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Accounts Payable - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable [Line Items]    
Accounts payable $ 41,026us-gaap_AccountsPayableCurrentAndNoncurrent $ 76,109us-gaap_AccountsPayableCurrentAndNoncurrent
Accounts payable, trade 38,127us-gaap_AccountsPayableTradeCurrentAndNoncurrent  
Accounts payable, other, current 2,899us-gaap_AccountsPayableOtherCurrent  
Accounts Payable, Related Parties, Current 0us-gaap_AccountsPayableRelatedPartiesCurrent  
Clinical Trials [Member]    
Accounts Payable [Line Items]    
Accounts Payable, Related Parties, Current $ 100,450us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_NatureOfExpenseAxis
= bpth_ClinicalTrialsMember