Accrued contract costs
Title of 12(b) Security
Schedule of Segment Reporting Information, by Segment [Table]
Forfeited/cancelled, weighted average grant date fair value (in dollars per share)
Income Tax Disclosure [Text Block]
Income Taxes
Weighted average shares outstanding - basic (in shares)
Patents [Member]
Represents the options and RSUs.
Options and RSUs [Member]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
2026 (remaining three months)
Document Information [Table]
Consolidated Entities [Axis]
Changes in operating assets and liabilities:
Property, Plant and Equipment [Table Text Block]
Schedule of Property and Equipment, Net
Tabular disclosure of initial measurement of operating lease.
Initial Measurement of Operating Lease [Table Text Block]
Summary of Operating ROU Assets and Liabilities
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Outstanding, weighted average exercise price (in dollars per share)
Outstanding, weighted average exercise price (in dollars per share)
Income Tax Disclosure [Abstract]
Fair Value, Recurring and Nonrecurring [Table]
Unrecognized Tax Benefits
Unrecognized Tax Benefits, Ending Balance
Unrecognized Tax Benefits, Beginning Balance
Unrecognized tax benefits
Additional Paid-in Capital [Member]
Equity Plan 2025 [Member]
Represents The 2025 Equity Incentive Plan ("2025" Equity Plan").
2025 Equity Plan [Member]
Measurement Frequency [Domain]
Statement of Income Location, Balance [Axis]
Change in Accounting Principle, Accounting Standards Update, Adoption Date
Trading Symbol
Property, Plant and Equipment Disclosure [Text Block]
Property and Equipment, Net
Subsequent Event Type [Axis]
Schedule of Finite-Lived Intangible Assets
us-gaap_EmployeeRelatedLiabilitiesCurrent
Payroll and related
Financing Activities:
Expected term in years (Year)
Fair Value, Recurring [Member]
Fair Value, Recurring [Member]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total undiscounted operating lease payments
Range Five [Member]
Range Five [Member]
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less imputed interest
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Goodwill and Intangible Asset Impairment
Goodwill and intangible asset impairments
Equity Components [Axis]
Nonoperating Income (Expense)
Other (expense) income, net
Equity Component [Domain]
Asset Class [Axis]
Goodwill and Intangible Assets Disclosure [Abstract]
Deferred Revenue, Noncurrent
Deferred Revenue, Noncurrent, Total
Deferred revenue, noncurrent
us-gaap_ProductWarrantyAccrual
Ending balance
Beginning balance
Business Combination [Axis]
Prepaid insurance
us-gaap_PrepaidInsurance
us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Issuance of common stock upon vesting of restricted stock units (in shares)
Machinery and Equipment [Member]
Customer [Axis]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Notes Payable, Noncurrent
Notes Payable, Noncurrent, Total
Notes payable, at fair value - long-term
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period
Share-based compensation arrangement by share-based payment award, expiration period
Represents The 2015 Equity Incentive Plan ("2015" Equity Plan").
2015 Equity Plan [Member]
Depreciation and amortization
Statement of Comprehensive Income [Abstract]
Maximum [Member]
Debt Instrument, Increase (Decrease), Net
Debt Instrument, Increase (Decrease), Net, Total
Outstanding principal balance
Increase in outstanding principal amount
Statistical Measurement [Axis]
Exercised, weighted average exercise price (in dollars per share)
Weighted Average Exercise Price, Exercised (in dollars per share)
Deferred revenue
us-gaap_ContractWithCustomerLiabilityNoncurrent
Less: non-current portion
us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Accumulated amortization
Warranty provision
Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to new warranties issuance and preexisting product warranties.
gnss_ProductWarrantyAccrualIncreaseDecreaseForNewWarrantiesIssuanceAndAdjustmentPreexistingWarranties
gnss_DebtInstrumentBasisSpreadOnVariableRateWhenRepaymentInCashAndIssuanceOfShares
Debt instrument, basis spread on variable rate, when repayment in cash and issuance of shares
Percentage points added to the reference rate to compute the variable rate on the debt instrument when repayment of debt in cash and issuance of stocks.
Common stock, $0.00001 par value; 100,000,000 shares authorized; 45,482,009 and 45,161,172 shares issued and outstanding as of March 31, 2026 and September 30, 2025, respectivel
Common stock, $0.00001 par value; 100,000,000 shares authorized; 45,542,009 and 45,161,172 shares issued and outstanding as of June 30, 2026 and September 30, 2025, respectively
Consolidation, Policy [Policy Text Block]
Principles Of Consolidation
Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).
gnss_FinitelivedIntangibleAssetExpectedAmortizationAfterYearFour
Thereafter
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Term Loan and Warrant Liabilities [Line Items]
Term loan and warrant liabilities.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
Other Nonoperating Income (Expense) [Abstract]
Other (expenses):
gnss_DebtInstrumentOriginalIssueDiscountPercentage
Debt instrument, original issue discount percentage
Percentage of original issue discount under debt instrument.
Volatility (Rate)
Preferred stock, shares authorized (in shares)
Preferred stock, shares authorized
Finite-Lived Intangible Assets by Major Class [Axis]
Payment, Tax Withholding, Share-Based Payment Arrangement
Shares retained for payment of taxes in connection with settlement of restricted stock units
Revenue from Contract with Customer [Text Block]
Revenue Recognition
Lower Exercise Price (in dollars per share)
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit
Lower exercise price
dei_EntityRegistrantName
Entity Registrant Name
us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Gross Unrealized Loss
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax
Customer Concentration Risk [Member]
Customer Concentration Risk
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2028
Other income, net
Other (expense) income, net
Other
Additional paid-in capital
Exercisable, Weighted Average Exercise Price (in dollars per share)
Exercisable, weighted average exercise price
Repayment of Debt Exit Fee
Repayment of Debt Exit Fee
Exit fee upon repayment
Exit fee
Subsequent Events [Abstract]
Represents amount of asset related to consideration paid in advance for deposits for inventory that provides economic benefits.
gnss_DepositsForInventory
Deposits for inventory
Consolidated Entities [Domain]
us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2029
Income Tax Expense (Benefit), Total
Income tax benefit
Income tax expense (benefit)
Income tax expense
Measurement Frequency [Axis]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Summary of Fair Value Assumptions Applied in Determining Initial Fair Value and Subsequent Fair Value of Warrant Liabilities
dei_EntityCommonStockSharesOutstanding
Entity Common Stock, Shares Outstanding (in shares)
US States and Political Subdivisions Debt Securities [Member]
Municipal Securities [Member]
Liability Class [Axis]
Accumulated other comprehensive income (loss)
Accumulated other comprehensive income
Consolidation Items [Axis]
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Capital expenditures
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Number of Shares Granted (in shares)
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period
us-gaap_Assets
Assets
Total assets
Total assets
Property, Plant and Equipment [Table]
Income Statement [Abstract]
Amount of asset related to consideration paid in advance for due and subscription that provides economic benefits within a future period of one year or the normal operating cycle, if longer.
gnss_DueAndSubscription
Dues and subscriptions
Selling, General and Administrative Expenses [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Vested, number of shares (in shares)
Basic and diluted loss per share (in dollars per share)
Earnings Per Share, Diluted, Total
Diluted loss per share
Net loss per common share - diluted (in dollars per share)
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Segment Reporting Information by Segment
Operating Segments [Member]
Title and Position [Domain]
dei_CityAreaCode
City Area Code
Other Comprehensive Income (Loss), Net of Tax
Other Comprehensive Income (Loss), Net of Tax, Total
Accumulated other comprehensive income (loss)
Other comprehensive income (loss)
Share-based compensation arrangement by share-based payment award, expiration date
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Date
us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Restricted cash, current portion
Debt Instrument, Fee Amount
Debt instrument, origination fee
Debt instrument, face amount
Debt Instrument, Face Amount
Principal
Schedule of Revenue by Major Customers, by Reporting Segments [Table]
us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Operating lease, weighted-average remaining lease term
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Change in fair value in net loss
Term Loan and Warrant Liabilities [Table]
Term loan and warrant liabilities.
Segment Reporting Information [Line Items]
Range Seven [Member]
Range Seven [Member]
Amount of cash outflow to satisfy grantee's tax in connections with exercise of stock options withholding obligation for award under share-based payment arrangement.
Shares retained for payment of taxes in connection with the exercise of stock options
Shares retained for payment of taxes in connection with exercise of stock options
Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.
Deferred Revenue [Member]
Deferred Revenue
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash, Cash Equivalents and Restricted Cash
Property and equipment, net
Property and equipment, net
us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Issuance of common stock upon vesting of restricted stock units
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash, cash equivalents and restricted cash, end of period
Cash, cash equivalents and restricted cash, beginning of period
Total cash, cash equivalents and restricted cash shown in the consolidated balance sheets
us-gaap_OperatingIncomeLoss
Loss from operations
(Loss) income from operations
us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Currency translation
Operating lease right of use asset gain (loss)
Operating Lease Right Of Use Asset Gain (Loss)
Operating lease right of use asset gain (loss)
Retained Earnings [Member]
Stock-based compensation
Share-based compensation
Measurement Input, Price Volatility [Member]
Accrued and Other Liabilities [Line items]
Accrued and Other Liabilities.
Debt Instrument Maximum Additional Term Loans Amount
Debt instrument maximum additional term loan amount.
Debt instrument maximum additional term loan amount
us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Operating lease, weighted-average incremental borrowing rate
Operating lease liabilities, noncurrent
Less non-current portion
Fair Value, Inputs, Level 1 [Member]
Level 1 [Member]
Class of Stock [Line Items]
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by financing activities
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]
Unamortized Debt Issuance Expense
Unamortized debt issuance cost
Developed Technology Rights [Member]
Technology [Member]
The amount of increase in additional paid-in capital from the obligation to issue common stock.
gnss_IncreaseInAdditionalPaidinCapitalObligationToIssueCommonStock
Obligation to issue common stock in Evertel acquisition
Increase in additional paid-in capital, obligation to issue common stock
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Summary of Changes in Fair Value of Warrant Liabilities Level 3
Nonoperating Income (Expense) [Abstract]
Other (expense) income
Warrant liability
Goodwill [Table]
Currency translation
gnss_DebtInstrumentRedemptionOfDebtPercentageOfPrincipalAmount
Debt instrument, redemption of debt percentage of principal amount
Amount of redemption of debt within one year as percentage of principal amount of the debt.
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax and Reclassification Adjustment, Attributable to Parent
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax and Reclassification Adjustment, Attributable to Parent, Total
Change in fair value of Term Loans related to credit risk
Change in fair value related to credit risk in other comprehensive income
Non-US [Member]
Americas (excluding the United States)
The noncash amount of unrealized gain (loss) on investment in marketable security.
Change in unrealized loss on marketable securities
Change in unrealized loss on marketable securities
dei_EntityInteractiveDataCurrent
Entity Interactive Data Current
Statement of Income Location, Balance [Domain]
Operating Activities:
Office Furniture and Equipment [Member]
gnss_DebtInstrumentRepaymentOfInterestPercentageInCash
Debt instrument, repayment of interest, percentage in cash
Amount of repayment of debt interest in cash as percentage.
Accounting Standards Update and Change in Accounting Principle [Text Block]
Recent Accounting Pronouncements
Accretion (Amortization) of Discounts and Premiums, Investments
Accretion of investment of marketable securities
us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Obligation to issue common stock in Evertel acquisition (in shares}
Business acquisition, equity interest issued or issuable, number of shares (in shares)
us-gaap_ContractWithCustomerAssetNet
Contract with customer, asset, after allowance for credit loss, total
Contract with Customer, Asset, after Allowance for Credit Loss, Total
Contract with Customer, Asset, after Allowance for Credit Loss, Total
Change in fair value in net loss
Change in fair value related to non-credit risk in net loss
Change in fair value related to non-credit risk recorded within net loss
us-gaap_CommonStockDividendsPerShareDeclared
Common stock, dividends, per share, declared (in dollars per share)
Represents Genasys Spain.
Genasys Spain [Member]
Entity Tax Identification Number
Revenues:
Share price
us-gaap_SharePrice
dei_LocalPhoneNumber
Local Phone Number
Management [Member]
Number Outstanding (in shares)
Number outstanding
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
Share-based payment arrangement, nonvested award, option, cost not yet recognized, amount
us-gaap_ShortTermLeaseCost
Short-term lease expense
Weighted average common shares outstanding:
us-gaap_RevenueRemainingPerformanceObligationPercentage
Revenue, Remaining Performance Obligation, Percentage
Long-lived assets
Long-lived assets
Total long lived assets
Accounting Policies [Abstract]
Disaggregation of Revenue [Line Items]
Lessee, Operating Lease, Liability, to be Paid, Year Four
2030
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Share-based compensation arrangement by share-based payment award, number of shares available for grant
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition
Stock, Class of Stock [Table]
Entity Emerging Growth Company