Warrants (Detail) - Warrant activity (USD $)	9 Months Ended
	Sep. 30, 2012
Outstanding at December 31, 2011 (in Shares)	929,914
Outstanding at December 31, 2011	$ 15.13
Outstanding at December 31, 2011	$2.80 - $169.47
Warrants issued (in Shares)	50,000
Warrants issued	$ 2.26
Warrants issued	$2.09 - $3.80
Warrants expired/forfeited (in Shares)	(11,709)
Warrants expired/forfeited	$ 75.00
Warrants expired/forfeited	$ 75.00
Outstanding at September 30, 2012 (in Shares)	968,205
Outstanding at September 30, 2012	$ 13.74
Outstanding at September 30, 2012	$2.09 - $169.47
Warrants exercisable at September 30, 2012 (in Shares)	908,205
Warrants exercisable at September 30, 2012	$ 14.27
Warrants exercisable at September 30, 2012	$2.09 - $169.47