I'm no accountant, but have written off crappy investments before, and I just wrote off the entire price you paid for the stock, and declared it a total loss. That way you still have your shares in case something does happen, but your cost basis will be zero. You can write off a maximum of $3K/year. I would've started writing this one off this year, but got schooled in leveraged ETF's earlier this year that got me my capital losses for this year.
Good Luck