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Balance Sheet Information (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Total available-for-sale securities          
Amortized Cost $ 222,823,000   $ 222,823,000   $ 281,489,000
Gains in Accumulated Other Comprehensive Income 136,000   136,000   86,000
Losses in Accumulated Other Comprehensive Income (5,000)   (5,000)   (37,000)
Estimated Fair Value 222,954,000   222,954,000   281,538,000
Short-term investments, unrealized loss position fair value          
Less than 12 months, fair value 22,227,000   22,227,000   66,722,000
Short-term investments, gross unrealized loss          
Less than 12 months, gross unrealized loss (5,000)   (5,000)   (37,000)
Proceeds from sales and maturities of available-for-sale securities 94,800,000 150,500,000 216,100,000 422,900,000  
Gross realized gains on available-for-sale securities       100,000  
Estimated fair value of contractual maturities of available-for-sale securities          
Due in one year or less 135,948,000   135,948,000    
Due in 1-2 years 87,006,000   87,006,000    
Total available-for-sale securities 222,954,000   222,954,000   281,538,000
U.S. treasuries
          
Total available-for-sale securities          
Amortized Cost 90,523,000   90,523,000   130,956,000
Gains in Accumulated Other Comprehensive Income 35,000   35,000   22,000
Losses in Accumulated Other Comprehensive Income (1,000)   (1,000)   (1,000)
Estimated Fair Value 90,557,000   90,557,000   130,977,000
Short-term investments, unrealized loss position fair value          
Less than 12 months, fair value 15,006,000   15,006,000   29,068,000
Short-term investments, gross unrealized loss          
Less than 12 months, gross unrealized loss (1,000)   (1,000)   (1,000)
Corporate debt
          
Total available-for-sale securities          
Amortized Cost 69,109,000   69,109,000   77,582,000
Gains in Accumulated Other Comprehensive Income 93,000   93,000   55,000
Losses in Accumulated Other Comprehensive Income (4,000)   (4,000)   (36,000)
Estimated Fair Value 69,198,000   69,198,000   77,601,000
Short-term investments, unrealized loss position fair value          
Less than 12 months, fair value 7,221,000   7,221,000   37,654,000
Short-term investments, gross unrealized loss          
Less than 12 months, gross unrealized loss (4,000)   (4,000)   (36,000)
Government agency securities
          
Total available-for-sale securities          
Amortized Cost 63,191,000   63,191,000   61,004,000
Gains in Accumulated Other Comprehensive Income 8,000   8,000   9,000
Estimated Fair Value 63,199,000   63,199,000   61,013,000
Commercial paper
          
Total available-for-sale securities          
Amortized Cost         11,947,000
Estimated Fair Value         $ 11,947,000