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Related party transactions (Tables) | 12 Months Ended
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Dec. 31, 2016
Related Party Transactions [Abstract] |
Schedule of Related Party Transactions [Table Text Block] | Balances with related parties:
|  | December 31, |
|  | 2016 |  | 2015 |
|  | U.S. dollars in thousands |
Other accounts payables |  | $ | 1 |  | $ | 132 |
Schedule Of Related Party Expenses [Table Text Block] | Related parties’ expenses:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | U.S. dollars in thousands |
Research and development expense |  | $ | 318 |  |  | $ | 312 |  |  | $ | 145 |
General and administrative expense |  | $ | 207 |  |  | $ | 196 |  |  | $ | 467 |

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- Definition Tabular disclosure of related party expenses during period. + References No definition available. + Details
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Namespace Prefix: | orpn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration