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Other Long-Term Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Liabilities, Noncurrent [Abstract] |
Schedule of Other Long-Term Liabilities | Other long-term liabilities consist of the following as of December 31, 2019 and 2020 (in thousands):
| December 31, 2019 |  | December 31, 2020
Contract liabilities, net of current portion | $ | 30,925 |  |  | $ | 34,866 |
Asset retirement obligations | 1,961 |  |  | 7,647 |
Deferred payments related to acquisitions | 4,963 |  |  | 715 |
Employee separation costs | 1,838 |  |  | — |
Other | 1,764 |  |  | 2,827 |
Other long-term liabilities | $ | 41,451 |  |  | $ | 46,055 |

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