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Common Stock Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014
Class of Warrant or Right [Line Items] |  |  |
Warrant, shares | 469,600 |  |
Series B Preferred Stock [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Issuance of preferred stock | 0 | 480,000 |
Common Stock [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Warrants issued | 1,152,125 |  |
Warrant exercise period | 5 years |  |
Exercise price of warrant | $ 1.85 |  |
Private Placement [Member] | McDonald Partners, LLC [Member] | Series B Preferred Stock [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of shares issuable per warrant | 2.00 |  |
Issuance of preferred stock |  |  | 480,000
Private Placement [Member] | McDonald Partners, LLC [Member] | Series B Preferred Stock [Member] | Maximum [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Purchase threshold amount | $ 700 |  |
Purchase threshold shares | 28,000 |  |
Private Placement [Member] | McDonald Partners, LLC [Member] | Common Stock [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Number of shares issuable per warrant | 3.25 |  |
Private Placement [Member] | McDonald Partners, LLC [Member] | Common Stock [Member] | Minimum [Member] |  |  |
Class of Warrant or Right [Line Items] |  |  |
Purchase threshold amount | $ 700 |  |
Purchase threshold shares | 28,000 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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