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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Amortization $ 160,625us-gaap_AdjustmentForAmortization $ 160,625us-gaap_AdjustmentForAmortization $ 185,271us-gaap_AdjustmentForAmortization
Technology Impairment Charge 0us-gaap_OtherAssetImpairmentCharges 0us-gaap_OtherAssetImpairmentCharges 345,000us-gaap_OtherAssetImpairmentCharges
Depreciation 10,284us-gaap_Depreciation 0us-gaap_Depreciation 0us-gaap_Depreciation
Research and Development Expense [Member]      
Equity compensation 83,139us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
32,879us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
53,645us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Amortization 160,625us-gaap_AdjustmentForAmortization
/ dei_LegalEntityAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
160,625us-gaap_AdjustmentForAmortization
/ dei_LegalEntityAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
185,271us-gaap_AdjustmentForAmortization
/ dei_LegalEntityAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
General and Administrative Expense [Member]      
Stock option and warrant expense $ 321,011bpth_ShareBasedCompensationStockOptionAndWarrantExpense
/ dei_LegalEntityAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 671,601bpth_ShareBasedCompensationStockOptionAndWarrantExpense
/ dei_LegalEntityAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 9,740bpth_ShareBasedCompensationStockOptionAndWarrantExpense
/ dei_LegalEntityAxis
= us-gaap_GeneralAndAdministrativeExpenseMember