Operating leases, commitments and security deposit (Details Textual) In Thousands, unless otherwise specified	6 Months Ended				12 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2012 GBP (£)	Jun. 30, 2011 USD ($)	Jun. 30, 2011 GBP (£)	Dec. 31, 2006 USD ($)	Dec. 31, 2006 GBP (£)
Operating Leases, Property Rent, Services and Related Costs					$ 516	£ 330
Operating Leases, Monthlty Rental Payments	4	2	13	8
Operating Leases, Rental Deposit	6	4	25	16
Operating Leases Refundable Rental Deposit			39
Operating Leases Rental Payments			240
Operating Leases Rental Deposit Refunded	128
Labor and Related Expense	10
Payments For Financial Advisory and Consulting Agreement	5
Operating Leases, Rent Expense	$ 72		$ 298