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Restructuring Activities (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Reconciliation of severance-related accrual activity
The following is a reconciliation of the severance-related accrual activity for the year ended December 31, 2018:
 
Accrued Severance and Other Employee Costs
Beginning Balance
$
2,529

Accrued restructuring expenses
—

Payments
(2,529
)
Ending Balance
$
—