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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

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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash outflow related to one time bonus payment. + References No definition available. + Details
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Namespace Prefix: | orpn_
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Balance Type: | credit
Period Type: | instant

X
- Definition It represents the consideration received from the office administration services fee. + References No definition available. + Details
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Namespace Prefix: | orpn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
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- 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
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- 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
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Period Type: | duration

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Details
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