The following table summarizes information with respect to outstanding warrants to purchase common stock of the Company at March 31, 2014: 

 

Exercise			Number			Expiration
Price			Outstanding			Date
$	4.25			1,181,384		August 2018
	12.00			456,009		December 2017 to February 2018
	20.00			14,538		January 2015
	25.00			354,229		January 2017 to February 2019
				2,006,160

 

During the three months ended March 31, 2014, the Company issued an aggregate of 1,119,746 shares of its common stock upon the exercise of warrants at $4.25 per share.