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Note 4 - Fair Value Measurements
3 Months Ended
Mar. 31, 2021
Notes to Financial Statements  
Fair Value Disclosures [Text Block]
4.
Fair Value Measurements
 
We measure our cash equivalents and restricted cash at fair value. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. A
three
-tier fair value hierarchy is established as a basis for considering such assumptions and for inputs used in the valuation methodologies in measuring fair value:
 
 
Level 
1:
Quoted prices in active markets for identical assets or liabilities.
 
Level 
2:
Directly or indirectly observable market-based inputs or unobservable inputs used in models or other valuation methodologies.
 
Level 
3:
Unobservable inputs that are
not
corroborated by market data. The inputs require significant management judgment or estimation.
 
We classify our cash equivalents and restricted cash within Level
1
or Level
2
because our cash equivalents and restricted cash are valued using quoted market prices or alternative pricing sources and models utilizing market observable inputs.
 
Assets measured at fair value on a recurring basis as of
March 31, 2021
and
December 31, 2020
are summarized below (in thousands):
 
   
March 31, 2021
   
December 31, 2020
 
   
Quoted Prices in
   
Direct or
     
 
 
 
Quoted Prices in
   
Direct or
     
 
 
   
Active Markets
   
Indirect
     
 
 
 
Active Markets
   
Indirect
     
 
 
   
for Identical
   
Observable
     
 
 
 
for Identical
   
Observable
     
 
 
   
Assets (Level 1)
   
Inputs (Level 2)
   
Total
   
Assets (Level 1)
   
Inputs (Level 2)
   
Total
 
Assets
                                               
Cash equivalents:
                                               
Money market funds
  $
6,114
    $
    $
6,114
    $
6,114
    $
    $
6,114
 
Corporate commercial paper
   
     
     
     
     
     
 
Corporate debt
   
     
     
     
     
     
 
Total cash equivalents
   
6,114
     
     
6,114
     
6,114
     
     
6,114
 
Restricted cash:
                                               
Money market funds
   
337
     
     
337
     
337
     
     
337
 
Total assets measured at fair value
  $
6,451
    $
    $
6,451
    $
6,451
    $
    $
6,451