Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments (Details)

v2.4.0.6
Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Composition of financial instruments    
Amortized cost $ 72,167 $ 72,102
Gross unrealized gains 11 10
Gross unrealized losses (17) (30)
Fair value 72,161 72,082
Money market funds [Member]
   
Composition of financial instruments    
Amortized cost 378 14,372
Gross unrealized gains     
Gross unrealized losses     
Fair value 378 14,372
Cash and cash equivalents [Member]
   
Composition of financial instruments    
Amortized cost (378) (14,372)
Gross unrealized gains     
Gross unrealized losses     
Fair value (378) (14,372)
Investments [Member]
   
Composition of financial instruments    
Amortized cost 71,789 57,730
Gross unrealized gains 11 10
Gross unrealized losses (17) (30)
Fair value 71,783 57,710
Corporate debt securities [Member]
   
Composition of financial instruments    
Amortized cost 59,789 41,764
Gross unrealized gains 10 7
Gross unrealized losses (16) (30)
Fair value 59,783 41,741
Government debt securities [Member]
   
Composition of financial instruments    
Amortized cost 12,000 15,966
Gross unrealized gains 1 3
Gross unrealized losses (1)  
Fair value $ 12,000 $ 15,969