Name:	bpax_CollaborativeArrangementAdditionalAmountThatEntityEntitledToReceiveAsPercentageOfMilestoneAndRoyaltyPaymentsReceivedFromCounterparty
Namespace Prefix:	bpax_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the total amount that could be received based on certain regulatory or commercial events achieved by members to the agreement.

No definition available.

Name:	bpax_CollaborativeArrangementPotentialMilestonePaymentsReceivable
Namespace Prefix:	bpax_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the total amount of royalties and milestone payments receivable under the agreement.

No definition available.

Name:	bpax_CollaborativeArrangementRoyaltiesAndMilestonePaymentsReceivable
Namespace Prefix:	bpax_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the royalty rate as a percentage of net sales.

No definition available.

Name:	bpax_CollaborativeArrangementRoyaltyRateAsPercentageOfNetSales
Namespace Prefix:	bpax_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the amount of threshold of net sales of products upon achievement of which milestone payments will be receivable.

No definition available.

Name:	bpax_CollaborativeArrangementThresholdAmountOfNetSalesOfProductsForPotentialMilestonePaymentsReceivable
Namespace Prefix:	bpax_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the period from the first commercial sale of the product for which royalty is payable.

No definition available.

Name:	bpax_PeriodFromFirstCommercialSaleOfProductForWhichRoyaltyIsPayable
Namespace Prefix:	bpax_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Cash received from collaborators during the current period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 27

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585