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v2.4.1.9

Segment Reporting, Geographic Information, and Significant Customers - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Number of reporting segment | 1 us-gaap_NumberOfReportableSegments |  |
Maximum [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets outside United States of America | 10.00%immr_PercentageOfLongLivedAssetsOutsideCountry / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%immr_PercentageOfLongLivedAssetsOutsideCountry / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%immr_PercentageOfLongLivedAssetsOutsideCountry / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum [Member] | Net Revenues [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue by major customer | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum [Member] | Outstanding Accounts and Other Receivable [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Outstanding accounts and other receivable, percentage | 10.00%immr_EntityWideReceivableMajorCustomerPercentage / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Minimum [Member] | Net Revenues [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Revenue by major customer | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Minimum [Member] | Outstanding Accounts and Other Receivable [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Outstanding accounts and other receivable, percentage | 10.00%immr_EntityWideReceivableMajorCustomerPercentage / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |

X
- Definition The amount of accounts receivable from a particular customer as a percentage of entity wide accounts and other receivables. + References No definition available. + Details
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Namespace Prefix: | immr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of long-term assets that are outside of a particular country. + References No definition available. + Details
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Namespace Prefix: | immr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |