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Intangibles and Other Assets - Schedule of Intangibles and Other Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Intangibles And Other Assets [Abstract]
Purchased patents and other purchased intangible assets	$ 4,605us-gaap_FiniteLivedIntangibleAssetsGross	$ 5,731us-gaap_FiniteLivedIntangibleAssetsGross
Other assets	265us-gaap_OtherAssets	289us-gaap_OtherAssets
Gross intangibles and other assets	4,870immr_IntangiblesAndOtherAssetsGross	6,020immr_IntangiblesAndOtherAssetsGross
Accumulated amortization of purchased patents and other purchased intangibles	(4,579)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	(5,639)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangibles and other assets, net	$ 291immr_IntangiblesAndOtherAssetsNet	$ 381immr_IntangiblesAndOtherAssetsNet

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- Definition

The gross aggregate carrying amounts as of the balance sheet date of intangible assets, and the gross aggregate carrying amounts as of the balance sheet date of assets not separately disclosed in the balance sheet.

+ References

No definition available.

+ Details

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Also includes aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

+ 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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 7

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