v3.26.1
Note 2 - Investments and Fair Value Measurement (Tables)
6 Months Ended
Jun. 30, 2026
Notes Tables  
Cash, Cash Equivalent, and Investment [Table Text Block]
   

As of June 30, 2026

 
   

Amortized Cost

   

Gross Unrealized
Gains

   

Gross Unrealized
Losses

   

Fair
Value

 

Cash and cash equivalents:

                               

Cash

  $ 355     $     $     $ 355  

Money market funds

    387                   387  

Total cash and cash equivalents

    742                   742  

Short-term investments:

                               

U.S. government agency securities

    16,334                   16,334  

Total short-term investments

    16,334                   16,334  

Total cash, cash equivalents and short-term investments

  $ 17,076     $     $     $ 17,076  
   

As of December 31, 2025

 
   

Amortized Cost

   

Gross Unrealized
Gains

   

Gross Unrealized
Losses

   

Fair
Value

 

Cash and cash equivalents:

                               

Cash

  $ 414     $     $     $ 414  

Money market funds

    2,521                   2,521  

U.S. government agency securities

    2,959                   2,959  

Total cash and cash equivalents

    5,894                   5,894  

Short-term investments:

                               

U.S. government agency securities

    14,487                   14,487  

Total short-term investments

    14,487                   14,487  

Total cash, cash equivalents and short-term investments

  $ 20,381     $     $     $ 20,381  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
   

As of June 30, 2026

 
   

Fair Value

   

Level I

   

Level II

   

Level III

 

Assets

                               

Money market funds

  $ 387     $ 387     $     $  

U.S. government agency securities

    16,334             16,334        

Total assets measured at fair value

  $ 16,721     $ 387     $ 16,334     $  
                                 

Liabilities

                               

Warrant liability

  $ 1,713     $     $     $ 1,713  

Total liabilities measured at fair value

  $ 1,713     $     $     $ 1,713  
   

As of December 31, 2025

 
   

Fair Value

   

Level I

   

Level II

   

Level III

 

Assets

                               

Money market funds

  $ 2,521     $ 2,521     $     $  

U.S. government agency securities

    17,446             17,446        

Total assets measured at fair value

  $ 19,967     $ 2,521     $ 17,446     $  
                                 

Liabilities

                               

Warrant liability

  $ 2,376     $     $     $ 2,376  

Total liabilities measured at fair value

  $ 2,376     $     $     $ 2,376  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

   

Three Months Ended June 30, 2026

     

Six Months Ended

June 30, 2026

 

Fair value—beginning of period

  $ 1,153  

  $ 2,376  

Loss (gain) on change in fair value of December 2022 Common Stock Warrants liability

    560  

    (663 )

Fair value—end of period

  $ 1,713  

  $ 1,713  

   

Three Months Ended

June 30, 2025

     

Six Months Ended

June 30, 2025

 

Fair value—beginning of period

  $ 880  

  $ 1,061  

Gain on change in fair value of December 2022 Common Stock Warrants liability

    (121 )

    (302 )

Fair value—end of period

  $ 759  

  $ 759