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Derivative Financial Instruments (Warrant Liability) (Details) (Common Stock Warrants [Member], USD $)
6 Months Ended
Dec. 31, 2014
Common Stock Warrants [Member]
 
Method used Lattice model
Equivalent volatility 50.34%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Equivalent interest rate 0.62%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Floor 1.1500us-gaap_DerivativeFloorPrice
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Greater of estimated stock price or floor $ 1.1500us-gaap_SharePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Probability price less than strike 77.30%lpth_ProbabilityPriceStrike
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Fair Value of call $ 0.2090us-gaap_FairValueInputsOfferedQuotes
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Probability of fundamental transaction occuring 5.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember