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Accounts Payable - Additional Information (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Accounts Payable [Line Items]    
Accounts payable $ 76,556us-gaap_AccountsPayableCurrentAndNoncurrent $ 41,026us-gaap_AccountsPayableCurrentAndNoncurrent
Clinical Trials [Member]    
Accounts Payable [Line Items]    
Accounts Payable, Related Parties, Current   $ 100,450us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_NatureOfExpenseAxis
= bpth_ClinicalTrialsMember