Nil Coupon Non-Redeemable Convertible Unsecured Loan Notes (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) shares $ / shares	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Principal amount | $	$ 76	$ 76
Number of equity instruments (in shares) | shares	6,715
Share Price (in dollars per share)	$ 1.89
Carrying amount | $	$ 13
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