Stock Based Compensation - Summary of Stock Options Outstanding and Exercisable by Stock Option Plan (Details) - $ / shares	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Outstanding Stock Options, Number of Outstanding Stock Options	958,489	286,174	110,828
Outstanding Stock Options, Weighted Average Exercise Price	$ 1.60	$ 5.53	$ 18.24
Exercisable Stock Options, Number of Exercisable Stock Options	958,489	97,010
Exercisable Stock Options, Weighted Average Exercise Price	$ 1.60	$ 13.59
2004 Plan [Member]
Outstanding Stock Options, Number of Outstanding Stock Options	4,792
Outstanding Stock Options, Weighted Average Exercise Price	$ 35.14
Exercisable Stock Options, Number of Exercisable Stock Options	4,792
Exercisable Stock Options, Weighted Average Exercise Price	$ 35.14
2004 Directors' Plan [Member]
Outstanding Stock Options, Number of Outstanding Stock Options	556
Outstanding Stock Options, Weighted Average Exercise Price	$ 186.00
Exercisable Stock Options, Number of Exercisable Stock Options	556
Exercisable Stock Options, Weighted Average Exercise Price	$ 186.00
2013 Plan [Member]
Outstanding Stock Options, Number of Outstanding Stock Options	638,270
Outstanding Stock Options, Weighted Average Exercise Price	$ 0.71
Exercisable Stock Options, Number of Exercisable Stock Options	638,270
Exercisable Stock Options, Weighted Average Exercise Price	$ 0.71
Replacement Stock Options - Alabama Graphite [Member]
Outstanding Stock Options, Number of Outstanding Stock Options	289,600
Outstanding Stock Options, Weighted Average Exercise Price	$ 1.61
Exercisable Stock Options, Number of Exercisable Stock Options	289,600
Exercisable Stock Options, Weighted Average Exercise Price	$ 1.61
Replacement Stock Options - Anatolia Energy [Member]
Outstanding Stock Options, Number of Outstanding Stock Options	25,271
Outstanding Stock Options, Weighted Average Exercise Price	$ 13.41
Exercisable Stock Options, Number of Exercisable Stock Options	25,271
Exercisable Stock Options, Weighted Average Exercise Price	$ 13.41

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Name Accounting Standards Codification
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-SubTopic 10
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