Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v2.4.0.8
Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities $ 13,233 $ 21,496
Fair Value, Measurements, Recurring | Total Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 13,247 21,496
Total liabilities   8
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 13,233 21,496
Total liabilities   0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 14 0
Total liabilities   8
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total assets 0 0
Total liabilities   0
Certificates of Deposit
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities 13,233 6,499
Certificates of Deposit | Fair Value, Measurements, Recurring | Total Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities 13,233 6,499
Certificates of Deposit | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities 13,233 6,499
Certificates of Deposit | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities 0 0
Certificates of Deposit | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities 0 0
US Treasury Bill Securities
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities   14,997
US Treasury Bill Securities | Fair Value, Measurements, Recurring | Total Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities   14,997
US Treasury Bill Securities | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities   14,997
US Treasury Bill Securities | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities   0
US Treasury Bill Securities | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale Securities   0
Foreign Exchange Contract | Fair Value, Measurements, Recurring | Total Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward exchange contracts assets 14  
Foreign currency forward exchange contracts liabilities   8
Foreign Exchange Contract | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets (Level 1)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward exchange contracts assets 0  
Foreign currency forward exchange contracts liabilities   0
Foreign Exchange Contract | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward exchange contracts assets 14  
Foreign currency forward exchange contracts liabilities   8
Foreign Exchange Contract | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency forward exchange contracts assets 0  
Foreign currency forward exchange contracts liabilities   $ 0