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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Payables And Accruals [Abstract] |
Summary of 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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