Net Loss Per Common Share (Reconciliation of Net Loss Per Share) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net Loss	$ (1,376,450)	$ (1,048,758)	$ (3,388,586)	$ (3,824,979)	$ (5,541,404)	$ (4,518,260)	$ (5,524,324)	$ (5,763,032)	$ (9,638,773)	$ (21,347,020)	$ (30,762,273)
Preferred stock dividends									(3,672,785)	(4,016,705)	(4,370,247)
NET LOSS AVAILABLE TO COMMON SHAREHOLDERS	$ (2,098,639)	$ (1,980,438)	$ (4,345,893)	$ (4,886,588)	$ (6,520,944)	$ (5,491,383)	$ (6,554,059)	$ (6,797,339)	$ (13,311,558)	$ (25,363,725)	$ (35,132,520)
Denominator:
Basic weighted average shares outstanding									78,586,266	60,580,742	40,497,098
Effect of dilutive securities									0	0	0
Diluted weighted average shares outstanding									78,586,266	60,580,742	40,497,098
Net loss per common share:
Basic earnings per common share (in usd per share)	$ (0.02)	$ (0.02)	$ (0.06)	$ (0.07)	$ (0.09)	$ (0.09)	$ (0.11)	$ (0.13)	$ (0.17)	$ (0.42)	$ (0.87)
Diluted earnings per common share (in usd per share)	$ (0.02)	$ (0.02)	$ (0.06)	$ (0.07)	$ (0.09)	$ (0.09)	$ (0.11)	$ (0.13)	$ (0.17)	$ (0.42)	$ (0.87)