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Accrued Liabilities (Tables)
3 Months Ended
Mar. 31, 2019
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities Accrued liabilities consisted of the following (in thousands):
 
As of
 
March 31, 2019
 
December 31, 2018
Payroll and related liabilities
$
3,061

 
$
3,620

Other
3,117

 
4,750

  Total accrued liabilities
$
6,178

 
$
8,370