ZetaDocs Express - No Domain/Active Directory

Good morning all,

Lovely day in glorious Brisbane :)

Just wondering if anyone knows if ZetaDocs Express will work in a situation where there is no Domain/Active Directory?

A new client of ours are suggesting the following:

1) Server setup in a hosted/virtual environment.

2) Users are offsite and will be using the NAV Web client.

3) Want to use ZetaDocs Express via the NAV Web client.

But the hosting provider is asking if a Domain Controller is required.