Quarterly report pursuant to Section 13 or 15(d)

Stock Warrants

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Stock Warrants
6 Months Ended
Jun. 30, 2014
Warrants and Rights Note Disclosure [Abstract]  
Stock Warrants
Stock Warrants

In March 2014, in connection with the Oxford Loan Agreement, the Company issued Series KK warrants to purchase an aggregate of 391,032 shares of our common stock at an exercise price of $1.918 per share, expiring in March 2021.

At June 30, 2014, there are 4.9 million warrants outstanding to purchase our common stock. The warrants are exercisable at prices ranging from $1.918 to $3.83 per share with a weighted average exercise price of $3.27 per share.