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Accrued and Other Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Payables And Accruals [Abstract] |
Schedule of Accrued and Other Current Liabilities | Accrued and other current liabilities consisted of the following at December 31, 2018 and 2019 (in thousands):
|  | December 31, |  | December 31,
|  | 2018 |  | 2019
Accrued research and development |  | $ | 1,110 |  | $ | 617
Accrued legal and professional fees |  |  | 259 |  |  | 235
Other current liabilities |  |  | 363 |  |  | 678
|  | $ | 1,732 |  | $ | 1,530

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