Name:	bpth_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayTrancheOne
Namespace Prefix:	bpth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Second tranche of employee gross pay for which the employer contributes a matching contribution to a defined contribution plan, as a percentage.

No definition available.

Name:	bpth_DefinedContributionPlanEmployerMatchingContributionPercentOfEmployeesGrossPayTrancheTwo
Namespace Prefix:	bpth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of the employee's first 3% of the employee's base salary contributed into the Plan.

No definition available.

Name:	bpth_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchFirst3OfBaseSalary
Namespace Prefix:	bpth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Percentage employer matches of the employee's next 2% after the first 3% of the employee's base salary contributed into the Plan.

No definition available.

Name:	bpth_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchOnNext2OfBaseSalary
Namespace Prefix:	bpth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

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

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920