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Restructuring Activities
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Restructuring Activities
RESTRUCTURING ACTIVITIES

The Company continued to reduce its workforce to better align its organizational infrastructure to its revised operating plans. The Company recorded a charge of $706 in 2017 in connection with the workforce reduction. This charge included $581 related to severance and benefit continuation costs due to the suspension of all operations associated with the Fuel Conversion business segment. The Company incurred restructuring charges of $1,428 for the twelve-months ended December 31, 2016. 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