Regardless of the relative safety of the sold (put) strike at $15, this position is officially on the "watch" list and readers with a conservative outlook should consider exiting the play to prevent any future losses. The current price of the FEB-$15 Put is $0.15 X $0.35, so a closing order of $0.30 would likely be filled without delay. A more aggressive trader might use a "sell to cover" order on the stock (a short position in GLBC) with an initial "buy" target near the sold strike. However, be aware that the issue is heavily shorted and finding shares to sell may be difficult.
Some interesting comments on the activity in GLBC can be found here: