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Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Accrued Expenses and Other Current Liabilities |  |
Salaries, benefits and incentive compensation | $ 54 | $ 43
Professional fees | 0 | 0
Other | 8 | 47
Total accrued expenses and other current liabilities | $ 62 | $ 90

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