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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenue $ 0us-gaap_Revenues $ 0us-gaap_Revenues
Operating expenses    
Research and development 592,481us-gaap_ResearchAndDevelopmentExpense 107,641us-gaap_ResearchAndDevelopmentExpense
General and administrative 786,412us-gaap_GeneralAndAdministrativeExpense 380,850us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 1,378,893us-gaap_OperatingExpenses 510,210us-gaap_OperatingExpenses
Net operating loss (1,378,893)us-gaap_OperatingIncomeLoss (510,210)us-gaap_OperatingIncomeLoss
Other income (expense)    
Interest income 4,255us-gaap_InvestmentIncomeInterest 5,573us-gaap_InvestmentIncomeInterest
Other expense 0us-gaap_OtherNonoperatingExpense (239)us-gaap_OtherNonoperatingExpense
Total Other Income (Expense) 4,255us-gaap_NonoperatingIncomeExpense 5,334us-gaap_NonoperatingIncomeExpense
Net Loss (1,374,638)us-gaap_NetIncomeLoss (504,876)us-gaap_NetIncomeLoss
Loss per share    
Net loss per share, basic and diluted $ (0.02)us-gaap_EarningsPerShareBasicAndDiluted $ (0.01)us-gaap_EarningsPerShareBasicAndDiluted
Basic and diluted weighted average number of common shares outstanding 89,762,872us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 89,237,872us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Related Party    
Operating expenses    
Research and development $ 0us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bpth_RelatedPartyMember
$ 21,719us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= bpth_RelatedPartyMember