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Restructuring Activities (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Summary of the Accrual Balance and Utilization of Restructuring
The following table summarizes the accrual balance and utilization for the year ended December 31, 2018 (in thousands):

Employee separation costs
Restructuring accruals - December 31, 2017
$
—

Restructuring expenses
660

Cash payments
—

Restructuring accruals - December 31, 2018
$
660