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Accrued Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accrued liabilities |  |
Compensation and benefits | $ 1,709 | $ 2,641
Professional fees | 364 | 131
LNG fuel and transportation | 1,051 | 1,582
Accrued interest | 9 | 134
Contract liabilities | 402 | 185
Other taxes payable | 383 | 163
Other operating expenses | 198 | 182
Total accrued liabilities | $ 4,116 | $ 5,018

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