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Warrants (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Shares of Ordinary Shares Underlying Warrants | shares	1,080,645
Exercise Price Per Share | $ / shares	$ 4.50
Issuance Date	Mar. 22, 2016
Expiration Date	Sep. 22, 2021

X

- Definition

Expiration date of the warrant.

+ References

No definition available.

+ Details

Name:	orpn_ClassOfWarrantOrRightExpirationDate
Namespace Prefix:	orpn_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Issuance date of the warrant.

+ References

No definition available.

+ Details

Name:	orpn_ClassOfWarrantOrRightIssuanceDate
Namespace Prefix:	orpn_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant