6. COMMON STOCK AND WARRANTS (Tables)

12 Months Ended

Dec. 31, 2012

Common Stock And Warrants

Warrant activity

Warrant Summary – The following table summarizes warrant activity for the years ended December 31, 2012 and 2011 (number of shares in thousands):

	Number of Shares			Price per Share	Weighted Average Exercise Price
Balance at December 31, 2010		258		$1.80 – $745.50	$	183.00
Warrants issued		330		$22.50	$	22.50
Warrants exercised		(162	)	$6.75	$	6.75
Balance at December 31, 2011		426		$1.80 – $745.50	$	117.60
Warrants issued		4,633		$6.45 –  $8.85	$	2.85
Warrants exercised		(20	)	$1.80 –  $7.95	$	7.80
Balance at December 31, 2012		5,039		$1.80 – $745.50	$	17.10