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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Product Liability Contingency [Line Items]  
Estimates reimbursable past patent expenses $ 75,000us-gaap_CostOfReimbursableExpense
Patent expense per quarter 25,000bpth_AccruedPatentExpenseCurrent
Accounts payable and accrued liabilities 100,000us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
Accounts Payable and Accrued Expense Related Party 167,500bpth_AccountsPayableAndAccruedLiabilitiesRelatedPartyCurrent
Drug Product Testing Agreement Consideration To Be Paid In Stages 250,000bpth_DrugProductTestingAgreementConsiderationToBePaidInStages
Operating Leases, Future Minimum Payments Due $ 382,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue