Restatements (Details) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Balance Sheet data:
Deferred revenue, current (notes 5 and 6)	$ 7,570,064	$ 7,234,697	$ 6,128,950	$ 7,234,697	$ 7,570,064	$ 7,990,231	$ 12,507,471
Deferred revenue, long-term	2,901,153	5,062,366	7,416,485	5,062,366	2,901,153	2,718,180	1,647,249
Total liabilities	10,471,217	12,297,063	13,545,435	12,297,063	10,471,217	25,961,437	19,524,817
Accumulated deficit	(10,471,217)	(12,297,063)	(13,545,435)	(12,297,063)	(10,471,217)	(93,919,395)	(95,571,576)
Total stockholders equity	(10,471,217)	(12,297,063)	(13,545,435)	(12,297,063)	(10,471,217)	49,777,213	4,120,393	9,786,330	14,458,299
Statement of Operations data:
Contract revenue	1,825,846	1,248,372	(13,545,435)	(12,297,063)	(10,471,217)
Income (loss) from operations	1,825,846	1,248,372	(13,545,435)	(12,297,063)	(10,471,217)
Income (loss) before income taxes	1,825,846	1,248,372	(13,545,435)	(12,297,063)	(10,471,217)
Net (loss) income	1,825,846	1,248,372	(13,545,435)	(12,297,063)	(10,471,217)	1,652,181	(23,325,116)	(13,032,942)
Basic earnings per common share						$ 0.05	$ (0.82)	$ (0.56)
Diluted earnings per share						$ 0.05	$ (0.82)	$ (0.56)
As Restated [Member]
Balance Sheet data:
Deferred revenue, current (notes 5 and 6)	22,719,625	22,314,498	18,672,911	22,314,498	22,719,625
Deferred revenue, long-term	4,257,512	6,538,085	8,977,644	6,538,085	4,257,512
Total liabilities	43,316,008	40,303,950	35,073,403	40,303,950	43,316,008
Accumulated deficit	(102,515,606)	(85,038,319)	(88,820,960)	(85,038,319)	(102,515,606)
Total stockholders equity	558,730	15,764,060	11,332,773	15,764,060	558,730
Statement of Operations data:
Contract revenue	1,875,446	16,297,972	16,504,165	32,802,137	34,677,583
Income (loss) from operations	(14,058,820)	7,147,609	8,564,710	15,712,319	1,653,499
Income (loss) before income taxes	(17,477,287)	3,782,641	6,750,616	10,533,257	(6,944,030)
Net (loss) income	(17,477,287)	3,782,641	6,750,616	10,533,257	(6,944,030)
Basic earnings per common share	$ (0.58)	$ 0.13	$ 0.23	$ 0.36	$ (0.23)
Diluted earnings per share	$ (0.58)	$ 0.12	$ 0.23	$ 0.35	$ (0.23)
As Reported [Member]
Balance Sheet data:
Deferred revenue, current (notes 5 and 6)	15,149,561	15,079,801	12,543,961	15,079,801	15,149,561
Deferred revenue, long-term	1,356,359	1,475,719	1,561,159	1,475,719	1,356,359
Total liabilities	32,844,791	28,006,887	21,527,968	28,006,887	32,844,791
Accumulated deficit	(92,044,389)	(72,741,256)	(75,275,525)	(72,741,256)	(92,044,389)
Total stockholders equity	11,029,947	28,061,123	24,878,208	28,061,123	11,029,947
Statement of Operations data:
Contract revenue	49,600	15,049,600	30,049,600	45,099,200	45,148,800
Income (loss) from operations	(15,884,666)	5,899,237	22,110,145	28,009,382	12,124,716
Income (loss) before income taxes	(19,303,133)	2,534,269	20,296,051	22,830,320	3,527,187
Net (loss) income	$ (19,303,133)	$ 2,534,269	$ 20,296,051	$ 22,830,320	$ 3,527,187
Basic earnings per common share	$ (0.64)	$ 0.09	$ 0.69	$ 0.77	$ 0.12
Diluted earnings per share	$ (0.64)	$ 0.08	$ 0.69	$ 0.76	$ 0.12