Seven quarters of cash is ok if your burn rate is constant but of course with a probable "rollout" sitting in that same period it might seven quarters won't be enough.
You also mention they have little debt, which is great but still that doesn't explain where they could raise additional capital.
I'm not a pessimist on mnta at all, but if you look at the timing of the stock drop from the low teens since early sept I still think it got sucked into the market fray rather than any event. (I'm long Teva and Mnta).