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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Payables And Accruals [Abstract] |
Accrued Liabilities | Accrued liabilities at December 31, 2020 and December 31, 2019, consisted of the following (in thousands):
|  | December 31, 2020 |  |  | December 31, 2019 |
Accrued compensation and related costs |  | $ | 15,999 |  |  | $ | 12,703 |
Accrued professional services |  |  | 3,020 |  |  |  | 3,489 |
Other accrued expenses |  |  | 5,734 |  |  |  | 4,759 |
Total accrued liabilities |  | $ | 24,753 |  |  | $ | 20,951 |

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