XML 89 R75.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Commitments - Additional Information (Detail) ft² in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 31, 2015 ft² | Feb. 28, 2015 ft²
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease expiration year | 2023 |  |  |  |
Rent expense | $ | $ 1,307 | $ 1,283 | $ 1,291 |  |
Lease agreements | Lease property one |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease facility area |  |  |  | 33 |
Lease agreements | Lease property two |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease facility area |  |  |  |  | 42

X
- Definition The last year in which a lease or group of leases is set to expire at various dates, in CCYY format. + References No definition available. + Details
Name: | immr_OperatingLeaseExpirationMaximumYear
Namespace Prefix: | immr_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References No definition available. + Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LeaseAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=immr_LeasePropertyOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=immr_LeasePropertyTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |