Equity Transactions (Details) (USD $)	0 Months Ended			12 Months Ended				0 Months Ended
	Oct. 15, 2013	Oct. 23, 2012	Aug. 01, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 08, 2011	Feb. 05, 2014 Subsequent Event [Member]
Subsequent Event [Line Items]
Stock issued, underwritten public offering, value	$ 25,900,000	$ 23,000,000	$ 20,400,000	$ 24,094,530	$ 21,476,815	$ 6,722,939		$ 86,000,000
Stock issued, underwritten public offering, value (in shares)	11,500,000	9,200,000	5,600,000					13,200,000
Reverse stock split conversation ratio				1-for-7
Common stock per share value (in dollars per share)	$ 2.25	$ 2.50	$ 3.57					$ 6.5
Common stock additional share purchase (in shares)			6,400,000
Exercise price of common stock (in dollars per share)			$ 4.48	$ 30
Net proceeds from issuance of common stock	$ 24,100,000	$ 21,500,000	$ 18,900,000	$ 24,094,530	$ 21,476,815	$ 18,939,619		$ 80,500,000
Warrants per share value (in dollars per share)			$ 0.07
Common stock, shares authorized (in shares)				250,000,000	250,000,000		175,000,000
Series A preferred stock, shares authorized (in shares)				25,000	25,000		15,000