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Accrued Liabilities (Tables) | 3 Months Ended
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Mar. 31, 2019
Payables And Accruals [Abstract] |
Accrued Liabilities | Accrued liabilities at March 31, 2019 and December 31, 2018, consisted of the following (in thousands):
|  | March 31, 2019 |  |  | December 31, 2018 |
Accrued professional services |  | $ | 8,323 |  |  | $ | 4,544 |
Accrued compensation and related costs |  |  | 6,490 |  |  |  | 10,765 |
Accrued development costs |  |  | 1,908 |  |  |  | 1,965 |
Other accrued expenses |  |  | 1,676 |  |  |  | 2,526 |
Total accrued liabilities |  | $ | 18,397 |  |  | $ | 19,800 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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