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Prepaid Expenses and Other Current Assets
6 Months Ended
Jun. 30, 2011
Prepaid Expenses and Other Current Assets [Abstract]  
PREPAID EXPENSES AND OTHER CURRENT ASSETS
4. PREPAID EXPENSES AND OTHER CURRENT ASSETS
Prepaid expenses and other current assets consist of the following:
                 
    December 31,     June 30,  
    2010     2011  
    ($000s)  
Research and development tax credit receivable
    660       998  
Prepayments
    317       476  
Other current assets
    405       214  
 
           
Total prepaid expenses and other current assets
    1,382       1,688