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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

X

- 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.

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Weighted average price per share or per unit of warrants or rights outstanding.

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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.

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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

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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

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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

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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

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
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