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Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Contingent earnout liability $ 342 $ 561
Fair Value, Recurring [Member]    
Deposit held as a certificate of deposit 152 151
Total assets 152 475
Contingent earnout liability 342 561
Total liabilities 342 10,119
Restricted cash held as a certificate of deposit   324
Warrant liability   9,558
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Deposit held as a certificate of deposit 152 151
Total assets 152 475
Restricted cash held as a certificate of deposit   324
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Contingent earnout liability 342 561
Total liabilities $ 342 10,119
Warrant liability   $ 9,558