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Related party transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended							12 Months Ended
	Aug. 31, 2016	Dec. 31, 2015	Aug. 31, 2014	Apr. 30, 2014	Sep. 30, 2013	Aug. 31, 2013	Jul. 31, 2013	Dec. 31, 2015
Shareholder [Member]
Related Party Transaction [Line Items]
Salaries, Wages and Officers' Compensation	$ 30						$ 1
Payments for Other Fees			$ 25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	30,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 1.62
Employee [Member]
Related Party Transaction [Line Items]
Payments for Other Fees		$ 15
Family Of Shareholder [Member]
Related Party Transaction [Line Items]
Payments for Other Fees		1
Proceeds From Monthly Office Administration Services Fee					$ 6
Advisor [Member]
Related Party Transaction [Line Items]
Salaries, Wages and Officers' Compensation								$ 28
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Salaries, Wages and Officers' Compensation				$ 19		$ 15		250
One Time Bonus			90
Chief Financial Officer [Member]
Related Party Transaction [Line Items]
Salaries, Wages and Officers' Compensation				$ 15		$ 6
One Time Bonus			$ 80
Payments For Bonus		$ 70						$ 70

X

- Definition

The one time bonus to be paid by the entity.

+ References

No definition available.

+ Details

Name:	orpn_OneTimeBonus
Namespace Prefix:	orpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Cash outflow related to one time bonus payment.

+ References

No definition available.

+ Details

Name:	orpn_PaymentsForBonus
Namespace Prefix:	orpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

It represents the consideration received from the office administration services fee.

+ References

No definition available.

+ Details

Name:	orpn_ProceedsFromMonthlyOfficeAdmininstrationServicesFee
Namespace Prefix:	orpn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cash outflow for fees classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

+ Details

Name:	us-gaap_PaymentsForFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Expenditures for salaries for officers and non-officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

+ References

No definition available.

+ Details

Name:	us-gaap_SalariesWagesAndOfficersCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=orpn_ShareholderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=orpn_EmployeeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=orpn_FamilyOfShareholderMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=orpn_AdvisorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_ChiefFinancialOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: