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Derivative Financial Instruments (Warrant Liability) (Details) (Common Stock Warrants [Member], USD $)
9 Months Ended
Mar. 31, 2015
Common Stock Warrants [Member]
 
Method used Lattice model
Equivalent volatility 60.06%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Equivalent interest rate 0.63%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 74.20%lpth_ProbabilityPriceStrike
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Fair Value of call $ 0.2970us-gaap_FairValueInputsOfferedQuotes
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember
Probability of fundamental transaction occuring 5.00%us-gaap_FairValueInputsProbabilityOfDefault
/ us-gaap_ClassOfWarrantOrRightAxis
= us-gaap_WarrantMember