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Accrued Liabilities | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Payables and Accruals [Abstract] |  |
Accrued Liabilities | 5. Accrued Liabilities Accrued liabilities consist of the following:
|  | March 31, 2020 |  |  | December 31, 2019 |
|  | (In thousands) |
Accrued payroll and related expenses |  | $ | 526 |  |  | $ | 1,643 |
Accrued restructuring costs (See Note 13) |  |  | 96 |  |  |  | 516 |
Accrued research and development expenses |  |  | 627 |  |  |  | 3,171 |
Other |  |  | 106 |  |  |  | 153 |
Total accrued liabilities |  | $ | 1,355 |  |  | $ | 5,483 |
| 5. Accrued Liabilities Accrued liabilities consist of the following:
|  | As of December 31, |
|  | 2019 |  |  | 2018 |
|  | (In thousands) |
Accrued payroll and related expenses |  | $ | 1,643 |  |  | $ | 1,189 |
Accrued restructuring cost (see Note 15) |  |  | 516 |  |  |  | — |
Accrued research and development expenses |  |  | 3,171 |  |  |  | 1,028 |
Other |  |  | 153 |  |  |  | 510 |
Total accrued liabilities |  | $ | 5,483 |  |  | $ | 2,727 |

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