Accrued License Payments - Related Party	9 Months Ended
Sep. 30, 2012
Accrued License Payments Related Party Abstract
Accrued License Payments - Related Party	6. Accrued License Payments – Related Party Accrued license payments – related party totaling $50,000 were included in Current Liabilities as of September 30, 2012. This amount represents payment of past patent expenses incurred by MD Anderson prior to entering into the license with the Company. It is expected that the accrued license payments will be made to MD Anderson in the first half of 2013.

Collaborative and License Arrangement Disclosure [Text Block]

No definition available.

Name:	bpth_CollaborativeAndLicenseArrangementDisclosureTextBlock
Namespace Prefix:	bpth_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration