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Supplementary Balance Sheet Information - Accrued Expenses (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Accrued compensation | $ 1,849 | $ 1,435
Preferred stock dividend(1) | 0 | 414
Clinical trials | 2,333 | 1,639
Clinical trials | 509 | 726
Director fees | 125 | 141
Patent, license and other fees | 24 | 43
Other accrued liabilities | 337 | 129
Total accrued liabilities | $ 5,177 | $ 4,527

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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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