v3.26.1
Note 2 - Investments and Fair Value Measurement (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Cash, Cash Equivalent, and Investment [Table Text Block]
   

As of March 31, 2026

 
   

Amortized Cost

   

Gross Unrealized
Gains

   

Gross Unrealized
Losses

   

Fair
Value

 

Cash and cash equivalents:

                               

Cash

  $ 563     $     $     $ 563  

Money market funds

    893                   893  

U.S. government agency securities

    2,367                   2,367  

Total cash and cash equivalents

    3,823                   3,823  

Short-term investments:

                               

U.S. government agency securities

    17,285                   17,285  

Total short-term investments

    17,285                   17,285  

Total cash, cash equivalents and short-term investments

  $ 21,108     $     $     $ 21,108  
   

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 March 31, 2026

 
   

Fair Value

   

Level I

   

Level II

   

Level III

 

Assets

                               

Money market funds

  $ 893     $ 893     $     $  

U.S. government agency securities

    19,652             19,652        

Total assets measured at fair value

  $ 20,545     $ 893     $ 19,652     $  

Liabilities

                               

Warrant liability

  $ 1,153     $     $     $ 1,153  

Total liabilities measured at fair value

  $ 1,153     $     $     $ 1,153  
   

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

March 31, 2026

     

Three Months Ended

March 31, 2025

 

Fair value—beginning of period

  $ 2,376  

  $ 1,061  

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

    (1,223

)

    (181 )

Fair value—end of period

  $ 1,153  

  $ 880