Quarterly Results of Operations (Unaudited) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 2,622,069	$ 4,345,073	$ 5,488,291	$ 6,037,417	$ 6,816,436	$ 6,787,549	$ 6,215,915	$ 5,763,461	$ 18,492,850	$ 25,583,361	$ 24,826,587
Gross profit/(loss)	2,318,960	852,213	2,207,193	2,119,479	1,959,046	2,078,145	444,307	714,261
Loss from operations	(5,603,691)	(3,969,659)	(1,178,995)	(1,673,168)	(757,659)	(1,430,614)	(3,100,769)	(3,403,664)	(12,425,513)	(8,692,706)	(20,932,802)
Net profit (loss)	(5,926,737)	(4,307,358)	(1,509,446)	1,289,114	(1,376,450)	(1,048,758)	(3,388,586)	(3,824,979)	(10,454,427)	(9,638,773)	(21,347,020)
Net profit (loss) available to common shareholders	$ (5,870,298)	$ (7,952,246)	$ (2,474,610)	$ 390,282	$ (2,098,639)	$ (1,980,438)	$ (4,345,893)	$ (4,886,588)	$ (15,906,872)	$ (13,311,558)	$ (25,363,725)
Basic earnings per common share (in usd per share)	$ (0.05)	$ (0.07)	$ (0.03)	$ 0.01	$ (0.02)	$ (0.02)	$ (0.06)	$ (0.07)	$ (0.14)	$ (0.17)	$ (0.42)
Diluted earnings per common share (in usd per share)	$ (0.05)	$ (0.07)	$ (0.03)	$ 0.01	$ (0.02)	$ (0.02)	$ (0.06)	$ (0.07)	$ (0.14)	$ (0.17)	$ (0.42)