Quote:
If your battery has been completely drained, it cannot be charged via the USB cable plugged into the computer (this connection will only maintain current battery life). Use a wall charger or car charger to recharge the battery. Some computer USB ports provide a higher current than others, and
will provide more rapid charging.
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-P. 27 Sprint Moto Q User Manual
So it looks like you should be able to charge your Q as long as you have a relatively high battery level to start with, but if its low to none, it will only maintain battery life. It also could be do to the the type of USB port you are trying to use (1.1 vs 2.0).