Name:	bpth_ClinicalTrialExpensesPayable
Namespace Prefix:	bpth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying value as of the balance sheet date of drug manufacturing, development and testing expenses incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

No definition available.

Name:	bpth_DrugManufacturingDevelopmentAndTestingExpensesPayable
Namespace Prefix:	bpth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying value as of the balance sheet date of legal and patent fees incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

No definition available.

Name:	bpth_LegalAndPatentFeesPayable
Namespace Prefix:	bpth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying value as of the balance sheet date of other fees incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

No definition available.

Name:	bpth_OtherFeesPayable
Namespace Prefix:	bpth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481372/852-10-55-10

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1