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Accrued Liabilities
9 Months Ended
Sep. 30, 2019
Payables and Accruals [Abstract]  
Accrued Liabilities ACCRUED LIABILITIES

Accrued liabilities consisted of the following (in thousands):
 
As of
 
September 30, 2019
 
December 31, 2018
Payroll and related liabilities
$
3,031

 
$
3,620

Other
4,429

 
4,750

  Total accrued liabilities
$
7,460

 
$
8,370