XML 16 R24.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value Measurements (Detail Textuals) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, primarily include money market funds $ 75,418 $ 71,074 $ 114,591 $ 46,577
Corporate debt securities | Fair Value Measurement, Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value on recurring basis
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale investments 2,962 2,010    
Money market funds (included in cash and cash equivalents) | Fair Value Measurement, Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value on recurring basis
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash equivalents, primarily include money market funds $ 70,408 $ 67,050