BASIS OF PRESENTATION (Details)	1 Months Ended
Jun. 30, 2012
BASIS OF PRESENTATION
Reverse stock split conversion ratio	0.1667

Represents the conversion ratio used in the calculation of reverse stock split.

No definition available.

Name:	bpax_StockholdersEquityReverseStockSplitConversionRatio
Namespace Prefix:	bpax_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration