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Fair Value of Financial Instruments (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Item
Dec. 31, 2012
Estimated fair values of available-for-sale securities with unrealized losses    
Number of maturity groups 2  
Investments by rolling maturity, Cost    
Due within 1 year $ 32,183 $ 30,790
Due in 1-2 years 13,922 7,380
Total 46,105 38,170
Investments by rolling maturity, Unrealized Gains    
Due within 1 year 14 14
Due in 1-2 years 9 3
Total 23 17
Investments by rolling maturity, Unrealized Losses    
Due within 1 year (5) (6)
Due in 1-2 years (5)  
Total (10) (6)
Investments by rolling maturity, Fair Value    
Due within 1 year 32,192 30,798
Due in 1-2 years 13,926 7,383
Total 46,118 38,181
Short-term investments
    
Estimated fair values of available-for-sale securities with unrealized losses    
Cost 12,213 8,214
Unrealized Losses (5) (6)
Fair Value 12,208 8,208
Investments by rolling maturity, Unrealized Gains    
Total (14) (14)
Investments by rolling maturity, Unrealized Losses    
Total 5 6
Short-term investments | U.S. government debt securities
    
Estimated fair values of available-for-sale securities with unrealized losses    
Cost 5,289 2,546
Unrealized Losses (1) (2)
Fair Value 5,288 2,544
Investments by rolling maturity, Unrealized Gains    
Total (11) (6)
Investments by rolling maturity, Unrealized Losses    
Total 1 2
Short-term investments | Corporate notes
    
Estimated fair values of available-for-sale securities with unrealized losses    
Cost 3,844 5,668
Unrealized Losses (2) (4)
Fair Value 3,842 5,664
Investments by rolling maturity, Unrealized Gains    
Total (2) (8)
Investments by rolling maturity, Unrealized Losses    
Total 2 4
Short-term investments | Certificates of deposit
    
Estimated fair values of available-for-sale securities with unrealized losses    
Cost 3,080  
Unrealized Losses (2)  
Fair Value 3,078  
Investments by rolling maturity, Unrealized Gains    
Total (1)  
Investments by rolling maturity, Unrealized Losses    
Total 2  
Long-term investments
    
Estimated fair values of available-for-sale securities with unrealized losses    
Cost 3,694  
Unrealized Losses (5)  
Fair Value 3,689  
Investments by rolling maturity, Unrealized Gains    
Total (9) (3)
Investments by rolling maturity, Unrealized Losses    
Total 5  
Long-term investments | U.S. government debt securities
    
Estimated fair values of available-for-sale securities with unrealized losses    
Cost 1,253  
Fair Value 1,253  
Investments by rolling maturity, Unrealized Gains    
Total   (2)
Long-term investments | Corporate notes
    
Estimated fair values of available-for-sale securities with unrealized losses    
Cost 1,001  
Unrealized Losses (1)  
Fair Value 1,000  
Investments by rolling maturity, Unrealized Gains    
Total (9) (1)
Investments by rolling maturity, Unrealized Losses    
Total 1  
Long-term investments | Certificates of deposit
    
Estimated fair values of available-for-sale securities with unrealized losses    
Cost 1,440  
Unrealized Losses (4)  
Fair Value 1,436  
Investments by rolling maturity, Unrealized Losses    
Total $ 4