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Fair Value of Financial Instruments (Details) (USD $)
3 Months Ended 12 Months Ended
Oct. 31, 2014
Jul. 31, 2014
Jul. 31, 2013
Derivative Liabilities At Fair Value [Line Items]      
Derivative Liabilities, Beginning Balance $ 9,000us-gaap_DerivativeLiabilitiesCurrent $ 51,000us-gaap_DerivativeLiabilitiesCurrent $ 319,000us-gaap_DerivativeLiabilitiesCurrent
Derivative Issuances       
Settlement of conversion feature liability   (97,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements (33,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements
Adjustments to estimated fair value 1,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings 55,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings (235,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Derivative Liabilities, Ending Balance 10,000us-gaap_DerivativeLiabilitiesCurrent 9,000us-gaap_DerivativeLiabilitiesCurrent 51,000us-gaap_DerivativeLiabilitiesCurrent
Warrants [Member]      
Derivative Liabilities At Fair Value [Line Items]      
Derivative Liabilities, Beginning Balance 9,000us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
51,000us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
286,000us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
Derivative Issuances       
Settlement of conversion feature liability   (97,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
 
Adjustments to estimated fair value 1,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
55,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
(235,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
Derivative Liabilities, Ending Balance 10,000us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
9,000us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
51,000us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_NoteWarrantMember
Conversion Feature Liability [Member]      
Derivative Liabilities At Fair Value [Line Items]      
Derivative Liabilities, Beginning Balance     33,000us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= pure_BeneficialConversionFeatureLiabilityMember
Derivative Issuances       
Settlement of conversion feature liability     $ (33,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlements
/ us-gaap_SubsidiarySaleOfStockAxis
= pure_BeneficialConversionFeatureLiabilityMember