Discontinued Operations	6 Months Ended
Jun. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations During the second quarter of 2017, the Company suspended all operations associated with the Fuel Conversion business segment. The components of the net assets of the Fuel Conversion discontinued operations as of June 30, 2018 and December 31, 2017 are Assets held for sale on the Consolidated Balance Sheets totaling $485 which consists primarily of certain equipment. The resulting amount in assets held for sale was determined using management's assumptions based on a plan of sale and we may not be able to realize as much value from the sale of the assets as we expect. In addition, accrued severance of $188 and $376 is included in the other accrued liabilities line of the Consolidated Balance Sheets as of June 30, 2018 and December 31, 2017, respectively. The Fuel Conversion business segment had no other assets or liabilities associated with it. The activity of the Fuel Conversion discontinued operations consisted of Research and Development, severance and other costs for the three- and six-month periods ended June 30, 2018 of $74 and $99, respectively, and for the same periods in 2017 of $1,269 and $1,999, respectively. The loss from discontinued operations in the Consolidated Statement of Operations for the three-months ended June 30, 2018 includes an impairment charge related to the Carbonite patent assets of $56 as a result of not being able to reach an agreement with a third-party to acquire or license the Carbonite technology in combination with the sale of certain equipment included in Assets held for sale. The Company intends to sell the certain equipment in Assets held for sale on a standalone basis. The Fuel Conversion business segment had no revenues associated with it. As of the date the operations were suspended, the Company incurred $581 of severance costs related to the suspension of the Fuel Conversion business segment, of which $311 ($94 and $203 was paid for the three- and six-months ended June 30, 2018) will be paid in 2018 and $65 will be paid in 2019. The Company expects to incur storage fees and other disposal costs associated with certain property, plant and equipment and contractual termination payments or other miscellaneous expenses but an estimated amount or range of amounts has not yet been determined.

Discontinued Operations

During the second quarter of 2017, the Company suspended all operations associated with the Fuel Conversion business segment. The components of the net assets of the Fuel Conversion discontinued operations as of June 30, 2018 and December 31, 2017 are Assets held for sale on the Consolidated Balance Sheets totaling $485 which consists primarily of certain equipment. The resulting amount in assets held for sale was determined using management's assumptions based on a plan of sale and we may not be able to realize as much value from the sale of the assets as we expect. In addition, accrued severance of $188 and $376 is included in the other accrued liabilities line of the Consolidated Balance Sheets as of June 30, 2018 and December 31, 2017, respectively. The Fuel Conversion business segment had no other assets or liabilities associated with it.

The activity of the Fuel Conversion discontinued operations consisted of Research and Development, severance and other costs for the three- and six-month periods ended June 30, 2018 of $74 and $99, respectively, and for the same periods in 2017 of $1,269 and $1,999, respectively. The loss from discontinued operations in the Consolidated Statement of Operations for the three-months ended June 30, 2018 includes an impairment charge related to the Carbonite patent assets of $56 as a result of not being able to reach an agreement with a third-party to acquire or license the Carbonite technology in combination with the sale of certain equipment included in Assets held for sale. The Company intends to sell the certain equipment in Assets held for sale on a standalone basis. The Fuel Conversion business segment had no revenues associated with it.

As of the date the operations were suspended, the Company incurred $581 of severance costs related to the suspension of the Fuel Conversion business segment, of which $311 ($94 and $203 was paid for the three- and six-months ended June 30, 2018) will be paid in 2018 and $65 will be paid in 2019. The Company expects to incur storage fees and other disposal costs associated with certain property, plant and equipment and contractual termination payments or other miscellaneous expenses but an estimated amount or range of amounts has not yet been determined.