Bluebeam recently announced support of 360 Photos in Revu 2017. They include the RICOH THETA as part of their list of supported cameras.
Their primary focus is on capturing construction progress. From their site: "Utilize Capture to embed immersive panorama images into your markups to easily track construction progress."
RICOH THETA images can be added to the construction drawing by right-clicking on the drawing. In the drop-down menu, Capture -> From File...
Select your RICOH THETA image from your computer.
You can view the images by clicking on the camera icon on your construction document.
If it is a RICOH THETA image, then a 360 navigation icon will appear in the upper right corner.