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Supplementary Balance Sheet Information - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued compensation $ 1,304 $ 1,435
Preferred stock dividend 426 414
Clinical trials 1,780 1,639
Research agreements and services 1,697 726
Director fees 122 141
Professional fees and outside services 28 63
Patent, license and other fees 40 43
Other accrued liabilities 882 66
Total accrued liabilities $ 6,279 $ 4,527