Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Marketable Securities (Details 1)

v2.4.0.6
Fair Value Measurements and Marketable Securities (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Summary of the company's available-for-sale securities    
Available-for-sale Securities, Cost Basis $ 58,241 $ 14,409
Available-for-sale Securities, Unrealized Gain 4 2
Available-for-sale Securities, Unrealized Loss (17) (3)
Available-for-sale Securities, Fair Value, Total 58,228 14,408
Money market funds [Member]
   
Summary of the company's available-for-sale securities    
Available-for-sale Securities, Cost Basis 3,954 4,050
Available-for-sale Securities, Fair Value, Total 3,954 4,050
Certificate of Deposit [Member]
   
Summary of the company's available-for-sale securities    
Available-for-sale Securities, Cost Basis 484  
Available-for-sale Securities, Fair Value, Total 484  
Corporate bonds [Member]
   
Summary of the company's available-for-sale securities    
Available-for-sale Securities, Cost Basis 19,500 4,693
Available-for-sale Securities, Unrealized Gain 1  
Available-for-sale Securities, Unrealized Loss (13) (3)
Available-for-sale Securities, Fair Value, Total 19,488 4,690
U.S. Government Securities [Member]
   
Summary of the company's available-for-sale securities    
Available-for-sale Securities, Cost Basis 31,465 5,968
Available-for-sale Securities, Unrealized Gain 2 2
Available-for-sale Securities, Unrealized Loss (4)  
Available-for-sale Securities, Fair Value, Total 31,463 5,970
Commercial paper [Member]
   
Summary of the company's available-for-sale securities    
Available-for-sale Securities, Cost Basis 11,092 5,548
Available-for-sale Securities, Unrealized Gain 1  
Available-for-sale Securities, Fair Value, Total 11,093 5,548
Marketable securities including cash equivalents [Member]
   
Summary of the company's available-for-sale securities    
Available-for-sale Securities, Cost Basis 66,495 20,259
Available-for-sale Securities, Unrealized Gain 4 2
Available-for-sale Securities, Unrealized Loss (17) (3)
Available-for-sale Securities, Fair Value, Total 66,482 20,258
Less cash equivalents [Member]
   
Summary of the company's available-for-sale securities    
Available-for-sale Securities, Cost Basis (8,254) (5,850)
Available-for-sale Securities, Fair Value, Total $ (8,254) $ (5,850)