Consolidated Statements Of Stockholders' (Deficit) Equity (USD $)	Registered Direct [Member] Common Stock	Registered Direct [Member] Additional Paid-In Capital	Registered Direct [Member]	Private Placement [Member] Common Stock	Private Placement [Member] Additional Paid-In Capital	Private Placement [Member]	CDC Warrant [Member] Additional Paid-In Capital	CDC Warrant [Member]	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Total
Balances at Dec. 31, 2008									$ 19,179	$ 58,706,499	$ (47,183)	$ (92,260,267)	$ (33,581,772)
Balances, (in shares) at Dec. 31, 2008									19,179,029
Stock-based compensation										2,003,031			2,003,031
Stock option exercises									266	663,105			663,371
Stock option exercises (in shares)									265,551
Warrants issuance										55,452			55,452
Warrants exercised									1,737	5,106,332			5,108,069
Warrants exercised (shares)									1,737,274
CDC warrant derivative reclassified to equity										7,163,399			7,163,399
Net income (loss)												33,046,749	33,046,749
Balances at Dec. 31, 2009									21,182	73,697,818	(47,183)	(59,213,518)	14,458,299
Balances, (in shares) at Dec. 31, 2009									21,181,854
Stock-based compensation										1,376,467			1,376,467
Stock option exercises									32	97,850			97,882
Stock option exercises (in shares)									31,733
Stock offering, net	2,825	9,744,675	9,747,500
Stock offering, net (in shares)	2,824,858
Warrants related to equity financing										(2,860,876)			(2,860,876)
Net income (loss)												(13,032,942)	(13,032,942)
Balances at Dec. 31, 2010									24,039	82,055,934	(47,183)	(72,246,460)	9,786,330
Balances, (in shares) at Dec. 31, 2010									24,038,445
Stock-based compensation										1,226,724			1,226,724
Stock option exercises									130	349,546			349,676
Stock option exercises (in shares)									129,888
Warrants exercised									601	1,748,658			1,749,259
Warrants exercised (shares)									601,120
CDC warrant derivative reclassified to equity							336,747	336,747
Stock offering, net				4,808	13,991,965	13,996,773
Stock offering, net (in shares)				4,807,693
Net income (loss)												(23,325,116)	(23,325,116)
Balances at Dec. 31, 2011									$ 29,578	$ 99,709,574	$ (47,183)	$ (95,571,576)	$ 4,120,393
Balances, (in shares) at Dec. 31, 2011									29,577,146