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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2021
Fair Value of Financial Instruments [Abstract]  
Assets and Liabilities Measured at Fair Value
The following table presents assets measured at fair value at March 31, 2021:

(in thousands)
 
Quoted Prices
in Active Markets
for Identical Assets
(Level 1)
  
Significant
Other Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
  
Total
 
             
Money market funds
 
$
15
  
$
-
  
$
-
  
$
15
 
Total assets
  
15
   
-
   
-
   
15
 

The following table presents assets and liabilities measured at fair value at December 31, 2020:

(in thousands)
 
Quoted Prices
in Active Markets
for Identical Assets
(Level 1)
  
Significant
Other Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
  
Total
 
             
Money market funds
 
$
435
  
$
-
  
$
-
  
$
435
 
Total assets
  
435
   
-
   
-
   
435