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Note 4 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
           

Fair Value Measurements Using

 
   

 

   

Quoted Prices

in

   

 

   

 

 
   

Balance at

   

Active

Markets

   

Significant

Other

   

Significant

Unobservable

 
   

June 30,

   

for Identical

   

Observable

   

Inputs

 
    2022    

Items

   

Inputs

   

(Level 3)

 
           

(Level 1)

   

(Level 2)

         

Assets

                               

Deposit held as a certificate of deposit

  $ 152     $ 152     $     $  

Total assets

  $ 152     $ 152     $     $  
                                 

Liabilities

                               

Warrant liability

  $     $     $     $  

Contingent earnout liability

    342                   342  

Total liabilities

  $ 342     $     $     $ 342  
           

Fair Value Measurements Using

 
   

 

   

Quoted Prices

in

   

 

   

 

 
   

Balance at

   

Active

Markets

   

Significant

Other

   

Significant

Unobservable

 
   

December 31,

   

for Identical

   

Observable

   

Inputs

 
    2021    

Items

   

Inputs

   

(Level 3)

 
           

(Level 1)

   

(Level 2)

         

Assets

                               

Restricted cash held as a certificate of deposit

  $ 324     $ 324     $     $  

Deposit held as a certificate of deposit

    151       151              

Total assets

  $ 475     $ 475     $     $  
                                 

Liabilities

                               

Warrant liability

  $ 9,558     $     $     $ 9,558  

Contingent earnout liability

    561                   561  

Total liabilities

  $ 10,119     $     $     $ 10,119  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Fair value of warrant liability at December 31, 2021

 $9,558 

Decrease in fair value of November 2021 Warrants

  (2,056

)

Reclassification of warrant liability to equity

  (7,502

)

Fair value of warrant liability at June 30, 2022

 $ 
     

Fair value of contingent liability at December 31, 2021

 $561 

Decrease in fair value of contingent liability

  (219

)

Fair value of contingent liability at June 30, 2022

 $342 

Fair value of warrant liability at December 31, 2020

 $ 

Fair value of November 2021 Warrants issued

  14,172 

Decrease in fair value of November 2021 Warrants

  (4,614

)

Fair value of warrant liability at December 31, 2021

 $9,558