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Accrued Liabilities (Tables) | 9 Months Ended
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Sep. 30, 2018
Payables And Accruals [Abstract] |
Accrued Liabilities | Accrued liabilities at September 30, 2018 and December 31, 2017, consisted of the following (in thousands):
|  | September 30, 2018 |  |  | December 31, 2017 |
Accrued compensation and related costs |  | $ | 8,509 |  |  | $ | 7,372 |
Accrued professional services |  |  | 3,806 |  |  |  | 1,811 |
Accrued development costs |  |  | 1,293 |  |  |  | 794 |
Other accrued expenses |  |  | 3,156 |  |  |  | 1,735 |
Total accrued liabilities |  | $ | 16,764 |  |  | $ | 11,712 |

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