Discontinued Operations	12 Months Ended
Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	DISCONTINUED OPERATIONS During 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 in Assets held for sale (which consisted primarily of certain equipment) on the Consolidated Balance Sheets totaling $0 and $485 as of December 31, 2019 and 2018, respectively. The Company sold the remaining Fuel Conversion equipment within Assets held during the year ended December 31, 2019 for sales proceeds net of selling costs of $505, resulting in a gain on sale of $20 recorded in discontinued operations. Following the sale of the remaining Fuel Conversion equipment during 2019, the Company completed the wind-down activities associated with the Fuel Conversion business segment. The Fuel Conversion business segment had no other assets or liabilities associated with it. In addition, accrued severance of $0 and $65 is included in the other accrued liabilities line of the Consolidated Balance Sheets as of December 31, 2019 and 2018 respectively. The Company incurred $581 of severance costs relating to the suspension of the Fuel Conversion business segment, of which $205 was paid in 2017, $311was paid in 2018 and $65 was paid in 2019. The activity of the Fuel Conversion discontinued operations consisted of Research and Development, severance, an impairment charge and other costs for the years ended December 31, 2019, 2018, and 2017 of $1, $113 and $3,914, respectively. The activity of the Fuel Conversion discontinued operations consisted primarily of storage costs for holding the equipment at a third-party location totaling $21 for the year ended December 31, 2019 and the gain on sale of $20 recorded in discontinued operations. The loss from discontinued operations in the Consolidated Statement of Operations for the year ended December 31, 2018 includes an impairment charge related to the Carbonite patent assets of $56 during the second quarter of 2018 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 loss from discontinued operations in the Consolidated Statement of Operations for the year ended December 31, 2017 includes the severance charges associated with suspension of the Fuel Conversion business segment of $581. The loss from discontinued operations in the Consolidated Statement of Operations for the year ended December 31, 2017 includes an impairment charge related to the Carbonite intangible asset of $1,354 as a result of not being able to reach an agreement with a third-party to acquire or license the Carbonite technology. Absent a third-party agreement, management determined there was not adequate gross cash flows to support the carrying value of the asset and recorded the impairment charge during the fourth quarter of 2017. The Fuel Conversion business segment had no revenues associated with it.

DISCONTINUED OPERATIONS

During 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 in Assets held for sale (which consisted primarily of certain equipment) on the Consolidated Balance Sheets totaling $0 and $485 as of December 31, 2019 and 2018, respectively. The Company sold the remaining Fuel Conversion equipment within Assets held during the year ended December 31, 2019 for sales proceeds net of selling costs of $505, resulting in a gain on sale of $20 recorded in discontinued operations. Following the sale of the remaining Fuel Conversion equipment during 2019, the Company completed the wind-down activities associated with the Fuel Conversion business segment. The Fuel Conversion business segment had no other assets or liabilities associated with it.

In addition, accrued severance of $0 and $65 is included in the other accrued liabilities line of the Consolidated Balance Sheets as of December 31, 2019 and 2018 respectively. The Company incurred $581 of severance costs relating to the suspension of the Fuel Conversion business segment, of which $205 was paid in 2017, $311was paid in 2018 and $65 was paid in 2019.

The activity of the Fuel Conversion discontinued operations consisted of Research and Development, severance, an impairment charge and other costs for the years ended December 31, 2019, 2018, and 2017 of $1, $113 and $3,914, respectively. The activity of the Fuel Conversion discontinued operations consisted primarily of storage costs for holding the equipment at a third-party location totaling $21 for the year ended December 31, 2019 and the gain on sale of $20 recorded in discontinued operations. The loss from discontinued operations in the Consolidated Statement of Operations for the year ended December 31, 2018 includes an impairment charge related to the Carbonite patent assets of $56 during the second quarter of 2018 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 loss from discontinued operations in the Consolidated Statement of Operations for the year ended December 31, 2017 includes the severance charges associated with suspension of the Fuel Conversion business segment of $581. The loss from discontinued operations in the Consolidated Statement of Operations for the year ended December 31, 2017 includes an impairment charge related to the Carbonite intangible asset of $1,354 as a result of not being able to reach an agreement with a third-party to acquire or license the Carbonite technology. Absent a third-party agreement, management determined there was not adequate gross cash flows to support the carrying value of the asset and recorded the impairment charge during the fourth quarter of 2017. The Fuel Conversion business segment had no revenues associated with it.