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Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued liabilities    
Accrued payroll and related expenses $ 6,686 $ 4,954
Accrued operating expenses 1,545 754
Other accrued expenses 975 876
Total accrued liabilities $ 9,206 $ 6,584