Looking at weekly chart we can observe ESPR
history, that can be summarized in 2 double tops and a rising channel
. At the moment we have broken out the channel to the upside, gaining about 30% during the past weeks. A significant level for this stock could be the 20$ area, that is the higher hight and it wasn't touched from August 2013. If you have a look to StochRSI you can observe how it's very clear on all the moves of this stock. Now we are in an overbought condition and the signal line is converging to the overbought area following a triangular pattern that will break inevitably to the downside. Probably there is still room for one more leg up to reach a possible peak on the 23-24$ area, but i'm looking for a strong retrace.
Good luck for your trading