Need offsite employee monitoring solution

Hello all,

We're looking for a solution that would give us the ability to monitor all employees that are working from a remote site.
We know that there are multiple ways to give users access to in office server files (VPN, RDP, etc.) but we would like to also be able to see if the users are "ACTUALLY working" when off site.
Ideally we'd like to monitor the following:

-How long user is "actually" working (not just logs that have when user logs in and out).
-What documents/items the user accesses during work and for how long.
-whether the user is just idle when accessing office network.
-granularity view all user actions logging into office network.

Is there a "Magic Bullet" solution for this or is this one of those "Use multiple existing options"  scenario where we'll have to use logs from various places (VPN logs, server logs, GPO, etc.) to gather the info about whether the employee actually does work from home?

Network consists of:
-Windows server 2012 (DC, DHCP, DNS, Storage)
-30 Client computers with windows 7. 8. 8.1 and 10
-TZ-500 Firewall
-2ea 48 PoE port managed Switch.

Any recommendation is greatly appreciated!
Looking forward to your responses.

Seb