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NRC License for the De-conversion Facility [Member] Represents the NRC license for the de-conversion facility. inis_LicenseTerm License Term (Year) Period of the license. Forfeited, weighted average exercise price (in dollars per share) Granted, weighted average exercise price (in dollars per share) Salaries and contract labor us-gaap_CommonStockOtherSharesOutstanding Common Stock, Other Shares, Outstanding us-gaap_DividendsPreferredStockCash Dividends, Preferred Stock, Cash us-gaap_DividendsPreferredStockStock Dividends, Preferred Stock, Stock us-gaap_LesseeOperatingLeaseDiscountRate Lessee, Operating Lease, Discount Rate Asset Pledged as Collateral [Member] Weighted Average [Member] us-gaap_IncreaseDecreaseInInventories Inventories us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Segment Reporting [Text Block] Award Type [Axis] inis_ContractTerm Contract Term (Year) Term of the contract. Segment Reporting [Table Text Block] Adjustments to reconcile net loss to net cash provided by operating activities Three Customers [Member] Represents three customers. Plan Name [Axis] us-gaap_Liabilities Total liabilities Plan Name [Domain] Contract With the DOE for the Irradiation of Cobalt Targets [Member] Represents contract with the DOE for the irradiation of cobalt targets. inis_NumberOfMajorCustomers Number of Major Customers The number of major customers. us-gaap_AllocatedShareBasedCompensationExpense Share-Based Payment Arrangement, Expense Consolidation Items [Axis] us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders' equity Theranostics Products [Member] Represents Theranostics Products. 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financing leases Weighted-average discount rate - operating leases Calibration & Reference Products [Member] Represents the Calibration & Reference Products. 2027, operating leases Forfeited (in shares) Expired (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) inis_DebtInstrumentClosingCashReimbursement Debt Instrument, Closing Cash Reimbursement The amount paid for closing cash reimbursement. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) Second Promissory Agreement With AMICI [Member] Represents the second promissory note entered with AMICI. 2026 (excluding the three-months ended March 31, 2026), operating leases Exercisable (in shares) Exercisable, weighted average exercise price (in dollars per share) 2029, operating leases us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber Stock options (in shares) Outstanding (in shares) Outstanding (in shares) Commitments and Contingencies Disclosure [Text Block] 2028, operating leases us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice Outstanding, weighted average exercise price (in dollars per share) Outstanding, weighted average exercise price (in dollars per share) Statement [Line Items] 2030, operating leases Outstanding, aggregate intrinsic value Common stock, issued (in shares) Common stock, outstanding (in shares) Award Type [Domain] us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Common stock, authorized (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate us-gaap_DividendsPayableCurrentAndNoncurrent Dividends Payable Conversion of AMICI Debt Note Into Common Stock [Member] Represents the conversion of the AMICI debt note into common stock. Common stock, $0.01 par value; 750,000,000 shares authorized; 528,968,316 and 528,209,538 shares issued and outstanding, respectively Schedule of Weighted Average Number of Shares [Table Text Block] Amortization of right-of-use assets us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) us-gaap_InterestPayableCurrentAndNoncurrent Interest Payable Accounts payable Present value of minimum finance lease obligations us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_TableTextBlock Notes Tables Discontinued Operations, Held-for-Sale or Disposed of by Sale [Member] Finance lease obligations, net of current maturities us-gaap_FinanceLeaseLiabilityNoncurrent us-gaap_FinanceLeaseLiabilityPaymentsDue Total minimum finance lease obligations Disposal Group Classification [Axis] us-gaap_FinanceLeaseLiabilityCurrent Current finance lease maturities Disposal Group Classification [Domain] us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount Less-amounts representing interest 2029, finance lease 2028, finance lease Subsequent Events [Text Block] 2030, finance lease Expenditures for segment assets Concentration Risk Type [Axis] Accrued liabilities 2027, finance lease Interest on lease liabilities Nonrelated Party [Member] Related Party [Member] Proceeds from the issuance of notes payable 2026 (excluding the three-months ended March 31, 2026), finance lease us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less-amounts representing interest Operating lease obligations, net of current maturities Operating lease right-of-use liability, net of current portion Outstanding, weighted average remaining contractual life (Year) Present value of minimum operating lease obligations us-gaap_ProceedsFromRelatedPartyDebt Proceeds from Related Party Debt Current portion of operating lease right-of-use liability Current operating lease maturities Current portion of notes payable us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1 Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year) Exercisable, weighted average remaining contractual life (Year) Concentration Risk Type [Domain] Capitalization, Equity [Table] Statement of Stockholders' Equity [Abstract] Loss Contingency Nature [Axis] Class of Warrant or Right [Axis] Class of Warrant or Right [Domain] Statement of Cash Flows [Abstract] us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion Shares of Series C Preferred Stock (in shares) us-gaap_LossContingencyEstimateOfPossibleLoss Loss Contingency, Estimate of Possible Loss Equity Components [Axis] Equity Component [Domain] Equity [Text Block] us-gaap_ClassOfWarrantOrRightOutstanding Class of Warrant or Right, Outstanding (in shares) Additional Paid-in Capital [Member] Retained Earnings [Member] Cost of product Loss Contingency, Nature [Domain] Asset Acquisition [Table] Property, plant and equipment, net Bad Debt Expense Subsequent Event [Table] Stockholders' equity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Shortage of Raw Materials [Member] Shortage of Raw Materials Share-Based Payment Arrangement, Option, Activity [Table Text Block] Substantial Doubt about Going Concern [Text Block] Share-Based Payment Arrangement, Option [Member] Supplemental disclosure of cash flow activities: Current liabilities us-gaap_LiabilitiesCurrent Total current liabilities Proceeds from sale of stock and exercise of options and warrants Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Customer Concentration Risk [Member] Lease, Cost [Table Text Block] Other Commitments [Table] us-gaap_PreferredStockConvertibleConversionPrice Preferred Stock, Convertible, Conversion Price (in dollars per share) General, administrative, and consulting Additional paid in capital Debt Disclosure [Text Block] Debt Conversion, Name [Domain] Debt Conversion Description [Axis] Prepaids and other current assets us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) Shares issued for issuance of RSUs Shares issued under employee stock purchase plan us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchase of property, plant and equipment us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature Debt Instrument, Convertible, Beneficial Conversion Feature Stock based compensation us-gaap_DebtInstrumentCarryingAmount Long-Term Debt, Gross us-gaap_MoneyMarketFundsAtCarryingValue Cash Equivalent, Money Market Fund, Carrying Value Stock for Amici us-gaap_DebtInstrumentFaceAmount Debt Instrument, Face Amount Stock in lieu of dividends on convertible preferred C Current assets Asset Acquisition [Text Block] us-gaap_AssetsCurrent Total current assets Stock based compensation (in shares) Shares issued under employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) us-gaap_GrossProfit Gross profit Restricted Stock Units (RSUs) [Member] Stock for Amici (in shares) Debt Instrument, Name [Domain] Exercised (in shares) us-gaap_DebtInstrumentInterestRateStatedPercentage Debt Instrument, Interest Rate, Stated Percentage Shares issued for issuance of RSUs (in shares) Class of Stock [Domain] Capitalized lease disposal costs, net Represents the amount of capitalized lease disposal costs, net. Related and Nonrelated Parties [Axis] us-gaap_DebtInstrumentPeriodicPayment Debt Instrument, Periodic Payment Schedule of Long-Term Debt Instruments [Table] Debt Instrument [Axis] Series C Preferred Stock (in shares) us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock Cash flows from operating activities Cash flows from investing activities: us-gaap_NetCashProvidedByUsedInOperatingActivities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net cash used in operating activities Cash flows from financing activities: us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash used in investing activities us-gaap_SharesIssuedPricePerShare Shares Issued, Price Per Share (in dollars per share) us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash used in financing activities Operating Segments [Member] Accounting Policies [Abstract] Segments [Domain] Major Shareholders [Member] Represents the major shareholders member. us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent Accounts Receivable, Allowance for Credit Loss, Current Segments [Axis] Income Statement [Abstract] us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Net loss Net Income (Loss) Attributable to Parent Net loss us-gaap_DebtConversionOriginalDebtAmount1 Debt Conversion, Original Debt, Amount Accretion of obligation for lease disposal costs Represents the amount of accretion of obligation for lease disposal costs. Mandatorily redeemable convertible preferred stock Cobalt Products [Member] Relating to Cobalt products. The 2015 Incentive Plan [Member] Relating to the 2015 Incentive Plan. Employee Stock Purchase Plan [Member] Relating to the Employee Stock Purchase Plan. inis_RightofuseAssetAmortization Right-of-use asset changes, net Represents the amortization of right-of-use assets during the period. us-gaap_ProceedsFromStockPlans Proceeds from Stock Plans Accounting Standards Update and Change in Accounting Principle [Table] Supplemental disclosure of noncash financing and investing transactions The 2019 Promissory Note [Member] Relating to the 2019 Promissory Note. Related and Nonrelated Parties [Domain] The 2018 Promissory Note [Member] Relating to the 2018 promissory note. The 2013 Promissory Note [Member] Relating to the 2013 Promissory Note. Asset retirement obligation Class O Warrants [Member] Relating to class O warrants. Chief Executive Officer and Chairman of the Board [Member] Relating to the Chief Executive Officer and the Chairman of the Board. Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Fluorine Products [Member] Relating to Fluorine Products. inis_OtherCommitmentsAnnualFixedPriceEscalationPercent Other Commitments, Annual Fixed Price, Escalation Percent Represents the escalation percent of an annual fixed price as part of an other commitment. Thereafter, operating leases Amount of lessee's undiscounted obligation for lease payment for operating lease due 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). Lessee, Liability, to be Paid, Maturity [ Table Text Block] Tabular disclosure of undiscounted cash flows of lessee's lease liabilities. Includes, but is not limited to, reconciliation of undiscounted cash flows to lease liabilities recognized in statement of financial position. Vesting [Axis] Other income (expense): Statement of Financial Position [Abstract] Vesting [Domain] Thereafter, finance lease Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid 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). Promissory Agreement With AMICI [Member] Pertains to the promissory agreement. inis_FinanceLeaseExpense Total financing lease expense Represents the amount of finance lease expense during the period. us-gaap_NonoperatingIncomeExpense Total other expense us-gaap_LiabilitiesNoncurrent Total long-term liabilities us-gaap_AssetsNoncurrent Total long-term assets Long-term assets Cash paid for income taxes us-gaap_RepaymentsOfNotesPayable Principal payments on notes payable Long-term liabilities Unearned revenues us-gaap_IncreaseDecreaseInDeferredRevenue us-gaap_WarrantsAndRightsOutstanding Warrants and Rights Outstanding Document Type Operating costs and expenses: Document Information [Line Items] Document Quarterly Report us-gaap_ConcentrationRiskPercentage1 Concentration Risk, Percentage us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract (Year) us-gaap_LesseeOperatingLeaseRenewalTerm Lessee, Operating Lease, Renewal Term (Year) Weighted-average remaining lease term (years) - operating leases (Year) Document Information [Table] us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) Antidilutive Securities [Axis] Entity Interactive Data Current Document Transition Report Weighted average common shares outstanding - diluted (in shares) Weighted average common shares outstanding - diluted (in shares) us-gaap_OperatingExpenses Total operating expenses inis_LesseeOperatingLeaseRateChange Lessee, Operating Lease, Rate Change Represents the yearly rate change. Stock Options (in shares) us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements Weighted average common shares outstanding - basic (in shares) Weighted average common shares outstanding - basic (in shares) Antidilutive Security, Excluded EPS Calculation [Table] Net loss per common share - basic: (in dollars per share) Stock issued Lease Agreement for Second Facility [Member] Relates to the lease agreement. Related party notes payable Title and Position [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Patents and other intangibles, net Document Fiscal Period Focus Customer [Domain] Pledging Purpose [Axis] Document Fiscal Year Focus Pledging Purpose [Domain] Amendment Flag Common Stock [Member] Goodwill Document Period End Date us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) Legal Entity [Axis] Operating lease costs Short-term operating lease costs us-gaap_LeaseCost Total lease expense Entity File Number Entity Tax Identification Number Disaggregation of Revenue [Table] Entity [Domain] Entity Central Index Key Entity Registrant Name Entity Current Reporting Status Entity Incorporation, State or Country Code Current Fiscal Year End Date Share-Based Payment Arrangement, Tranche Four [Member] Relating to the fourth vesting tranche. Share-Based Payment Arrangement, Tranche Five [Member] Relating to the fifth vesting tranche. inis_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsStockPriceTrigger Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Stock Price Trigger (in dollars per share) Represents the stock price trigger for vesting on share based compensation arrangements. Research and development Entity Filer Category Entity Shell Company Entity Emerging Growth Company Entity Small Business us-gaap_OperatingIncomeLoss Net operating loss Our of Period Adjustment [Member] Relating to an out of period adjustment. Stock in lieu of dividends on convertible preferred C (in shares) Stock Dividends, Shares (in shares) Entity Address, State or Province Entity Address, City or Town us-gaap_InterestExpenseNonoperating Interest expense Accumulated deficit Entity Address, Address Line One City Area Code Local Phone Number Entity Address, Postal Zip Code Revenue from Contract with Customer [Text Block] Class of Stock [Axis] Entity Common Stock, Shares Outstanding Earnings Per Share [Text Block] Chief Executive Officer [Member] Scenario [Axis] Scenario [Domain] Forecast [Member] Lessee, Operating Leases and Finance Leases [Text Block] Disclosure of the operating leases and finance leases that the entity is a lessee in. Exercisable, aggregate intrinsic value Common stock, par value (in dollars per share) Error Correction, Type [Domain] Other income Segment assets us-gaap_Assets Total assets Cash and cash equivalents us-gaap_CommonStockCapitalSharesReservedForFutureIssuance Common Stock, Capital Shares Reserved for Future Issuance (in shares) Net loss per common share - diluted: (in dollars per share) Customer [Axis] Unearned revenue Contract with Customer, Liability, Current Depreciation and amortization Depreciation and amortization Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Disposal Group Name [Domain] Interest income Cash paid for interest Inventories Disposal Group Name [Axis] us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration Disposal Group, Including Discontinued Operation, Consideration Schedule of Stock by Class [Table Text Block] us-gaap_StockholdersEquity Total equity Balance Balance Stock, Class of Stock [Table] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Operating lease right-of-use asset ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] Sale of product ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag]