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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued salaries and other compensation $ 3,686 $ 2,646
Insurance 1,511 507
Deferred revenues (contract liabilities) 1,267 762
Property, sales and other taxes 2,018 2,693
Other 430 361
Accrued liabilities $ 8,912 $ 6,969