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Note 3 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Fair Value Measurements at

 
  

June 30, 2023

 
  (unaudited) 
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets

                

Money market funds

 $17,596  $17,596  $  $ 

Liabilities

                

Warrant liability

 $30,496  $  $  $30,496 
  

Fair Value Measurements at

 
  

December 31, 2022

 
  

Total

  

Level 1

  

Level 2

  

Level 3

 

Assets

                

Money market funds

 $52,905  $52,905  $  $ 

Liabilities

                

Warrant liability

 $26,881  $  $  $26,881 
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
  

October 2022 Warrants

 
  

June 30, 2023

  

December 31, 2022

 

Expected term (in years)

  1.4   1.9 

Expected volatility

  82.9%  49.9%

Risk-free interest rate

  5.14%  4.48%

Expected dividend yield

  0.00%  0.00%

Fair value of common share

 $1.26  $1.25 

Exercise price

 $0.7949  $0.7949 
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
  

October 2022 Warrants

 

Balance at December 31, 2022

 $26,881 

Change in fair value

  33,207 

Balance at March 31, 2023

  60,088 

Change in fair value

  (29,592)

Balance at June 30, 2023

 $30,496