Net Income Per Share - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Options to purchase shares of common stock	1,400,000	1,400,000
Exercise prices greater than the average fair market value of stock	$ 11.21	$ 7.84

Exercise prices for options to purchase shares of common stock that are greater than the fair market value of the Company's stock that were not included in the earnings per share calculation because the effect would have been anti-dilutive.

No definition available.

Name:	immr_ExercisePricesGreaterThanAverageFairMarketValueOfStock
Namespace Prefix:	immr_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration