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Shareholders' Equity, 2016 Warrants and New Warrants (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 21, 2017 USD ($) Investor Form $ / shares shares | Feb. 17, 2017 USD ($) Investor $ / shares shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Proceeds from exercise of warrants | $ |  |  | $ 4,074 | $ 0 | $ 0
Warrant exercise agreement, number of forms | Form | 3 |  |  |  |
Warrants issued (in shares) |  |  | 2,779,221 |  |
Warrants outstanding (in shares) |  |  | 2,779,221 |  |
2016 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of common stock shares called by warrants (in shares) |  | 625,000 |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  | $ 3.25 |  |  |
Warrant exercise period |  |  | 5 years |  |
Proceeds from exercise of warrants | $ |  | $ 2,000 |  |  |
New Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Warrant exercise period |  |  | 5 years |  |
Noncash charge to shareholder expense included in general and administrative expenses | $ |  | $ 1,100 |  |  |
New Warrants [Member] | Investors Group [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of common stock shares called by warrants (in shares) |  | 200,000 |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  | $ 5.50 |  |  |
New Warrants [Member] | Investor [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of warrant holders | Investor |  | 1 |  |  |
Number of common stock shares called by warrants (in shares) |  | 212,500 |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  | $ 3.25 |  |  |
First Form - 2016 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of warrant holders | Investor | 2 |  |  |  |
Number of common stock shares called by warrants (in shares) | 226,923 |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares | $ 3.25 |  |  |  |
Warrant exercise period |  |  | 5 years |  |
First Form - July 2017 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of common stock shares called by warrants (in shares) | 226,923 |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares | $ 5.50 |  |  |  |
Warrant exercise period |  |  | 5 years |  |
Second Form - 2016 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of warrant holders | Investor | 1 |  |  |  |
Number of common stock shares called by warrants (in shares) | 540,000 |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares | $ 3.25 |  |  |  |
Warrant exercise period |  |  | 5 years |  |
Second Form - July 2017 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of common stock shares called by warrants (in shares) | 270,000 |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares | $ 3.25 |  |  |  |
Warrant exercise period |  |  | 5 years |  |
Third Form - 2016 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of warrant holders | Investor | 1 |  |  |  |
Number of common stock shares called by warrants (in shares) | 1,000,000 |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares | $ 3.25 |  |  |  |
Warrant exercise period |  |  | 2 years |  |
Third Form Part 1 - July 2017 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of common stock shares called by warrants (in shares) | 500,000 |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares | $ 5.50 |  |  |  |
Warrant exercise period |  |  | 2 years |  |
Third Form Part 2 - July 2017 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of common stock shares called by warrants (in shares) | 500,000 |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares | $ 3.25 |  |  |  |
Warrant exercise period |  |  | 2 years |  |
July 2017 Warrants [Member] |  |  |  |  |
2016 Warrants and New Warrants [Abstract] |  |  |  |  |
Number of common stock shares called by warrants (in shares) | 1,496,923 |  |  |  |
Warrant exercise period |  |  | 5 years |  |
Proceeds from exercise of warrants | $ | $ 5,740 |  |  |  |
Noncash charge to shareholder expense included in general and administrative expenses | $ | $ 3,000 |  |  |  |
Weighted average price (in dollars per share) | $ / shares | $ 4.34 |  |  |  |

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- Definition Refers to term of warrants to exercise, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average price per share or per unit of warrants or rights outstanding. + References No definition available. + Details
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- Definition The fair value of the warrants, determined using the Black-Scholes option pricing model, recognized as noncash charge to shareholder expense included in general and administrative expenses and a corresponding increase to equity. + References No definition available. + Details
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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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- Definition Number 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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