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Note 6 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
           

Fair Value Measurements Using

 
           

Quoted Prices

   

Significant

 
           

in Active

   

Other

 
   

Balance as of

   

Markets for

   

Observable

 
   

September 30,

   

Identical Assets

   

Inputs

 
   

2022

   

(Level 1)

   

(Level 2)

 

Marketable securities

                       

US government

    46,452       46,452        

Corporate bonds

    4,406             4,406  

Commercial paper

    12,312             12,312  

Certificates of deposit

    4,055             4,055  

Total marketable securities

    67,225       46,452       20,773  
           

Fair Value Measurements Using

 
           

Quoted Prices

   

Significant

 
           

in Active

   

Other

 
   

Balance as of

   

Markets for

   

Observable

 
   

December 31,

   

Identical Assets

   

Inputs

 
   

2021

   

(Level 1)

   

(Level 2)

 

Assets:

                       

Cash equivalents

                       

Money market funds

  $ 21,402     $ 21,402     $  

Marketable securities

                       

US government

    19,307       19,307        

Corporate bonds

    8,652             8,652  

Commercial paper

    14,492             14,492  

Certificates of deposit

    3,003             3,003  

Total marketable securities

    45,454       19,307       26,147  

Total assets at fair value

  $ 66,856     $ 40,709     $ 26,147