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Short-Term Investments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Components of the Company's short-term investments  
Amortized Cost $ 2,750
Unrealized Gains   
Unrealized Losses   
Estimated Fair Value   
Certificates of deposit [Member]
 
Components of the Company's short-term investments  
Amortized Cost 2,750
Unrealized Gains   
Unrealized Losses   
Estimated Fair Value