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Note 4 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 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

 
  

September 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

 

$

2,827  $  $  $2,827 

Contingent earnout liability

  342         342 

Total liabilities

 $3,169  $  $  $3,169 
      

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 November 2021 Warrants liability to equity

  (7,502

)

Fair value of warrants issued in connection with the 2022 Warrant Reprice Transaction (as defined in Note 14)

  5,241 

Decrease in fair value of warrants issued in connection with the 2022 Warrant Reprice Transaction (as defined in Note 14)

  (2,414

)

Fair value of warrant liability at September 30, 2022

 $2,827 
     

Fair value of contingent liability at December 31, 2021

 $561 

Decrease in fair value of contingent liability

  (219

)

Fair value of contingent liability at September 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