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Note 4 - Balance Sheet Components - Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Compensation expense $ 1,377 $ 2,932  
Controlled launch (Note 8) 0 534  
Director and officer liability insurance (Note 12) 571 0  
Clinical trial fees and costs 64 245  
Professional fees 318 85  
Warranty 50 80 $ 0
Other 215 513  
Accrued Liabilities, Current, Total $ 2,595 $ 4,389