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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2014
Fair Value Measurements [Abstract]  
Fair Value Hierarchy

The following table represents the Company's fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis (in thousands):

 

Fair Value at June 30, 2014     Fair Value at December 31, 2013  
Assets Level 1     Level 2     Level 3     Level 1     Level 2     Level 3  
Auction rate security   $     $     $     $ 1,790     $     $  
Money market funds     73,069                   100,049              
Government-backed  security           18,000                          
Asset-backed securities           42,483                          
Corporate debt securities           72,467                   26,978        
Total cash equivalents and investments   $ 73,069     $ 132,950     $     $ 101,839     $ 26,978     $