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://www.xbrl.org/2003/role/presentationRef
-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=96867065&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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Stock-Based Compensation - Summary of Stock Options Outstanding and Exercisable by Stock Option Plan (Details) - $ / shares	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Outstanding Stock Options, Number of Outstanding Stock Options	280,579	286,174	105,245	110,828
Outstanding Stock Options, Weighted Average Exercise Price	$ 5.39	$ 5.53	$ 18.62	$ 18.24
Exercisable Stock Options, Number of Exercisable Stock Options	91,415		105,139
Exercisable Stock Options, Weighted Average Exercise Price	$ 13.65		$ 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	973
Outstanding Stock Options, Weighted Average Exercise Price	$ 317.14
Exercisable Stock Options, Number of Exercisable Stock Options	973
Exercisable Stock Options, Weighted Average Exercise Price	$ 317.14
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	417
Exercisable Stock Options, Weighted Average Exercise Price	$ 35.88
Replacement Stock Options [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