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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Accrued compensation expenses $ 4,966 $ 6,120
Accrued other 3,092 2,990
Total accrued liabilities $ 8,058 $ 9,110