Share-Based Compensation (Details 3) - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Imaging Cayman [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Balance	616,000	1,225,000	1,310,000
Number of shares, Granted	0	631,000	0
Number of shares, Exercised	0	0	0
Number of shares, Forfeited	(35,000)	(1,240,000)	(85,000)
Number of shares, Balance	581,000	616,000	1,225,000	1,310,000
Number of shares, Exercisable	290,500
Weighted average exercise price, Balance	$ 0.9139	$ 1.003	$ 1.003
Weighted average exercise price, Granted	0	0.9139	0
Weighted average exercise price, Exercised	0	0	0
Weighted average exercise price, Forfeited	0.9139	1.002	1.003
Weighted average exercise price, Balance	0.9139	$ 0.9139	$ 1.003	$ 1.003
Weighted average exercise price, Exercisable	$ 0.9139
Weighted average remaining contractual term, Balance (in years)	2 years	3 years	6 months	1 year 6 months
Imaging Taiwan [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Balance	1,797,000	0
Number of shares, Granted	0	1,925,000
Number of shares, Exercised	(115,000)	0
Number of shares, Forfeited	(173,000)	(128,000)
Number of shares, Balance	1,509,000	1,797,000	0
Number of shares, Exercisable	697,000
Weighted average exercise price, Balance	$ 0.9139	$ 0
Weighted average exercise price, Granted	0	0.9139
Weighted average exercise price, Exercised	0.9139	0
Weighted average exercise price, Forfeited	0.9139	0.9139
Weighted average exercise price, Balance	0.9139	$ 0.9139	$ 0
Weighted average exercise price, Exercisable	$ 0.9139
Weighted average remaining contractual term, Balance (in years)	2 years	3 years
Himax Display Inc [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Balance	1,993,000	2,025,000	0
Number of shares, Granted	0	0	2,025,000
Number of shares, Exercised	0	0	0
Number of shares, Forfeited	(50,000)	(32,000)	0
Number of shares, Balance	1,943,000	1,993,000	2,025,000	0
Number of shares, Exercisable	971,500
Weighted average exercise price, Balance	$ 1.986	$ 1.986	$ 0
Weighted average exercise price, Granted	0	0	1.986
Weighted average exercise price, Exercised	0	0	0
Weighted average exercise price, Forfeited	1.986	1.986	0
Weighted average exercise price, Balance	1.986	$ 1.986	$ 1.986	$ 0
Weighted average exercise price, Exercisable	$ 1.986
Weighted average remaining contractual term, Balance (in years)	1 year 9 months	2 years 9 months	3 years 9 months

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.

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

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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.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Number of share options (or share units) exercised during the current period.

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