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Balance Sheet Information (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Total available-for-sale securities      
Amortized Cost $ 267,303,000   $ 281,489,000
Gains in Accumulated Other Comprehensive Income 112,000   86,000
Losses in Accumulated Other Comprehensive Income (13,000)   (37,000)
Estimated Fair Value 267,402,000   281,538,000
Short-term investments, unrealized loss position fair value      
Less than 12 months, fair value 25,916,000   66,722,000
Total, fair value 25,916,000   66,722,000
Short-term investments, gross unrealized loss      
Less than 12 months, gross unrealized loss (13,000)   (37,000)
Total, gross unrealized loss (13,000)   (37,000)
Proceeds from sales and maturities of available-for-sale securities 32,000,000 101,200,000  
Gross realized gains on available-for-sale securities 0 100,000  
Estimated fair value of contractual maturities of available-for-sale securities      
Due in one year or less 207,913,000    
Due in 1-2 years 47,621,000    
Due in 2-3 years 11,868,000    
Total available-for-sale securities 267,402,000   281,538,000
U.S. treasuries
      
Total available-for-sale securities      
Amortized Cost 130,889,000   130,956,000
Gains in Accumulated Other Comprehensive Income 25,000   22,000
Losses in Accumulated Other Comprehensive Income     (1,000)
Estimated Fair Value 130,914,000   130,977,000
Corporate debt
      
Total available-for-sale securities      
Amortized Cost 73,410,000   77,582,000
Gains in Accumulated Other Comprehensive Income 76,000   55,000
Losses in Accumulated Other Comprehensive Income (13,000)   (36,000)
Estimated Fair Value 73,473,000   77,601,000
Short-term investments, unrealized loss position fair value      
Less than 12 months, fair value 25,916,000   37,654,000
Total, fair value 25,916,000   37,654,000
Short-term investments, gross unrealized loss      
Less than 12 months, gross unrealized loss (13,000)   (36,000)
Total, gross unrealized loss (13,000)   (36,000)
Government agency securities
      
Total available-for-sale securities      
Amortized Cost 59,004,000   61,004,000
Gains in Accumulated Other Comprehensive Income 11,000   9,000
Estimated Fair Value 59,015,000   61,013,000
Commercial paper
      
Total available-for-sale securities      
Amortized Cost 4,000,000   11,947,000
Estimated Fair Value 4,000,000   11,947,000
U.S. treasuries
      
Short-term investments, unrealized loss position fair value      
Less than 12 months, fair value     29,068,000
Total, fair value     29,068,000
Short-term investments, gross unrealized loss      
Less than 12 months, gross unrealized loss     (1,000)
Total, gross unrealized loss     $ (1,000)