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Reduction in Workforce (Tables)
3 Months Ended
Mar. 31, 2018
Restructuring and Related Activities [Abstract]  
Reduction in Workforce Liability
The table below provides a roll-forward of the reduction in workforce liability (in thousands):
Balance as of January 1, 2017
$
111

Payments
(53
)
Balance as of March 31, 2018
$
58