NOTE 4 — Loss Per Share

Basic loss per share is computed by dividing net loss by the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share is computed by dividing net loss by the weighted average number of shares of common stock and dilutive common stock equivalents outstanding. Given that the Company is in a loss position for each of the periods presented, there is no difference between basic and diluted net loss per share since the effect of common stock equivalents would be anti-dilutive and, therefore, they are excluded from the diluted net loss per share calculation.

The following table presents information necessary to calculate loss per share for the three and nine month periods ended September 30, 2015 and 2014 (in thousands, except per share amounts):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014

Net loss	$	(6,605)	$	(7,551)	$	(22,921)	$	(25,088)
Weighted average common shares outstanding		24,318		23,347		24,291		23,162
Basic and diluted loss per share	$	(0.27)	$	(0.32)	$	(0.94)	$	(1.08)

Potential common stock of 3,199,147 and 3,191,426 common shares underlying stock options and warrants for the periods ended September 30, 2015 and 2014, respectively, were excluded from the above calculation of diluted loss per share because they were anti-dilutive. Other potential common stock at September 30, 2015 includes Series A Warrants to purchase 2,502 shares of our common stock at an exercise price of $0.01 and Series B Warrants to purchase 429,704 shares of our common stock at an exercise price of $2.49 issued in our February 8, 2011 public offering. Other potential common stock at September 30, 2014 includes Series A Warrants to purchase 314,614 shares of our common stock at an exercise price of $0.01 and Series B Warrants to purchase 429,704 shares of our common stock at an exercise price of $2.49 issued in our February 8, 2011 public offering.