Stock Authorization And Issuance (Details) (USD $)	12 Months Ended																0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 06, 2013		Mar. 26, 2013		Sep. 19, 2012		Apr. 18, 2012		Sep. 14, 2011		Mar. 30, 2011		Nov. 17, 2005 Series E Preferred Stock [Member]	Mar. 13, 2014 Private Placement [Member] item
Stock Authorization And Issuance [Line Items]
Preferred Stock, Shares Authorized	15,000,000															100,000
Percentage of aggregate purchase price paid of amount due to investor for each thirty day period of registration default	1.00%																1.00%
Registration default, maximum penalty, percentage of aggregate purchase price	6.00%																6.00%
Registration default, maximum penalty amount	$ 839,399																$ 720,000
Sale of common stock, number of shares	93,208,471	82,903,609		3,681,000		4,715,000	[1]	4,382,000		8,139,000		7,800,000		3,332,117	[2]		2,666,666
Sale of stock price per share				$ 3.80		$ 3.25	[1]	$ 2.30		$ 1.05		$ 0.88		$ 0.71	[2]		$ 4.50
Number of accredited investors in private placement																	2
Proceeds from issurance of common stock in private placement																	11,900,000
Percentage of outstanding common stock on an after-issued basis				4.00%	[3]	5.40%	[1],[3]	5.30%	[3]	10.70%	[3]	11.60%	[3]	10.20%	[2],[3]		2.80%
Net proceeds from issuance of common stock in public and private offerings	$ 27,327,975	$ 17,555,674	$ 10,556,754

[1] Ladenburg Thalmann Financial Services Inc. acted as underwriter for the transaction.

[2] Offering included the sale of 3,332,117 shares of common stock at $0.71 per share and 2,691,360 units, each consisting of one share of common stock and three-tenths of a warrant to purchase common stock, at $0.81 per unit. The warrants are exercisable beginning September 30, 2011 and expire on September 30, 2016. The warrants were recorded at their relative fair value of approximately $0.4 million as estimated at their grant date using the Black-Scholes option pricing model (see Note 8)

[3] Calculated on an after-issued basis.