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Acquisitions and Divestitures (Details Textual) - USD ($) $ in Thousands					1 Months Ended	3 Months Ended	24 Months Ended
	Feb. 01, 2019	Feb. 01, 2018	Nov. 01, 2017	Apr. 03, 2017	Sep. 29, 2017	Mar. 31, 2019	Dec. 31, 2018	Aug. 15, 2017
Acquisitions and Divestitures (Textual)
Consisting cash paid amount						$ 25,100
Borrowing Revolver Increased								$ 8,000
Old Ironsides [Member]
Acquisitions and Divestitures (Textual)
Principal amount	$ 2,000
Bearing interest of per annum						10.00%
Percentage of identifiable assets acquired and liabilities						72.76%
OIE Membership Acquisition [Member]
Acquisitions and Divestitures (Textual)
Principal amount						$ 25,100
Yorktown Energy Partners [Member] \| Class Units [Member]
Acquisitions and Divestitures (Textual)
Warrant to purchase common stock			2,940
Carbon Appalachia [Member]
Acquisitions and Divestitures (Textual)
Recognized gain based on fair value						1,300
Purchase price						5,810
Consisting cash paid amount						$ 33,000
Description of seneca acquisition				i) issued Class A Units to us, Yorktown and Old Ironsides for an aggregate cash consideration of $12.0 million, (ii) issued Class B Units to us, and (iii) issued Class C Units to us. Additionally, Carbon Appalachia Enterprises, LLC, formerly known as Carbon Tennessee Company, LLC ("Carbon Appalachia Enterprises"), a subsidiary of the Company, entered into a 4-year $100.0 million senior secured asset-based revolving credit facility with LegacyTexas Bank (the "Revolver") with an initial borrowing base of $10.0 million.
Equity commitment				$ 100,000			$ 37,000
Aggregate cash consideration								14,000
Borrowing Revolver Increased								$ 22,000
Carbon Appalachia [Member] \| Class Units [Member]
Acquisitions and Divestitures (Textual)
Acquisitions issuance shares, description					Prior to the closing of the OIE Membership Acquisition, Old Ironsides held 27,195 Class A Units, which equated to a 72.76% aggregate share ownership of Carbon Appalachia and we held (i) 9,805 Class A Units, (ii) 1,000 Class B Units and (iii) 121 Class C Units, which equated to a 27.24% aggregate share ownership of Carbon Appalachia.
Aggregate cash consideration					$ 11,000
Acquired of Class A Units							5,810
Acquired cash paid							$ 33,000
Carbon Appalachia [Member] \| Class B Units [Member]
Acquisitions and Divestitures (Textual)
Warrant to purchase common stock				1,000
Carbon Appalachia [Member] \| Yorktown Energy Partners [Member]
Acquisitions and Divestitures (Textual)
Warrant to purchase common stock				408,000
Carbon California [Member]
Acquisitions and Divestitures (Textual)
Acquisitions issuance shares, description		Yorktown exercised the California Warrant resulting in the issuance of 1,527,778 shares of our common stock in exchange for Yorktown's Class A Units of Carbon California representing approximately 46.96% of the outstanding Class A Units of Carbon California (a profits interest of approximately 38.59%). After giving effect to the exercise on February 1, 2018, we owned 56.4% of the voting and profits interests of Carbon California.