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Accrued Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2019
Payables And Accruals [Abstract] |
Accrued Liabilities | Accrued liabilities at June 30, 2019 and December 31, 2018, consisted of the following (in thousands):
|  | June 30, 2019 |  |  | December 31, 2018 |
Accrued compensation and related costs |  | $ | 8,073 |  |  | $ | 10,765 |
Accrued professional services |  |  | 4,652 |  |  |  | 4,544 |
Other accrued expenses |  |  | 3,929 |  |  |  | 4,491 |
Total accrued liabilities |  | $ | 16,654 |  |  | $ | 19,800 |

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