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Accrued Expense - Additional Information (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Accounts Payable and Accrued Liabilities [Line Items]    
Accrued expense $ 253,445us-gaap_AccruedLiabilitiesCurrent $ 66,739us-gaap_AccruedLiabilitiesCurrent
Accrued expense - related party $ 67,050bpth_AccruedLiabilitiesRelatedPartiesCurrent $ 52,050bpth_AccruedLiabilitiesRelatedPartiesCurrent