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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Measurements [Abstract]  
Assets measured at fair value on a recurring basis
                                 
    Using        
    Quoted Prices
in Active
Markets
(Level 1)
    Significant
Other
Observable
Inputs
(Level 2)
    Significant
Unobservable
Inputs
(Level 3)
    Total Fair
Value as of
March 31, 2013
 
         

Cash Equivalents:

                               

Money market funds

  $ 13,697     $ —       $ —       $ 13,697  

Long term investments:

                               

Failed Auction Securities

    —         —         5,031       5,031  

Brokered certificates of deposit

    —         1,292       —         1,292  

Certificate of deposit

    231       —         —         231  
Quantitative information about Level 3 fair value measurements
                     
    Fair Value     Valuation
Technique
 

Unobservable

Input

  Range
(Weighted
Average)
         

Failed Auction Securities

  $ 5,031     Discounted cash flow   Cumulative probability of earning the maximum rate until maturity   0.01% - 0.11%

(0.06%)

                Cumulative probability of principal return prior to maturity   84.33% - 94.94%

(89.55%)

                Cumulative probability of default   5.05% - 15.56%

(10.39%)

                Liquidity risk premium   5.00% - 5.00%

(5.00%)

                Recovery rate in default   40.00% - 40.00%

(40.00%)

Change in the estimated fair values calculated for those assets valued on a recurring basis utilizing Level 3 inputs
         

Balance at the beginning of the period

  $ 4,979  

Credit gain on available-for-sale securities included in Other income (expense), net

    1  

Unrealized gain included in Other comprehensive income (loss)

    51  
   

 

 

 

Balance at the end of the period

  $ 5,031