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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Measurements [Abstract]  
Summary of assets measured at fair value on a recurring basis
                                 
    Fair Value Measurements  

Description

  Balance
June  30,
2013
    (In thousands)
Quoted Prices
in Active
Markets for
Identical
Assets

(Level 1)
    Significant
Other
Observable
Inputs
(Level 2)
    Significant
Unobservable
Inputs
(Level 3)
 

Cash and cash equivalents

  $ 1,693     $ 1,365     $ 328     $ —    
   

 

 

   

 

 

   

 

 

   

 

 

 

Short-term investments:

                               

Certificates of deposit

  $ 245     $ —       $ 245     $ —    

U.S. treasury and agencies

    766       —         766       —    
   

 

 

   

 

 

   

 

 

   

 

 

 

Total

  $ 1,011     $ —       $ 1,011     $ —