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Accrued Liabilities and Other (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued vacation $ 735 $ 824
Accrued paid personal leave 421 494
Accrued bonus 2,013 126
Other 1,250 366
Total $ 4,419 $ 1,810