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Consolidated Statements of Cash Flows (Unaudited) (USD $)
6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities    
Net loss $ (437,837)us-gaap_NetIncomeLoss $ (282,378)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 275,222us-gaap_DepreciationDepletionAndAmortization 424,490us-gaap_DepreciationDepletionAndAmortization
Interest from amortization of debt costs 13,270us-gaap_AmortizationOfFinancingCosts 10,047us-gaap_AmortizationOfFinancingCosts
Loss on disposal of property and equipment 218us-gaap_GainLossOnDispositionOfAssets1 1,098us-gaap_GainLossOnDispositionOfAssets1
Stock based compensation 138,075us-gaap_ShareBasedCompensation 227,646us-gaap_ShareBasedCompensation
Provision for doubtful accounts receivable (13,784)us-gaap_ProvisionForDoubtfulAccounts 5,813us-gaap_ProvisionForDoubtfulAccounts
Change in fair value of warrant liability (480,826)us-gaap_FairValueAdjustmentOfWarrants 53,965us-gaap_FairValueAdjustmentOfWarrants
Deferred rent (42,269)lpth_DeferredRent (79,586)lpth_DeferredRent
Changes in operating assets and liabilities:    
Trade accounts receivables 75,590us-gaap_IncreaseDecreaseInAccountsReceivable (211,965)us-gaap_IncreaseDecreaseInAccountsReceivable
Other receivables 816us-gaap_IncreaseDecreaseInOtherReceivables 100,000us-gaap_IncreaseDecreaseInOtherReceivables
Inventories 12,547us-gaap_IncreaseDecreaseInInventories (589,741)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (39,515)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (157,911)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued liabilities 185,232us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 282,468us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue 3,500us-gaap_IncreaseDecreaseInDeferredRevenue (1,966)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash (used in) operating activities (309,761)us-gaap_NetCashProvidedByUsedInOperatingActivities (218,020)us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities    
Purchase of property and equipment (409,739)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (942,408)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (409,739)us-gaap_NetCashProvidedByUsedInInvestingActivities (942,408)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities    
Proceeds from sale of common stock from employee stock purchase plan 13,229us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans 2,512us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
Proceeds from exercise of warrants, net of costs    1,538,808us-gaap_ProceedsFromWarrantExercises
Payments on loan payable (205,271)us-gaap_RepaymentsOfLongTermDebt   
Payments on capital lease obligation (3,398)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (4,612)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Borrowings on loan payable 513,777us-gaap_ProceedsFromOtherShortTermDebt   
Net cash provided by financing activities 318,337us-gaap_NetCashProvidedByUsedInFinancingActivities 1,536,708us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate on cash and cash equivalents (813)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 13,795us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Change in cash and cash equivalents (401,976)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 390,075us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 1,197,080us-gaap_CashAndCashEquivalentsAtCarryingValue 1,565,215us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 795,104us-gaap_CashAndCashEquivalentsAtCarryingValue 1,955,290us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:    
Interest paid in cash 10,131us-gaap_InterestPaid 420us-gaap_InterestPaid
Income taxes paid 1,036us-gaap_IncomeTaxesPaid 2,166us-gaap_IncomeTaxesPaid
Vesting of restricted stock units    (1,912)lpth_VestingOfRestrictedStockUnits
Supplemental disclosure of non-cash investing & financing activities:    
Purchase of equipment through capital lease arrangements    12,972us-gaap_FairValueOfAssetsAcquired
Reclassification of tooling costs to inventory    425,626lpth_ReclassificationOfToolingCostsToInventory
Reclassification of warrant liability upon exercise    $ 277,070lpth_ReclassificationOfWarrantLiabilityUponExercise