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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Presentation of fair value of financial assets using the inputs
The fair value of these financial assets was determined using the following inputs at June 30, 2013 and December 31, 2012 (in thousands):
 
 
Fair Value Measurements at Reporting Date Using
 
 
 
Quoted Prices in
Active Markets
for Identical
Assets
 
Significant
Other
Observable
Inputs
 
Significant
Unobservable
Inputs
 
Total
 
(Level 1)
 
(Level 2)
 
(Level 3)
Balance at June 30, 2013
 
 
 
 
 
 
 
Money market funds
$
16,211

 
$
16,211

 
$

 
$

Total
$
16,211

 
$
16,211

 
$

 
$

Balance at December 31, 2012
 
 
 
 
 
 
 
Money market funds
$
13,866

 
$
13,866

 
$

 
$

Total
$
13,866

 
$
13,866

 
$

 
$