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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Payables And Accruals [Abstract] |
Accrued Liabilities | Accrued liabilities at December 31, 2018 and 2017, consisted of the following (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Accrued compensation and related costs |  | $ | 10,765 |  |  | $ | 7,372 |
Accrued professional services |  |  | 4,544 |  |  |  | 1,811 |
Accrued development costs |  |  | 1,965 |  |  |  | 794 |
Other accrued expenses |  |  | 2,526 |  |  |  | 1,735 |
Total accrued liabilities |  | $ | 19,800 |  |  | $ | 11,712 |

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