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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued compensation expenses $ 6,409 $ 5,293
Accrued other 2,852 2,882
Total accrued liabilities $ 9,261 $ 8,175