SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	Jun. 01, 2012
Common stock
Stockholders' equity
Reverse split ratio	0.167
Class C special stock
Stockholders' equity
Reverse split ratio	0.167

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

No definition available.

Name:	bpax_ReverseStockSplitConversionRatio
Namespace Prefix:	bpax_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant