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Nil Coupon Non-Redeemable Convertible Unsecured Loan Notes (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) shares $ / shares | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |
Principal amount | $ | $ 76 | $ 76
Number of equity instruments (in shares) | shares | 6,715 |
Share Price (in dollars per share) | $ 1.15 |
Carrying amount | $ | $ 8 |
Minimum |  |
Debt Instrument [Line Items] |  |
Conversion price (in dollars per share) | $ 6.50 |
Maximum |  |
Debt Instrument [Line Items] |  |
Conversion price (in dollars per share) | $ 11.43 |

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