Financial Information by Quarter (Unaudited) Restatement (Details) - Condensed Consolidated Balance Sheets (USD $)	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets, Current	$ 84,946,176	$ 42,540,233	$ 46,578,955	$ 46,636,330	$ 52,978,703	$ 14,538,719	$ 17,240,832	$ 20,423,847
Assets, Noncurrent		49,511,759	46,062,035	42,391,291		36,245,375	34,727,750	2,203,499
Total assets	105,836,130	92,051,992	92,640,990	89,027,621	90,380,477	50,784,094	51,968,582	22,627,346
Common Stock Warrants, Current, Fair Value		235,046	100,637	157,014		233,499	1,686,760	0
Common stock warrants, noncurrent	657,246	1,788,682	1,789,716	2,380,660	1,412,304	2,402,720	13,791,303	21,278,533
Other liabilities	166,303	59,562,651	57,661,062	50,017,901	147,586	3,779,449	3,268,952	3,474,238
Common Stock, Value, Issued	5,164	5,164	5,164	5,164	5,164	5,142	5,131	5,038
Additional Paid in Capital		167,192,629	166,757,855	166,373,488		164,593,317	161,772,778	153,771,676
Accumulated deficit	(139,350,536)	(136,732,180)	(133,673,444)	(129,906,606)	(125,290,997)	(120,230,033)	(128,556,342)	(155,902,139)
Total stockholders' equity	28,243,002	30,465,613	33,089,575	36,472,046	40,770,859	44,368,426	33,221,567	(2,125,425)	(12,912,917)	(3,489,473)
Total liabilities and stockholders' equity	105,836,130	92,051,992	92,640,990	89,027,621	90,380,477	50,784,094	51,968,582	22,627,346
Total liabilities	77,593,128	61,586,379	59,551,415	52,555,575	49,609,618	6,415,668	18,747,015	24,752,771
Scenario, Previously Reported [Member]
Assets, Current	84,946,176	42,540,233	46,578,955	46,636,330	52,978,703	14,538,719	17,240,832	20,423,847
Assets, Noncurrent		49,511,759	46,062,035	42,391,291		36,245,375	34,727,750	2,203,499
Total assets	105,836,130	92,051,992	92,640,990	89,027,621	90,380,477	50,784,094	51,968,582	22,627,346
Common Stock Warrants, Current, Fair Value		0	0	0		0	0	0
Common stock warrants, noncurrent	0	749,771	734,739	1,059,751	622,938	1,024,987	5,751,035	7,790,886
Other liabilities	166,303	59,562,651	57,661,062	50,017,901	147,586	3,779,449	3,268,952	3,474,238
Common Stock, Value, Issued	5,164	5,164	5,164	5,164	5,164	5,142	5,131	5,038
Additional Paid in Capital		151,944,558	151,509,784	150,868,007		149,087,836	146,267,297	138,522,944
Accumulated deficit	(123,398,462)	(120,210,152)	(117,269,759)	(112,923,202)	(108,870,309)	(103,113,320)	(103,323,833)	(127,165,760)
Total stockholders' equity	28,947,005	31,739,570	34,245,189	37,949,969	41,686,066	45,979,658	42,948,595	11,362,222
Total liabilities and stockholders' equity	105,836,130	92,051,992	92,640,990	89,027,621	90,380,477	50,784,094	51,968,582	22,627,346
Total liabilities	76,889,125	60,312,422	58,395,801	51,077,652	48,694,411	4,804,436	9,019,987	11,265,124
Revised Adjustment [Member]
Assets, Current	0
Total assets	0
Common Stock Warrants, Current, Fair Value		235,046	100,637	157,014
Common stock warrants, noncurrent	657,246	1,038,911	1,054,977	1,320,909
Additional Paid in Capital		15,248,071	15,248,071	15,505,481
Accumulated deficit	(15,952,074)	(16,522,028)	(16,403,685)	(16,983,404)
Total stockholders' equity	(704,003)	(1,273,957)	(1,155,614)	(1,477,923)
Total liabilities and stockholders' equity	0	0	0	0
Total liabilities	704,003	1,273,957	1,155,614	1,477,923
Restatement Adjustment [Member]
Assets, Current					0
Total assets					0
Common Stock Warrants, Current, Fair Value						233,499	1,686,760	0
Common stock warrants, noncurrent					789,366	1,377,733	8,040,268	13,487,647
Additional Paid in Capital						15,505,481	15,505,481	15,248,732
Accumulated deficit					(16,420,688)	(17,116,713)	(25,232,509)	(28,736,379)
Total stockholders' equity					(915,207)	(1,611,232)	(9,727,028)	(13,487,647)
Total liabilities and stockholders' equity					0	0	0	0
Total liabilities					$ 915,207	$ 1,611,232	$ 9,727,028	$ 13,487,647