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Issuance of Common Stock and Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands					9 Months Ended
	Aug. 30, 2019	Aug. 20, 2019	Jul. 29, 2019	Nov. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Class of Stock [Line Items]
Reverse stock split, conversion ratio			0.125
No. of Warrants (in shares)					103,125
Issuance of common stock in satisfaction of indebtedness (in shares)	1,470,807
Extinguishment of long-term debt	$ 7,000			$ 48,700	$ 7,000	$ 0
American Electric
Class of Stock [Line Items]
Percentage of combined company owned by former holders			90.00%
Acquiree interest in combined company			10.00%
Series A Preferred Stock
Class of Stock [Line Items]
Series A Convertible Preferred Stock converted to common stock			$ 5,000
Common Stock
Class of Stock [Line Items]
Common stock, shares issued (in shares)			14,644,842
LNG Investments | Common Stock
Class of Stock [Line Items]
Common stock, shares issued (in shares)			12,564,733
AEGIS NG LLC | Common Stock
Class of Stock [Line Items]
Common stock, shares issued (in shares)			614,017
Diversenergy, LLC
Class of Stock [Line Items]
Value of shares issued as partial consideration in acquisition		$ 3,000
Diversenergy, LLC | Common Stock
Class of Stock [Line Items]
Number of shares of the combined company (in shares)		684,963
Warrant, May 22, 2020 Expiration
Class of Stock [Line Items]
No. of Warrants (in shares)					15,625
Exercise Price (usd per share)					$ 21.76
Warrant, May 23, 2020 Expiration
Class of Stock [Line Items]
No. of Warrants (in shares)					25,000
Exercise Price (usd per share)					$ 25.36
Warrant, November 13, 2022 Expiration
Class of Stock [Line Items]
No. of Warrants (in shares)					62,500
Exercise Price (usd per share)					$ 18.08

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