Quarterly Results of Operations (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
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 6,816,436	$ 6,787,549	$ 6,215,915	$ 5,763,461	$ 7,232,135	$ 6,818,777	$ 6,985,909	$ 3,789,766	$ 25,583,361	$ 24,826,587	$ 5,138,616
Gross profit/(loss)	1,959,046	2,078,145	444,307	714,261	(1,166,039)	133,900	(1,501,492)	(252,672)
Loss from operations	(757,659)	(1,430,614)	(3,100,769)	(3,403,664)	(5,086,941)	(4,442,748)	(5,664,953)	(5,738,160)	(8,692,706)	(20,932,802)	(30,319,634)
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)
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)
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)