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