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Shareholders' Equity (Details) $ / shares in Units, $ in Millions | Aug. 29, 2016 USD ($) $ / shares shares | Dec. 31, 2017 Vote $ / shares shares | Dec. 31, 2016 $ / shares shares
--- | --- | --- | ---
Preferred Stock [Abstract] |  |  |
Preferred stock, shares authorized (in shares) |  | 5,000,000 | 5,000,000
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0 | $ 0
Preferred stock, shares issued (in shares) |  | 0 | 0
Preferred stock, shares outstanding (in shares) |  | 0 | 0
Common Stock [Abstract] |  |  |
Common stock, shares authorized (in shares) |  | 50,000,000 | 50,000,000
Common shares, par value (in dollars per share) | $ / shares |  | $ 0 | $ 0
Number of votes for each share | Vote |  | 1 |
Issuance of Common Stock and Warrants [Abstract] |  |  |
Issuance of separable units (in shares) | 3,246,153 |  |
Number of common shares available in each separable unit (in shares) | 1 |  |
Number of warrants to purchase stock in each separable unit (in shares) | 1 |  |
Number of common shares callable by each warrant (in shares) | 1 |  |
Separable units, exercise price (in dollars per share) | $ / shares | $ 3.25 |  |
Percentage of ownership interest | 51.20% |  |
Proceeds from sale of stock | $ | $ 9.8 |  |

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- Definition Face amount per share of no-par value common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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