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Restructuring Activities (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Reconciliation of Accrual for Workforce Reduction
The following is a reconciliation of the accrual for the workforce reduction that is included within the "Accrued Liabilities" line of the consolidated balance sheets twelve-months ending December 31, 2017.

 
Twelve Months Ended
 
2017
2016
Restructuring liability at January 1,
$
309

$
—

      Amounts expensed
125

1,428

      Amounts expensed - discontinued operations
581

—

      Amounts paid
(624
)
(1,119
)
Restructuring liability at December 31,
$
391

$
309