Short answers, pulled from the story.
Double Helix Games received its official name in March 2008 following the merger of Shiny Entertainment and The Collective. This branding change coincided with the completion of their physical relocation to offices in Irvine, California on the 9th of October 2007.
Retail giant Amazon purchased Double Helix Games on the 5th of February 2014. The acquisition integrated the studio into the Irvine location of Amazon Game Studios which had been established two years prior in 2012.
Silent Hill: Homecoming launched in 2008 as one of the first major titles from the merged entity across Microsoft Windows PlayStation 3 and Xbox 360 platforms. Electronic Arts released G.I. Joe: The Rise of Cobra the following year while Square Enix backed Front Mission Evolved in 2010.
Foundation 9 Entertainment initiated a round of consolidations that resulted in an undisclosed number of staff cuts for Double Helix Games during July 2009. The workforce shrank significantly even though the company had previously guaranteed stability against job losses.
Microsoft Studios served as the publisher for the Killer Instinct project during development when Amazon acquired Double Helix Games in February 2014. Season 1 of Killer Instinct eventually released on Xbox One despite the ownership shift.