Stock Options and Stock-based Employee Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Stock Options and Stock-based Employee Compensation [Abstract]

Weighted-average assumptions in estimating fair value of options

The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing formula that uses weighted-average assumptions noted in the following table.

	March 31,
	2013			2012
Weighted-average expected volatility		110	%		113	%
Weighted-average expected term	4.8 years			4.8 years
Weighted-average risk-free interest rate		0.74	%		0.79	%
Expected dividends		–			–

Employee stock-based compensation

The total stock-based employee compensation for the three months ended March 31, 2013 and 2012 was as follows:

(in thousands)	Three Months Ended
	March 31,
	2013		2012
Research & Development	$	141	$	120
Selling, General & Administrative		215		278
Total	$	356	$	398