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Related Party Transactions (Details) (Sierra Partners LLC [Member], USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Sierra Partners LLC [Member]
       
Related Party Transaction [Line Items]        
Monthly retainer fee   $ 10    
Stock options issued (in shares)       90,000
Expenses from transactions with related party     94  
Total payments to related party 390 390    
Payments to related party $ 30 $ 60