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Fair Value (Details 3) (Scottish Enterprise Agreement)
1 Months Ended
Jun. 30, 2009
tranche
Sep. 30, 2012
USD ($)
Sep. 30, 2012
GBP (£)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
GBP (£)
Jan. 06, 2010
USD ($)
Jan. 06, 2010
GBP (£)
Dec. 31, 2009
USD ($)
Jul. 02, 2009
USD ($)
Jul. 02, 2009
GBP (£)
Jul. 01, 2009
USD ($)
Jul. 01, 2009
GBP (£)
Jun. 22, 2009
USD ($)
Jun. 22, 2009
GBP (£)
Scottish Enterprise Agreement                            
Maximum guaranteed amount potentially due to SE   $ 6,500,000 £ 4,000,000 $ 6,200,000 £ 4,000,000     $ 8,000,000           £ 5,000,000
Modified payment for which parties agreed                         1,700,000 1,000,000
Number of tranches in which modified payment will be paid 2                          
Amount paid         4,000,000 800,000 500,000   800,000 500,000 800,000 500,000    
Potential amount to be paid if staffing levels reduced below the prescribed levels   6,200,000 3,800,000 5,900,000 3,800,000                  
Share price (in dollars per share)       $ 4.13                    
Fair value of the liability   $ 20,000   $ 20,000