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FAIR VALUE (Details 3) (Scottish Enterprise Agreement)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2009
tranche
Jun. 30, 2013
USD ($)
Jun. 30, 2013
GBP (£)
Dec. 31, 2012
USD ($)
Dec. 31, 2012
GBP (£)
Jan. 06, 2010
USD ($)
Jan. 06, 2010
GBP (£)
Dec. 31, 2009
USD ($)
Jul. 02, 2009
USD ($)
Jul. 02, 2009
GBP (£)
Jun. 22, 2009
USD ($)
Jun. 22, 2009
GBP (£)
Scottish Enterprise Agreement                        
Maximum guaranteed amount potentially due to SE   $ 6,100,000 £ 4,000,000 $ 6,500,000       $ 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           800,000 500,000   800,000 500,000    
Potential amount to be paid if staffing levels reduced below the prescribed levels   5,900,000 3,800,000 6,100,000 3,800,000              
Fair value of the liability   $ 20,000   $ 20,000                
Expected volatility (as a percent)   30.00% 30.00% 30.00% 30.00%              
Probability of falling below a minimum staffing level within prescribed time period (as a percent)   1.00% 1.00% 1.00% 1.00%