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Stock-Based Compensation - Summary of Stock Options Outstanding and Exercisable by Stock Option Plan (Details) - $ / shares	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Outstanding Stock Options, Number of Outstanding Stock Options	616,162	286,174	105,245	110,828
Outstanding Stock Options, Weighted Average Exercise Price	$ 3.05	$ 5.53	$ 18.62	$ 18.24
Exercisable Stock Options, Number of Exercisable Stock Options	612,162		105,139
Exercisable Stock Options, Weighted Average Exercise Price	$ 3.06		$ 18.60
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	189,581
Outstanding Stock Options, Weighted Average Exercise Price	$ 1.48
Exercisable Stock Options, Number of Exercisable Stock Options	189,581
Exercisable Stock Options, Weighted Average Exercise Price	$ 1.48
Replacement Stock Options - Alabama Graphite [Member]
Outstanding Stock Options, Number of Outstanding Stock Options	336,000
Outstanding Stock Options, Weighted Average Exercise Price	$ 1.70
Exercisable Stock Options, Number of Exercisable Stock Options	332,000
Exercisable Stock Options, Weighted Average Exercise Price	$ 1.70
Replacement Stock Options - Anatolia Energy [Member]
Outstanding Stock Options, Number of Outstanding Stock Options	85,233
Outstanding Stock Options, Weighted Average Exercise Price	$ 8.87
Exercisable Stock Options, Number of Exercisable Stock Options	85,233
Exercisable Stock Options, Weighted Average Exercise Price	$ 8.87

X

- Definition

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.

+ References

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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- Definition

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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-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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- Definition

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

+ References

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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