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Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Estimate of Fair Value
 
Assets:  
Cash and cash equivalents - money market funds $ 34,998
Short term investments - bond mutual funds 15,465
Assets, Fair Value Disclosure 50,463
Quoted Prices in Active Markets for Identical Assets (Level 1)
 
Assets:  
Cash and cash equivalents - money market funds 34,998
Short term investments - bond mutual funds 15,465
Assets, Fair Value Disclosure 50,463
Significant Other Observable Inputs (Level 2)
 
Assets:  
Cash and cash equivalents - money market funds   
Short term investments - bond mutual funds   
Assets, Fair Value Disclosure   
Significant Unobservable Inputs (Level 3)
 
Assets:  
Cash and cash equivalents - money market funds   
Short term investments - bond mutual funds   
Assets, Fair Value Disclosure