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FAIR VALUE ACCOUNTING (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets:      
Short-term investments   $ 3,933  
Marketable equity securities 486 1,480 4,576
Recurring | Total
      
Assets:      
Cash and cash equivalents 23,398 13,416  
Short-term investments   3,933  
Marketable equity securities 486 1,480  
Assets 23,884 18,829  
Liabilities:      
Accounts payable and accrued liabilities 8,223 5,612  
Recurring | Level 1
      
Assets:      
Cash and cash equivalents 23,398 13,416  
Short-term investments   3,933  
Marketable equity securities 447 897  
Assets 23,845 18,246  
Liabilities:      
Accounts payable and accrued liabilities 8,223 5,612  
Recurring | Level 2
      
Assets:      
Marketable equity securities 39 583  
Assets $ 39 $ 583