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Note 2 - Fair Value Measurements - Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Cash and cash equivalents $ 43,035 $ 10,266
Fair Value, Recurring [Member]    
Unrealized Gain (Loss), before Tax (4) 5
Total financial assets, adjusted cost 83,833 18,972
Assets, Fair Value Disclosure 83,829 18,977
Total financial liabilities 894 26
Fair Value, Recurring [Member] | Cash and Cash Equivalents [Member]    
Assets, Fair Value Disclosure 42,531 6,965
Fair Value, Recurring [Member] | Debt Securities Available for Sale [Member]    
Assets, Fair Value Disclosure 41,298 12,012
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member]    
Cash and cash equivalents 42,531 6,965
Money market funds, fair value 42,531 6,965
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Money Market Funds [Member] | Cash and Cash Equivalents [Member]    
Money market funds, fair value 42,531 6,965
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Private Placement Warrants [Member]    
Warrants and Rights Outstanding 1 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 4,986  
Unrealized Gain (Loss), before Tax 1  
Debt Securities, Available-for-Sale 4,987  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Asset-Backed Securities [Member] | Debt Securities Available for Sale [Member]    
Debt Securities, Available-for-Sale 4,987  
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Bond Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 19,380 9,660
Unrealized Gain (Loss), before Tax (2) 4
Debt Securities, Available-for-Sale 19,378 9,664
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Bond Securities [Member] | Debt Securities Available for Sale [Member]    
Debt Securities, Available-for-Sale 19,378 9,664
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 7,453 945
Unrealized Gain (Loss), before Tax (2) 0
Debt Securities, Available-for-Sale 7,451 945
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member] | Debt Securities Available for Sale [Member]    
Debt Securities, Available-for-Sale 7,451 945
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Debt Securities [Member]    
Debt Securities, Available-for-Sale, Amortized Cost 9,483 1,402
Unrealized Gain (Loss), before Tax (1) 1
Debt Securities, Available-for-Sale 9,482 1,403
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Debt Securities [Member] | Debt Securities Available for Sale [Member]    
Debt Securities, Available-for-Sale 9,482 1,403
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Derivative Financial Instruments, Liabilities [Member]    
Derivative warrant liabilities 787 $ 26
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Convertible Note, Current [Member]    
Convertible Debt, Fair Value Disclosures $ 106