XML 84 R12.htm IDEA: XBRL DOCUMENT v2.4.0.6
Short-term Investments
9 Months Ended
Sep. 30, 2012
Short-term Investments

(3)    Short-term Investments

 

During the nine months ended September 30, 2012 (unaudited), we purchased commercial paper, corporate notes and bonds and U.S. government agency securities, all with maturities of less than twelve months. The following is a summary of our short-term investments (in thousands):

September 30, 2012
(Unaudited)
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair Value

Available-for-sale securities:

Commercial paper

$ 36,659 $ 1 $ (12 ) $ 36,648

Corporate notes and bonds

100,806 30 (22 ) 100,814

U.S. government agency securities

2,022 1 2,023

Total available-for-sale securities

$ 139,487 $ 32 $ (34 ) $ 139,485

 

As of September 30, 2012 (unaudited) we had certain available-for-sale securities in a gross unrealized loss position, all of which had been in such position for less than twelve months. There were no impairments considered other-than-temporary as it is more likely than not we will hold the securities until maturity or a recovery of the cost basis. The following table shows the fair values and the gross unrealized losses of these available-for-sale securities aggregated by investment category (in thousands):

September 30, 2012
(Unaudited)
Fair Value Gross Unrealized
Losses

Commercial paper

$ 34,908 $ (12 )

Corporate notes and bonds

65,782 (22 )

Total

$ 100,690 $ (34 )

 

Realized gains and losses are determined based on the specific identification method and are reported in interest and other income (expense), net in our consolidated statements of comprehensive income (loss). For the nine months ended September 30, 2012 (unaudited), gross realized gains and losses on sales of our available-for-sale securities were immaterial.