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Note H - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
    Balance as of September 30, 2022     Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)  

Deerfield Warrant liability

  $ 30     $     $     $ 30  

Embedded Warrant Put Option

    4                   4  

KVK Warrant liability

    1             1        

Total liabilities

  $ 35     $     $ 1     $ 34  
                               

Securities:

                               

U.S. government-sponsored agency securities

  $ 7,171     $     $ 7,171     $  

Certificates of deposit

    20,475       20,475              

U.S. Treasury securities

    9,649       9,649              

Total assets

  $ 37,295     $ 30,124     $ 7,171     $  
    Balance as of December 31, 2021     Quoted Prices in Active Markets for Identical Assets (Level 1)     Significant Other Observable Inputs (Level 2)     Significant Unobservable Inputs (Level 3)  

Deerfield Warrant liability

  $ 288     $     $     $ 288  

Embedded Warrant Put Option

    18                   18  

KVK Warrant liability

    24             24        

Total liabilities

  $ 330     $     $ 24     $ 306  
                                 

Securities:

                               

U.S. government-sponsored agency securities

  $ 4,997     $     $ 4,997     $  

Certificates of deposit

    490       490              

U.S. Treasury securities

    9,935       9,935              

Total assets

  $ 15,422     $ 10,425     $ 4,997     $  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
   

Three months ended September 30,

   

Nine months ended September 30,

 
   

2022

   

2021

   

2022

   

2021

 

Balance as of beginning of period

  $ 56     $ 666     $ 306     $ 255  

Adjustment to fair value

    (22 )     (305 )     (272 )     106  

Balance as of end of period

  $ 34     $ 361     $ 34     $ 361