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Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Restricted cash held as a certificate of deposit $ 332 $ 324
Deposit held as a certificate of deposit 152 151
Total assets 484 475
Warrant liability   9,558
Contingent earnout liability   561
Total liabilities   10,119
Fair Value, Inputs, Level 1 [Member]    
Restricted cash held as a certificate of deposit 332 324
Deposit held as a certificate of deposit 152 151
Total assets 484 475
Fair Value, Inputs, Level 2 [Member]    
Restricted cash held as a certificate of deposit 0  
Deposit held as a certificate of deposit 0  
Total assets 0  
Fair Value, Inputs, Level 3 [Member]    
Restricted cash held as a certificate of deposit 0  
Deposit held as a certificate of deposit 0  
Total assets $ 0  
Warrant liability   9,558
Contingent earnout liability   561
Total liabilities   $ 10,119