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Stock Based Compensation - Summary of Stock Options Outstanding and Exercisable by Stock Option Plan (Details) - $ / shares | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Outstanding Stock Options, Number of Options Outstanding | 286,174 | 110,828 | 326,424
Outstanding Stock Options, Weighted Average Exercise Price | $ 5.53 | $ 18.24 | $ 24.89
Exercisable Stock Options Exercisable, Number of Options Exercisable | 97,010 | 110,723 |
Exercisable Stock Options Exercisable, Weighted Average Exercise Price | $ 13.59 | $ 18.22 |
2004 Plan [Member] |  |  |
Outstanding Stock Options, Number of Options Outstanding | 4,792 |  |
Outstanding Stock Options, Weighted Average Exercise Price | $ 35.14 |  |
Exercisable Stock Options Exercisable, Number of Options Exercisable | 4,792 |  |
Exercisable Stock Options Exercisable, Weighted Average Exercise Price | $ 35.14 |  |
2004 Director's Plan [Member] |  |  |
Outstanding Stock Options, Number of Options Outstanding | 973 |  |
Outstanding Stock Options, Weighted Average Exercise Price | $ 317.14 |  |
Exercisable Stock Options Exercisable, Number of Options Exercisable | 973 |  |
Exercisable Stock Options Exercisable, Weighted Average Exercise Price | $ 317.14 |  |
2013 Plan [Member] |  |  |
Outstanding Stock Options, Number of Options Outstanding | 189,581 |  |
Outstanding Stock Options, Weighted Average Exercise Price | $ 1.48 |  |
Exercisable Stock Options Exercisable, Number of Options Exercisable | 417 |  |
Exercisable Stock Options Exercisable, Weighted Average Exercise Price | $ 35.88 |  |
Replacement Stock Options [Member] |  |  |
Outstanding Stock Options, Number of Options Outstanding | 90,828 |  |
Outstanding Stock Options, Weighted Average Exercise Price | $ 9.09 |  |
Exercisable Stock Options Exercisable, Number of Options Exercisable | 90,828 |  |
Exercisable Stock Options Exercisable, Weighted Average Exercise Price | $ 9.09 |  |

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- 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://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 + Details
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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 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 + Details
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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 + Details
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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 + Details
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