0001432133-25-000051 | 10-Q | XBRL Viewer

SELECTED STATEMENT OF OPERATIONS DATA (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Financial income:
Financial income	$ 2,468	$ 818
Financial expenses:
Bank fees	39	33
Financial expenses	$ 665	$ 2,315

Label	Element	Value
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	$ 8,000
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	10,000
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	0
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	1,000
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	19,000
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	16,000
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	20,000
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	0
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	1,000
Available-for-sale - maturities within one year, Gross unrealized gains	kltr_AvailableForSaleMaturitiesWithinOneYearGrossUnrealizedGains	37,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	5,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	1,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	1,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	1,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	8,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	9,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	1,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	4,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	2,000
Available-for-sale - matures within one year, Gross unrealized losses	kltr_AvailableForSaleMaturesWithinOneYearGrossUnrealizedLosses	16,000
Cash settlement of equity classified share-based payment awards	kltr_CashSettlementOfEquityClassifiedShareBasedPaymentAwards	889,000
Cash settlement of equity classified share-based payment awards	kltr_CashSettlementOfEquityClassifiedShareBasedPaymentAwards	0
Increase (Decrease) In Operating Lease Rou Assets And Liabilities Net	kltr_IncreaseDecreaseInOperatingLeaseRouAssetsAndLiabilitiesNet	(228,000)
Increase (Decrease) In Operating Lease Rou Assets And Liabilities Net	kltr_IncreaseDecreaseInOperatingLeaseRouAssetsAndLiabilitiesNet	(358,000)
Additions To Deferred Costs To Fulfill Contract During Period	kltr_AdditionsToDeferredCostsToFulfillContractDuringPeriod	0
Additions To Deferred Costs To Fulfill Contract During Period	kltr_AdditionsToDeferredCostsToFulfillContractDuringPeriod	0
Available-for-sale - matures after one year, Gross unrealized gains	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains	13,000
Available-for-sale - matures after one year, Gross unrealized gains	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains	11,000
Available-for-sale - matures after one year, Gross unrealized gains	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains	0
Available-for-sale - matures after one year, Gross unrealized gains	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains	24,000
Available-for-sale - matures after one year, Gross unrealized gains	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains	0
Available-for-sale - matures after one year, Gross unrealized gains	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains	2,000
Available-for-sale - matures after one year, Gross unrealized gains	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedGains	2,000
Available-for-sale - matures after one year, Gross unrealized losses	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses	0
Available-for-sale - matures after one year, Gross unrealized losses	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses	0
Available-for-sale - matures after one year, Gross unrealized losses	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses	0
Available-for-sale - matures after one year, Gross unrealized losses	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses	0
Available-for-sale - matures after one year, Gross unrealized losses	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses	0
Available-for-sale - matures after one year, Gross unrealized losses	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses	0
Available-for-sale - matures after one year, Gross unrealized losses	kltr_AvailableForSaleMaturesAfterOneYearGrossUnrealizedLosses	0
Additions To Deferred Contract Acquisition Costs During Period	kltr_AdditionsToDeferredContractAcquisitionCostsDuringPeriod	1,104,000
Additions To Deferred Contract Acquisition Costs During Period	kltr_AdditionsToDeferredContractAcquisitionCostsDuringPeriod	1,170,000
Severance Pay Fund	kltr_SeverancePayFund	1,770,000
Severance Pay Fund	kltr_SeverancePayFund	1,577,000
Pending proceeds from option exercises	kltr_PendingProceedsFromOptionExercises	13,000
Pending proceeds from option exercises	kltr_PendingProceedsFromOptionExercises	47,000
Cash settlement of equity classified share-based payment awards, unpaid	kltr_CashSettlementOfEquityClassifiedShareBasedPaymentAwardsUnpaid	2,200,000
Cash settlement of equity classified share-based payment awards, unpaid	kltr_CashSettlementOfEquityClassifiedShareBasedPaymentAwardsUnpaid	$ 0
NoInsiderTradingFlag	kltr_NoInsiderTradingFlag	true
Increase In Deferred Contract Acquisition And Fulfillment Costs	kltr_IncreaseInDeferredContractAcquisitionAndFulfillmentCosts	$ 1,104,000
Increase In Deferred Contract Acquisition And Fulfillment Costs	kltr_IncreaseInDeferredContractAcquisitionAndFulfillmentCosts	1,067,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Cash Settlement in the Period	kltr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCashSettlementInThePeriod	1,661,000
Non Cash Interest Expenses	kltr_NonCashInterestExpenses	(60,000)
Non Cash Interest Expenses	kltr_NonCashInterestExpenses	$ (286,000)

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