Discontinued Operations (Details) - USD ($)	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale	$ 0				$ 485,000					$ 0	$ 485,000
Accrued severance					65,000						65,000
Payments for restructuring										690,000	326,000	$ 618,000
Income (loss) from discontinued operations	0	$ 18,000	$ (9,000)	$ (10,000)	$ (4,000)	$ (10,000)	$ (74,000)	$ (25,000)		(1,000)	(113,000)	(3,914,000)
Short-term lease cost										136,000
Intangible assets impairment										127,000	317,000	2,965,000
Fuel Conversion Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Severance changes											581,000
Payments for restructuring										0	0	$ 0
Carbonite
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Intangible assets impairment										56,000	$ 1,000
Discontinued Operations, Disposed of by Sale | Fuel Conversion Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration from sale	1,000									1,000
Gain on disposal										0
Short-term lease cost									$ 21,000
Accrued Liabilities [Member] | Fuel Conversion Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accrued severance	$ 0									$ 0