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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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