You have to know what strike price you bought. If it was 12, you would receive the difference between that and $20, not taking into account any time premium differential. So, you have a gain of $8 notioninal or $80 per contract. The closer you get to the expiration date, the more the time decay(what someone else is willing to pay you) comes into play. If the stock is less than the option price, it would become worthless on expiration.
If they get a good uptake on sales, the sNDA, the NCE and the market stays steady or goes up, the stock could get to 20. Of course, it might be a moot point if the above happened, as by then they might have been bought.
On the otherside of things, if you believe, Marc Farber, not exactly someone to ignore, he thinks there might be a big sell-off by summer or before. He's not the only one. There was a technican on CNBC last week, who said he thought the S& P was topping and could retrace. This may be the reason why a number of stocks like AMRN or ARNA are not advancing as much as they may have 7 years ago when the market wasn't worried about the huge budget deficits and the likely cuts that will cause a slowdown in the economy.
I wish they could wave a magic wand and balance the budget, zero out the trade deficit and cut the U/E rate to 4%, but that's not going to happen, unless China goes under and takes India with it.