Significant Accounting Policies and Use of Estimates (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Changes in the fair value of the company's financial liabilities
Balance at December 31, 2011	$ 4,155
Net decrease in fair value of warrant liability on remeasurement	(1,248)
Balance at June 30, 2012	$ 2,907

Net decrease in fair value of warrant liability on remeasurement.

No definition available.

Name:	insv_NetDecreaseInFairValueOfWarrantLiabilityOnRemeasurement
Namespace Prefix:	insv_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration