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Accrued Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2019
Payables And Accruals [Abstract] |
Accrued Liabilities | Accrued liabilities at September 30, 2019 and December 31, 2018, consisted of the following (in thousands):
|  | September 30, 2019 |  |  | December 31, 2018 |
Accrued compensation and related costs |  | $ | 9,082 |  |  | $ | 10,765 |
Accrued professional services |  |  | 4,337 |  |  |  | 4,544 |
Accrued development costs |  |  | 1,804 |  |  |  | 1,965 |
Other accrued expenses |  |  | 3,226 |  |  |  | 2,526 |
Total accrued liabilities |  | $ | 18,449 |  |  | $ | 19,800 |

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