Contingencies - Additional Information (Detail)	3 Months Ended
Mar. 31, 2014 Additional_Class_Action
Commitments And Contingencies Disclosure [Abstract]
Number of additional class action complaints filed	4
Number of additional class action complaints voluntarily dismissed	1

The number of additional class action complaints voluntarily dismissed for certain litigation.

No definition available.

Name:	immr_NumberOfAdditionalClassActionComplaintsVoluntarilyDismissed
Namespace Prefix:	immr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration