Subsequent Events (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended						1 Months Ended		1 Months Ended
	May 07, 2013 Subsequent Event [Member]	May 07, 2013 Prefunded Warrants [Member] Subsequent Event [Member]	May 07, 2013 Warrants Two [Member] Subsequent Event [Member]	May 07, 2013 Prefunded Warrants and Warrants Two [Member] Subsequent Event [Member]	May 22, 2013 Pillar I Warrants [Member] Subsequent Event [Member]	Apr. 22, 2013 Pillar I Warrants [Member] Subsequent Event [Member]	Apr. 30, 2013 Additional Pillar Warrants [Member]	Apr. 30, 2013 Additional Pillar Warrants [Member] Subsequent Event [Member]	Apr. 30, 2013 April 2013 Pillar Agreements [Member] Agreement	Apr. 30, 2013 Series D Preferred Stock [Member] April 2013 Pillar Agreements [Member] Subsequent Event [Member]	Apr. 30, 2013 Series E Preferred Stock [Member] April 2013 Pillar Agreements [Member]
Subsequent Events (Textual) [Abstract]
Common stock and warrants sold	17,500,000
Shares of common stock that may be purchased upon exercise of the warrants	17,500,000	15,816,327	15,816,327			1,000,000		1,000,000
Price per share of (a) common stock and warrants or (b) prefunded warrants and warrants	$ 0.50			$ 0.49
Gross proceeds from sale of common stock and warrants excluding the proceeds from future exercise of the warrants, if any	$ 16.5
Estimated net proceeds from sale of common stock and warrants excluding the proceeds from future exercise of the warrants, if any	$ 14.7
Exercise price of warrants to purchase common stock	0.47	0.01	0.47			0.61		0.79
Warrants exercisable period	5 years	7 years	5 years		5 years
Redemption price of warrants	0.01	0.01	0.01	0.01	0.01
Prior notice to holder for closing price of the common stock	30 days	30 days	30 days		30 days
Minimum trading days considered to redeem warrants	20 days	20 days	20 days		20 days
Minimum closing price to redeem the warrants	2.80	2.80	2.80			2.80
Number of agreement									2
Unaffiliated ownership % that would trigger the right to require the Company to repurchase the Series D preferred stock										66.67%
Percentage of preferred stock holders waived right to receive specified amount in liquidation											100.00%
Final exercise date of warrant							Jun. 01, 2014