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Reduction in Workforce (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Schedule of Reduction Workforce Liability
The table below provides a roll-forward of the reduction in workforce liability (in thousands):
 
 
 
 
 
Balance as of January 1, 2017
$
31

 
Charges
170

 
Payments
(90
)
 
Balance as of December 31, 2017
$
111