Selected Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Net (loss) income	$ (3,785,701)	$ (12,714,951)	$ (8,184,121)
Net loss attributable to common stockholders	(3,785,701)	(12,907,799)	(8,569,817)
Basic and diluted net loss per share:
Preferred stock cash dividends (in Dollars per share)	$ 0	$ (0.01)	$ (0.01)
Basic and diluted net (loss) income per share (in Dollars per share)	$ (0.11)	$ (0.38)	$ (0.26)
First Quarter [Member]
Selected Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Total net revenue	12,580,000	12,816,000
Total operating expense	14,395,000	17,349,000
Net (loss) income	(1,743,000)	(4,437,000)
Preferred stock cash dividends		96,000
Net loss attributable to common stockholders		(4,533,000)
Basic and diluted net loss per share:
Preferred stock cash dividends (in Dollars per share)		$ 0.00
Net loss attributable to common stockholders (in Dollars per share)		$ (0.14)
Basic and diluted net (loss) income per share (in Dollars per share)	$ (0.05)	$ (0.14)
Secord Quarter [Member]
Selected Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Total net revenue	13,484,000	12,481,000
Total operating expense	14,627,000	14,464,000
Net (loss) income	(1,076,000)	(1,875,000)
Preferred stock cash dividends		97,000
Net loss attributable to common stockholders		(1,972,000)
Basic and diluted net loss per share:
Preferred stock cash dividends (in Dollars per share)		$ 0.00
Net loss attributable to common stockholders (in Dollars per share)		$ (0.06)
Basic and diluted net (loss) income per share (in Dollars per share)	$ (0.03)	$ (0.06)
Third Quarter [Member]
Selected Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Total net revenue	13,585,000	11,598,000
Total operating expense	14,796,000	15,916,000
Net (loss) income	(1,179,000)	(4,227,000)
Preferred stock cash dividends		0
Net loss attributable to common stockholders		(4,227,000)
Basic and diluted net loss per share:
Preferred stock cash dividends (in Dollars per share)		$ 0
Net loss attributable to common stockholders (in Dollars per share)		$ (0.13)
Basic and diluted net (loss) income per share (in Dollars per share)	$ (0.03)	$ (0.13)
Fourth Quarter [Member]
Selected Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data (Unaudited) [Line Items]
Total net revenue	14,801,000	13,826,000
Total operating expense	14,628,000	16,131,000
Net (loss) income	213,000	(2,176,000)
Preferred stock cash dividends		0
Net loss attributable to common stockholders		$ (2,176,000)
Basic and diluted net loss per share:
Preferred stock cash dividends (in Dollars per share)		$ 0
Net loss attributable to common stockholders (in Dollars per share)		$ (0.07)
Basic and diluted net (loss) income per share (in Dollars per share)	$ 0.01	$ (0.07)