Basis of Presentation (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]
Royalty percentage of gross profit on licensed products	50.00%
Capitalized software development cost	$ 909

Royalty percentage of gross profit on licensed products.

No definition available.

Name:	isns_RoyaltyPercentageOfGrossProfitOnLicensedProducts
Namespace Prefix:	isns_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration