Tenant decides not to move-in with Security Deposit Payment but No Lease - Colorado

[Mike Dumont]

We have an interesting scenario this week - State of Colorado.  

The tenant pays a partial amount towards the security deposit with intent on paying the remainder of on their payday.  There was not a signed lease yet as we were going to sign when full payment was made.  On signing lease day informed would not move in.   We may have a loss not being able to rent.  Don't know where this stands since they didn't sign the lease.  I tried reading Security Deposit Statutes and couldn't find anything relevant.