Reportedly, there is some sort of acquisition deal reached between Invisage and Apple. A part of Invisage employees joined Apple. Another part is looking for jobs, apparently. While the deal has never been officially announced, I got unofficial confirmations of it from 3 independent sources.
Update: According to 2 sources, the deal was closed in July this year.
Somewhat old Invisage Youtube videos are still available and show the company's visible-light technology, although Invisage worked on IR sensing in more recent years:
Update #2: There are few more indications that Invisage has been acquired. Nokia Growth Partners (NGP) that participated the 2014 investing round shows Invisage in its exits list:
InterWest Partners too invested in 2014 and now lists Invisage among its non-current investments: