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Discontinued Operations - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Dec. 14, 2017	Aug. 21, 2017	Aug. 20, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock, issued (in shares)	6,146,446	5,206,174
Aurora Energy Partners
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, including discontinued operation, liabilities				$ 1.2
Aurora
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling ownership percentage of subsidiary				50.00%	50.00%
Navitus Partners, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Warrant exercise price (in dollars per share)				$ 1.52
Navitus Partners, LLC \| Aurora Energy Partners
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Common stock, issued (in shares)			4,382,872
Navitus Partners, LLC \| Aurora
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling ownership percentage of subsidiary				50.00%