Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v2.4.0.8
Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financial assets measured at fair value on a recurring basis [Abstract]    
Available-for-sale debt securities $ 18,361  
Recurring [Member]
   
Financial assets measured at fair value on a recurring basis [Abstract]    
Cash and cash equivalents 65,183 29,576
Available-for-sale debt securities 18,361 17,043
Total 83,544 46,619
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial assets measured at fair value on a recurring basis [Abstract]    
Cash and cash equivalents 65,183 29,576
Available-for-sale debt securities 0 0
Total 65,183 29,576
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Financial assets measured at fair value on a recurring basis [Abstract]    
Cash and cash equivalents 0 0
Available-for-sale debt securities 18,361 17,043
Total 18,361 17,043
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Financial assets measured at fair value on a recurring basis [Abstract]    
Cash and cash equivalents 0 0
Available-for-sale debt securities 0 0
Total $ 0 $ 0