It's a normal USB cable. It's a standard pin-out. Do you have a wall charger, possibly one you use for your tablet? Did you try charging the THETA from a wall charger?
You don't need to use the original cable. It's just a good-quality USB cable. I charge the THETA with a variety of standard USB cables. I occasionally run into problems with the USB connector.
For debugging purposes, I suggest testing the cable and the THETA from a wall charger first. Once you know the cable works, try charging it from the computer. Make sure that the USB port on your computer has a dark blue or light-blue insert. The one with a black insert (on the computer) may have lower amperage.