Document And Entity Information
Statistical Measurement [Axis]
Note To Financial Statement Details Textual
Significant Accounting Policies
Note 3 - Acquisition of Amorphous Materials
Income tax provision
Income tax provision
ecd_NonRule10b51ArrTrmntdFlag
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Note 6 - Revenue
ecd_NonRule10b51ArrAdoptedFlag
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Note 7 - Inventories
Trading Arrangements, by Individual [Table]
Note 8 - Property and Equipment
Material Terms of Trading Arrangement [Text Block]
Note 9 - Goodwill and Intangible Assets
Note 10 - Income Taxes
Note 11 - Stock-based Compensation
Note 12 - Earnings (Loss) Per Share
Note 13 - Leases
Minimum [Member]
Note 14 - Loans Payable
Note 15 - Foreign Operations
Statistical Measurement [Domain]
Note 16 - Segment Reporting
Maximum [Member]
us-gaap_SharePrice
Share Price (in dollars per share)
Over-Allotment Option [Member]
Note 3 - Acquisition of Amorphous Materials - Consideration Transferred (Details)
Note 3 - Acquisition of Amorphous Materials - Assets Acquired and Liabilities Assumed (Details)
Note 3 - Acquisition of Amorphous Materials - Intangible Assets (Details)
Note 3 - Acquisition of Amorphous Materials - Pro Forma Information (Details)
us-gaap_IncreaseDecreaseInAccountsReceivable
Trade accounts receivable
Note 6 - Revenue - Revenue by Product Group (Details)
Note 7 - Inventories - Inventories (Details)
Note 8 - Property and Equipment - Property and Equipment (Details)
Accounts payable and accrued liabilities
Note 9 - Goodwill and Intangible Assets - Intangible Assets (Details)
Note 9 - Goodwill and Intangible Assets - Future Amortization of Intangibles (Details)
Note 10 - Income Taxes - Income Tax Expense and Effective Tax Rate (Details)
Note 11 - Stock-based Compensation - Stock-based Compensation Expense (Details)
Note 11 - Stock-based Compensation - Valuation Assumptions (Details)
Note 11 - Stock-based Compensation - Award Activity (Details)
Note 11 - Stock-based Compensation - Unrecognized Compensation Cost (Details)
Business Description and Basis of Presentation [Text Block]
Business Combination, Contingent Consideration [Table Text Block]
Note 12 - Earnings (Loss) Per Share - Computation of Earnings per Share (Details)
Note 12 - Earnings (Loss) Per Share - Securities Excluded from Earnings per Share (Details)
Note 13 - Leases - Lease Expense (Details)
Note 13 - Leases - Supplemental Balance Sheet Information (Details)
Note 13 - Leases - Lease Term and Discount Rate Information (Details)
Note 13 - Leases - Supplemental Cash Flow Information (Details)
Note 13 - Leases - Maturities of Lease Liabilities (Details)
Note 14 - Loans Payable - Future Maturities of Loans Payable (Details)
Counterparty Name [Axis]
Series G Convertible Preferred Stock; $0.01 par value; 44,000 shares authorized; 6,492 and 6,492 shares issued and outstanding
Note 15 - Foreign Operations - Revenues by Country (Details)
Effective income tax rate
Effective Income Tax Rate Reconciliation, Percent
Note 15 - Foreign Operations - Long-lived Assets by Country (Details)
Note 16 - Segment Reporting - Reconciliation of Income from Segments (Details)
us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Notes To Financial Statements
Notes To Financial Statements [Abstract]
Options, granted, weighted average exercise price (in dollars per share)
Income Tax Jurisdiction [Domain]
Interest income (expense), net
Leasehold Improvements [Member]
Counterparty Name [Domain]
us-gaap_IncreaseDecreaseInInventories
Inventories
us-gaap_SharesOutstanding
Balances (in shares)
Balances (in shares)
Non-options, outstanding, contractual term (Year)
Segment Reporting [Text Block]
Deferred taxes
Amount of change in deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
Award Type [Axis]
Preferred stock: Series D, $0.01 par value, voting; 500,000 shares authorized; none issued and outstanding
Adjustments to reconcile net loss to net cash used in operating activities:
Plan Name [Axis]
Segment Reporting, Reconciliation of Profit (Loss) by Segment to Consolidated [Table Text Block]
us-gaap_Liabilities
Total liabilities
Current deposits
lpth_BusinessCombinationRecognizedLiabilityAssumedDepositsCurrent
Amount of liability assumed in business combination and recognized at acquisition date, classified as deposits and current.
Plan Name [Domain]
Segment Reporting, Reconciliation of Revenue by Segment to Consolidated [Table Text Block]
Segment Reporting, Reconciliation of Asset by Segment to Consolidated [Table Text Block]
lpth_StockIssuedDuringPeriodSharesNewIssuesAndExistingSharesResold
Stock Issued During Period, Shares, New Issues and Existing Shares Resold (in shares)
Number of new stock issued during the period and existing shares resold.
us-gaap_LiabilitiesAndStockholdersEquity
Total liabilities, convertible preferred stock and stockholders’ equity
Share-based compensation expense
Consolidation Items [Axis]
Segment Reporting [Table]
us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid expenses and deposits
us-gaap_SellingAndMarketingExpense
Sales & marketing
Stock-based compensation on stock options, RSUs & RSAs, net
Selling, general and administrative
Subsequent Event [Member]
Consolidation Items [Domain]
Lessee, Lease, Description [Table]
Share-Based Payment Arrangement [Text Block]
Lease Contractual Term [Axis]
Lease Contractual Term [Domain]
Changes in operating assets and liabilities, net of acquisitions:
Preferred stock, issued (in shares)
Preferred Stock, Shares Issued (in shares)
Useful life, finite-lived intangible assets (Year)
Intangible asset acquired, useful life (Year)
Europe [Member]
Preferred stock, outstanding (in shares)
Preferred Stock, Shares Outstanding (in shares)
Asia [Member]
Preferred stock, authorized (in shares)
Series D Preferred Stock [Member]
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Employee Subscription Rate
Preferred stock, par value (in dollars per share)
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect
Change in cash and cash equivalents
Effect of exchange rate on cash and cash equivalents
us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations
Cash and cash equivalents, beginning of period
Cash and cash equivalents, end of period
Antidilutive Securities, Name [Domain]
Statement [Table]
Income Tax Authority, Name [Axis]
Income Tax Authority, Name [Domain]
Business Combination, Intangible Asset, Acquired, Finite-Lived [Table Text Block]
Prepaid expenses and deposits
Operating right-of-use assets acquired in exchange for operating lease liabilities
Business Combination, Consideration Transferred, Equity Interest, Type [Axis]
Financing cash used for finance leases
Repayment of finance lease obligations
State Administration of Taxation, China [Member]
us-gaap_ForeignCurrencyTransactionGainLossAfterTax
Gain (Loss), Foreign Currency Transaction, after Tax
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Non-options, outstanding (in shares)
Non-options, outstanding (in shares)
Non-options, granted (in shares)
Non-options, granted, weighted average exercise price (in dollars per share)
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Non-options, forfeited (in shares)
Product and Service [Domain]
Product and Service [Axis]
us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization
Finance Lease, Right-of-Use Asset, Accumulated Amortization
Useful life (Year)
us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
June 30, 2027 (remaining nine months)
us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Non-options, exercised (in shares)
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive
Thereafter, operating lease
us-gaap_RepaymentsOfDebt
Repayments of Debt
Property and equipment, net
Total property and equipment, net
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue
Total future minimum payments, operating lease
Total property and equipment
us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization
Less accumulated depreciation and amortization
us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent
Finance leases
us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent
Operating leases
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths
June 30, 2027, operating lease
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Options, forfeited (in shares)
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive
June 30, 2031, operating lease
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)
Schedule of Maturities of Long-Term Debt [Table Text Block]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree
June 30, 2029, operating lease
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options, outstanding (in shares)
Options, outstanding (in shares)
Commitments and Contingencies Disclosure [Text Block]
Nature of Expense [Axis]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo
June 30, 2028, operating lease
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options, outstanding, weighted average exercise price (in dollars per share)
Options, outstanding, weighted average exercise price (in dollars per share)
Statement [Line Items]
us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour
June 30, 2030, operating lease
Private Placement [Member]
Common stock, issued (in shares)
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Common stock, outstanding (in shares)
Award Type [Domain]
Weighted-average risk-free interest rate
Common stock, authorized (in shares)
Weighted-average expected volatility
Dividend yields
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Proceeds from sale-leaseback of equipment
The cash inflow from sale of machinery and equipment.
Common stock: Class A, $0.01 par value, voting; 94,500,000 shares authorized; 70,087,678 and 69,963,045 shares issued and outstanding
June 30, 2028
Fair Value of Financial Instruments, Policy [Policy Text Block]
June 30, 2029
Depreciation of lease assets
Schedule of Inventory, Current [Table Text Block]
June 30, 2027 (remaining nine months)
us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from Issuance of Common Stock
Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block]
Accounts payable
us-gaap_FinanceLeaseLiability
Present value of finance lease liabilities
us-gaap_PolicyTextBlockAbstract
Accounting Policies
After June 30, 2031
us-gaap_DisclosureTextBlockAbstract
Notes to Financial Statements
June 30, 2030
us-gaap_TableTextBlock
Notes Tables
June 30, 2031
Loans payable, less current portion
us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive
Thereafter, finance lease
us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive loss
Finance lease obligation, less current portion
Finance leases
us-gaap_FinanceLeaseLiabilityPaymentsDue
Total future minimum payments, finance lease
Disposal Group Classification [Axis]
Loans payable, current portion
Less current portion
Finance lease obligation, current portion
Finance leases
Proceeds from issuance of common stock under private equity placement, net of fees
Disposal Group Classification [Domain]
us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount
Less imputed interest, finance lease
us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree
June 30, 2029, finance lease
us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo
June 30, 2028, finance lease
us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive
June 30, 2031, finance lease
Subsequent Events [Text Block]
us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour
June 30, 2030, finance lease
Concentration Risk Type [Axis]
Accrued liabilities
us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths
June 30, 2027, finance lease
Interest on lease liabilities
Operating cash used for finance leases
Accrued payroll and benefits
Significant Accounting Policies [Text Block]
us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount
Less imputed interest, operating lease
Operating cash used for operating leases
Operating lease liabilities, noncurrent
Operating leases
Options, outstanding, contractual term (Year)
us-gaap_OperatingLeaseLiability
Present value of operating lease liabilities
Operating lease liabilities, current
Operating leases
Options, exercisable, contractual term (Year)
Options, unexercisable, contractual term (Year)
Weighted-average expected term, in years (Year)
Concentration Risk Type [Domain]
Business Combination, Contingent Consideration, Type [Domain]
Earnout to be Paid in Shares [Member]
Represents earnout to be paid in shares.
Capitalization, Equity [Table]
Earnout to be Paid in Cash [Member]
Represents earnout to be paid in cash.
us-gaap_LongTermDebtNoncurrent
Non-current portion
Selling Expense [Member]
Represents selling expense.
Business Combination, Contingent Consideration, Type [Axis]
us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
June 30, 2028
Amorphous Materials, LLC (“AML”) [Member]
Represents Amorphous Materials, LLC (“AML”).
Income Tax Jurisdiction, Domestic Federal [Member]
lpth_SharebasedPaymentArrangementNonvestedAwardCostNotYetRecognizedYearFour
June 30, 2031
Amount of cost not yet recognized for nonvested award under share-based payment arrangement expected to be recognized in year four.
lpth_SharebasedPaymentArrangementNonvestedAwardCostNotYetRecognizedYearFive
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Year Five
Amount of cost not yet recognized for nonvested award under share-based payment arrangement, expected to be recognized in year five.
Class A Common Stock Per Tranche [Member]
Represents Class A Common Stock per tranche.
Contingent Consideration Payments, Class A Common Stock [Member]
represents Class A Common Stock for contingent consideration payments.
CHINA
us-gaap_LongTermDebt
Total payments
Intangible Asset, Finite-Lived, Class [Axis]
Statement of Stockholders' Equity [Abstract]
Within Six Months [Member]
Within Six Months
Within Twelve Months [Member]
Within Twelve Months
Intangible Asset, Finite-Lived, Class [Domain]
lpth_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumValueOfSharesPerEmployee
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Value of Shares Per Employee
The highest value of shares an employee can purchase under the plan per period.
Statement of Cash Flows [Abstract]
UNITED KINGDOM
Stockholders’ equity:
Equity Components [Axis]
us-gaap_PaymentsOfStockIssuanceCosts
Payments of Stock Issuance Costs
Equity Component [Domain]
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Net assets acquired
Foreign Currency Disclosure [Text Block]
Equity [Text Block]
AOCI Attributable to Parent [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Cost of sales
Cost of goods sold
Inventory write-offs to allowance
Inventory Write-down
Property and equipment, gross
ISRAEL
Subsequent Event Type [Domain]
Provision for credit losses
Subsequent Event [Table]
Subsequent Event Type [Axis]
Deferred tax assets, net
Public Placement [Member]
A public placement is a direct offering of securities to a limited number of sophisticated investors such as insurance companies, pension funds, mezzanine funds, stock funds and trusts.
Sale of Stock [Axis]
lpth_SharebasedPaymentArrangementNonvestedAwardCostNotYetRecognizedYearThree
June 30, 2030
Amount of cost not yet recognized for nonvested award under share-based payment arrangement in the third fiscal year.
Furniture and Fixtures [Member]
Stock-based compensation on stock options, RSUs & RSAs
lpth_ProceedsFromPublicOfferingNet
Proceeds from Public Offering, Net
Represents the net proceeds from the public offering.
Intangible Asset and Goodwill [Text Block]
LATVIA
lpth_OperatingLeaseRightofuseAssetPeriodicIncreaseReduction
Change in operating lease assets and liabilities
Represents the periodic increase (reduction) for the operating lease assets and liabilities.
Public Offering [Member]
Represents the public offering.
Deferred tax liabilities, net
Share-Based Payment Arrangement, Nonvested Award, Cost [Table Text Block]
Share-Based Payment Arrangement, Option [Member]
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Supplemental disclosure of cash flow information:
Current liabilities:
us-gaap_LiabilitiesCurrent
Total current liabilities
Temporary equity, issued (in shares)
Temporary equity, outstanding (in shares)
Temporary equity, authorized (in shares)
Trade accounts receivable, net of allowance of $112,025 and $63,162
lpth_BusinessCombinationAggregateEarnoutPayments
Business Combination, Aggregate Earnout Payments
The aggregate value of earnout payments in the business combination.
G5 Infrared [Member]
G5 Infrared
Lease, Cost [Table Text Block]
Customer Relationships [Member]
Acquisition Notes [Member]
Acquisition Notes
Other Commitments [Table]
us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Loss on disposal of property and equipment
Loss on disposal of equipment
Accrued liabilities
lpth_BusinessCombinationRecognizedLiabilityAssumedAccruedLiabilities
Amount of accrued liabilities assumed in business combination and recognized at acquisition date, classified as current.
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax
Finite-lived intangible assets, accumulated amortization
Know-how [Member]
Know-how
Visimid Technologies [Member]
Visimid Technologies
Engineering Services [Member]
Engineering Services
us-gaap_GeneralAndAdministrativeExpense
General & administrative
Assemblies and Modules [Member]
Assemblies and Modules
Loss before income taxes
us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Loss before income taxes
us-gaap_GainsLossesOnExtinguishmentOfDebt
Gain (Loss) on Extinguishment of Debt
Visible Components [Member]
Visible Components
Infrared Components [Member]
Infrared Components
Additional paid-in capital
ISP Optics Latvia [Member]
ISP Optics Latvia
Debt Disclosure [Text Block]
Computer Equipment and Software [Member]
Computer Equipment and Software
Manufacturing Equipment [Member]
Manufacturing Equipment
LPOIZ [Member]
LPOIZ
Discontinued Operations, Disposed of by Sale [Member]
Use of Estimates, Policy [Policy Text Block]
lpth_SharebasedCompensationArrangementBySharebasedPaymentAwardForfeitureRate
Share-based Compensation Arrangement by Share-based Payment Award, Forfeiture Rate
The forfeiture rate of in the share-based payment compensation arrangement.
lpth_SharebasedCompensationArrangementBySharebasedPaymentAwardDiscountFromMarketPrice
Share-Based Compensation Arrangement by Share-Based Payment Award, Discount from Market Price
Discount from fair value on purchase date that participants pay for shares.
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)
Employee Stock Purchase Plan
Non-options, exercisable (in shares)
Number of fully vested and expected to vest exercisable non-options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.
Restricted Stock Awards and Restricted Stock Units [Member]
Restricted Stock Awards and Restricted Stock Units
SICP 2002 Omnibus Plan [Member]
SICP 2002 Omnibus Plan
us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of property and equipment
Issuance of common stock under private equity placement
Latvian State Revenue Service [Member]
Latvian State Revenue Service
Lessee, Operating Leases [Text Block]
Exercise of stock options, RSUs & RSAs, net
2014 ESPP [Member]
2014 ESPP
UNITED STATES
SICP 2018 Omnibus Plan [Member]
SICP 2018 Omnibus Plan
Non-US [Member]
lpth_SharebasedPaymentArrangementNonvestedAwardCostNotYetRecognizedYearTwo
June 30, 2029
Amount of cost not yet recognized for nonvested award under share-based payment arrangement in the second fiscal year.
lpth_SharebasedPaymentArrangementNonvestedAwardCostNotYetRecognizedYearOne
June 30, 2028
Amount of cost not yet recognized for nonvested award under share-based payment arrangement in the next fiscal year.
us-gaap_DebtInstrumentFaceAmount
Debt Instrument, Face Amount
Issuance of common stock for acquisition
Stock Issued During Period, Value, Acquisitions
Current assets:
Non-options, unexercisable, contractual term (Year)
Weighted average remaining contractual term for fully vested and expected to vest non-options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.
Non-options, unexercisable (in shares)
Number of fully vested and expected to vest non-options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.
lpth_SharebasedPaymentArrangementNonvestedAwardCostNotYetRecognizedRemainingFiscalYear
June 30, 2027 (remaining nine months)
Amount of cost not yet recognized for nonvested award under share-based payment arrangement in the remainder of the fiscal year.
Geographic Concentration Risk [Member]
us-gaap_AssetsCurrent
Total current assets
lpth_NumberOfOperatingLeases
Number of Operating Leases
The number of operating leases.
Exercise of stock options, RSUs & RSAs, net (in shares)
Employee Stock Purchase Plan (in shares)
lpth_FinanceLeaseCost
Total finance lease cost
Amount of finance lease cost.
Visimid Plano, TX Lease [Member]
Visimid Plano, TX Lease
us-gaap_GrossProfit
Gross profit
Series G Convertible Preferred Stock [Member]
Series G Convertible Preferred Stock
Trade Names [Member]
Issuance of common stock under private equity placement (in shares)
Stock Issued During Period, Shares, New Issues (in shares)
Restricted Stock Units (RSUs) [Member]
Series G Convertible Preferred Stock and Warrants [Member]
Series G Convertible Preferred Stock and Warrants
Debt Instrument, Name [Domain]
Supplemental Cash Flow Information on Leases [Table Text Block]
Tabular disclosure of supplemental cash flow information on leases.
Issuance of common stock for acquisition (in shares)
Stock Issued During Period, Shares, Acquisitions (in shares)
us-gaap_DebtInstrumentMaturityDate
Debt Instrument, Maturity Date
Lessee, Operating and Finance Lease, Liability, to be Paid, Maturity
Tabular disclosure of undiscounted cash flows of lessee's operating and finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.
us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options, exercised (in shares)
us-gaap_DebtInstrumentInterestRateStatedPercentage
Debt Instrument, Interest Rate, Stated Percentage
lpth_LeaseAssets
Total lease assets
Lease assets, of both operating and finance leases.
Supplemental Balance Sheet Information on Leases [Table Text Block]
Tabular disclosure on supplemental balance sheet information related to leases.
us-gaap_Depreciation
Depreciation
Lease, Terms and Discount Rates [Table Text Block]
Tabular disclosure on the terms and discount rates of both operating and finance leases.
lpth_LeaseLiabilities
Total lease liabilities
Lease liabilities, of both current and noncurrent operating and finance leases.
Class of Stock [Domain]
lpth_DebtInstrumentCovenantMinimumEbitda
Debt Instrument, Covenant, Minimum EBITDA
The minimum value of EBITDA that, if not exceeded, will automatically convert the deb instrument.
Schedule of Long-Term Debt Instruments [Table]
Other Foreign Countries [Member]
Other Foreign Countries
Debt Instrument [Axis]
2023 Equipment Loan [Member]
2023 Equipment Loan
2020 Equipment Loan [Member]
2020 Equipment Loan
Temporary equity, par value (in dollars per share)
Cash flows from operating activities:
Cash flows from investing activities:
us-gaap_InventoryRawMaterialsNetOfReserves
Inventory, Raw Materials, Net of Reserves
us-gaap_NetCashProvidedByUsedInOperatingActivities
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)
Intangible Asset, Finite-Lived, and Capitalized Cost, Software to be Sold, Leased, or Marketed, Estimated Amortization Expense [Table Text Block]
us-gaap_NetCashProvidedByUsedInFinancingActivities
Net cash provided by financing activities
Share-Based Payment Arrangement, Activity [Table Text Block]
us-gaap_DebtInstrumentRedemptionPricePercentage
Debt Instrument, Redemption Price, Percentage
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member]
Operating Segments [Member]
Earnout [Member]
Earnout
Accounting Policies [Abstract]
Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table]
Allowance for doubtful accounts
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent
Cash Benchmark [Member]
Cash Benchmark
Long-lived assets
Income Statement [Abstract]
us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits
us-gaap_NumberOfReportableSegments
Number of Reportable Segments
Net loss
Net loss
Net loss
Interest from amortization of loan issuance costs
Amortization of intangible assets
Amortization of intangible assets
Common Class A [Member]
us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Income Tax Disclosure [Text Block]
us-gaap_BusinessCombinationContingentConsiderationLiability
Business Combination, Contingent Consideration, Liability
Restricted Stock [Member]
Proceeds from sale of common stock from Employee Stock Purchase Plan
Accounting Standards Update and Change in Accounting Principle [Table]
Supplemental disclosure of non-cash investing & financing activities:
us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee (in shares)
Options, unexercisable (in shares)
Options, exercisable (in shares)
Options, exercisable, weighted average exercise price (in dollars per share)
Options, unexercisable, weighted average exercise price (in dollars per share)
us-gaap_RepaymentsOfLongTermDebt
Payments on loans payable
Vesting [Axis]
Other income (expense):
Statement of Financial Position [Abstract]
Vesting [Domain]
us-gaap_NonoperatingIncomeExpense
Total other income (expense)
Income taxes paid
us-gaap_LesseeFinanceLeaseTermOfContract1
Lessee, Finance Lease, Term of Contract (Year)
us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1
Finance leases (Year)
Other assets
Document Type
Operating expenses:
Document Information [Line Items]
Document Quarterly Report
us-gaap_LesseeOperatingLeaseTermOfContract
Lessee, Operating Lease, Term of Contract (Year)
us-gaap_ConcentrationRiskPercentage1
Concentration Risk, Percentage
us-gaap_GoodwillPeriodIncreaseDecrease
Goodwill, Period Increase (Decrease)
us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1
Operating leases (Year)
Document Information [Table]
us-gaap_IncreaseDecreaseInOtherCurrentAssets
Other current assets
us-gaap_BusinessAcquisitionsProFormaRevenue
Revenue
Antidilutive securities (in shares)
Antidilutive Securities [Axis]
Entity Interactive Data Current
us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares (in shares)
us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)
Document Transition Report
Number of shares used in per share calculation (diluted) (in shares)
Diluted number of shares (in shares)
us-gaap_OperatingExpenses
Total operating expenses
Corporate
us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net loss
Number of shares used in per share calculation (basic) (in shares)
Basic number of shares (in shares)
us-gaap_DebtInstrumentTerm
Debt Instrument, Term (Month)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Antidilutive Security, Excluded EPS Calculation [Table]
Loss per common share (basic) (in dollars per share)
Issuance of common stock for acquisition
us-gaap_StockIssued1
Issuance of common stock for acquisition
Effective Income Tax Rate Reconciliation [Table]
Income Tax Jurisdiction [Axis]
Intangible assets, net
Amortization of fair value of loan
Finite-lived intangible assets, net
Intangible Asset, Finite-Lived, after Accumulated Amortization
Document Fiscal Period Focus
Finite-lived intangible assets, gross
Document Fiscal Year Focus
Amendment Flag
Common Stock [Member]
Change in fair value of acquisition earnout liabilities
Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease)
Goodwill
Goodwill
Document Period End Date
Property, Plant, and Equipment [Text Block]
Long-Lived Asset, Class [Domain]
Legal Entity [Axis]
Options, granted (in shares)
Operating lease cost
Business Combination, Consideration Transferred, Equity Interest, Type [Domain]
Construction in Progress [Member]
us-gaap_LeaseCost
Total lease cost
Business Combination [Domain]
Entity File Number
Entity Tax Identification Number
Business Combination [Axis]
Disaggregation of Revenue [Table Text Block]
Disaggregation of Revenue [Table]
Entity [Domain]
Entity Central Index Key
Entity Registrant Name
Foreign currency translation adjustment
Entity Current Reporting Status
Business Combination [Table]
Entity Incorporation, State or Country Code
Business Combination, Pro Forma Information [Table Text Block]
Current Fiscal Year End Date
Accounts receivable
Inventory
New product development
New product development
Entity Filer Category
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Total assets acquired
Entity Shell Company
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Total liabilities assumed
Entity Emerging Growth Company
Entity Small Business
us-gaap_OperatingIncomeLoss
Operating loss
Accounts payable
us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Property and equipment
Intangible asset acquired
us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount
us-gaap_SegmentReportingOtherItemAmount
Other non-operating income (expense), net
us-gaap_BusinessCombinationConsiderationTransferred1
Business Combination, Consideration Transferred
Fair value of consideration transferred
Entity Address, State or Province
Entity Address, City or Town
Inventory, Current [Table]
us-gaap_InterestExpenseNonoperating
Interest (income) expense, net
Accumulated deficit
Entity Address, Address Line One
Order or Production Backlog [Member]
City Area Code
Local Phone Number
Entity Address, Postal Zip Code
Revenue from Contract with Customer [Text Block]
Preferred Stock [Member]
Title of 12(b) Security
Security Exchange Name
Trading Symbol
Assets:
us-gaap_DebtInstrumentConvertibleConversionPrice1
Debt Instrument, Convertible, Conversion Price (in dollars per share)
Liabilities:
Class of Stock [Axis]
Net working capital adjustment
Entity Common Stock, Shares Outstanding
Earnings Per Share [Text Block]
Other current assets
Property, Plant, and Equipment [Table]
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share (in dollars per share)
Equity portion of consideration
Liabilities incurred
Other expense, net
Long-Lived Asset, Class [Axis]
Sale of Stock [Domain]
us-gaap_Assets
Total assets
Cash and cash equivalents
Cash and Cash Equivalent
Geographical [Domain]
Geographical [Axis]
Loss per common share (diluted) (in dollars per share)
us-gaap_ContractWithCustomerLiability
Contract with Customer, Liability
Cash consideration
Payments to Acquire Businesses, Gross
Depreciation and amortization
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Interest paid in cash
Inventory Disclosure [Text Block]
Finished goods
Intangible Asset, Finite-Lived [Table Text Block]
Intangible Asset, Finite-Lived [Table]
Interim Period, Costs Not Allocable [Domain]
lpth_EarningsPerShareBasicNetOfAccretion
Basic (in dollars per share)
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period net of accretion.
Inventories, net
Total inventories, net
lpth_EarningsPerShareDilutedNetOfAccretion
Diluted (in dollars per share)
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period net of accretion.
Securities Purchase Agreement [Member]
Securities Purchase Agreement
Lightpath [Member]
Lightpath
Business Combination [Text Block]
lpth_BusinessCombinationRemainingPotentialEarnout
Business Combination, Remaining Potential Earnout
The remaining potential earnout in the business combination.
Raw materials
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
us-gaap_StockholdersEquity
Total stockholders’ equity
Balances
Balances
Work in process
North Run [Member]
North Run
lpth_DisposalGroupIncludingDiscontinuedOperationPercentSold
Disposal Group, Including Discontinued Operation, Percent Sold
The percent of the disposal group sold.
us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities
Payment for Contingent Consideration Liability, Financing Activities
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Domain]
us-gaap_InventoryValuationReserves
Allowance for obsolescence
us-gaap_FinanceLeaseRightOfUseAsset
Finance lease assets
Operating lease right-of-use assets
Operating lease assets
ecd_Rule10b51ArrTrmntdFlag
Rule 10b5-1 Arrangement Terminated [Flag]
Property, Plant, and Equipment [Table Text Block]
ecd_Rule10b51ArrAdoptedFlag
Rule 10b5-1 Arrangement Adopted [Flag]
lpth_PolicyTable
Revenue
Revenue, net
Revenue
Commitments and Contingencies