Consolidated Statements of Shareholders' Equity (Deficiency) (USD $)	Total USD ($)	Series B Preferred Stock [Member]	Series E Preferred Stock [Member] USD ($)	Preferred Stock [Member] Series B Preferred Stock [Member] USD ($)	Preferred Stock [Member] Series E Preferred Stock [Member] USD ($)	Common Stock [Member] USD ($)	Common Stock [Member] Series E Preferred Stock [Member] USD ($)	Additional Paid-in Capital [Member] USD ($)	Additional Paid-in Capital [Member] Series E Preferred Stock [Member] USD ($)	Treasury Stock [Member] USD ($)	Treasury Stock [Member] Series E Preferred Stock [Member] USD ($)	Retained Earnings [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)
Beginning balance at Dec. 31, 2009	$ (17,824,310)			$ 1	$ 590	$ 657,619		$ 238,579,829		$ 280,813		$ (256,979,263)	$ 197,727
Beginning balance, shares at Dec. 31, 2009				130	59,000	65,761,986				131,935
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, shares						18,607,407
Issuance of common stock	19,415,482					186,074		19,229,408
Warrants exercise, shares										59,375
Warrants exercised	79,148							22,148		57,000
Share based compensation expense, shares						65,218
Share based compensation expense	2,800,256					652		2,799,604
Repurchase of company stock, shares	(46,930)									(3,333,330)
Repurchase of company stock	(3,059,997)
Purchase of treasury stock, shares										(56,234)
Purchase of treasury stock	(62,280)									(62,280)
Dividends on preferred stock	(30,000)							(30,000)
Reclassification of redeemable warrant liability to capital in excess of par value	0
Translation adjustment	(1,123)												(1,123)
Net income (loss)	(21,830,682)											(21,830,682)
Ending balance at Dec. 31, 2010	(20,513,506)			1	590	844,345		260,600,989		3,346,090		(278,809,945)	196,604
Ending balance, shares at Dec. 31, 2010				130	59,000	84,434,611				3,462,124
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Warrants exercise, shares						868,072				1,993,860
Warrants exercised	1,214,697					8,681		(721,019)		1,927,035
Options exercised	2,641,950					6,900		1,673,336		961,714
Options exercised, shares						689,950				995,064
Conversion of Preferred Stock, shares			(36,260)		(36,260)		1,339,800				473,200
Conversion of Preferred Stock			0		(363)		13,398		(470,376)		457,341
Share based compensation expense, shares						34,880
Share based compensation expense	814,520					349		814,171
Repurchase of company stock, shares	0
Repurchase of company stock										(3,059,997)
Purchase of treasury stock, shares										(36,448)
Purchase of treasury stock	(125,381)									(125,381)
Dividends on preferred stock	(30,000)							(30,000)
Reclassification of redeemable warrant liability to capital in excess of par value	16,193,037							16,193,037
Translation adjustment	(13,721)												(13,721)
Loss on short term investments	(77,981)												(77,981)
Net income (loss)	20,527,192
Ending balance at Dec. 31, 2011	20,630,807			1	227	873,673		278,060,138		125,381		(258,282,753)	104,902
Ending balance, shares at Dec. 31, 2011				130	22,740	87,367,313				36,448
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share based compensation expense, shares						176,468
Share based compensation expense	668,392					1,764		666,628
Repurchase of company stock, shares	0
Dividends on preferred stock	(29,334)							(29,334)
Reclassification of redeemable warrant liability to capital in excess of par value	0
Translation adjustment	3,118												3,118
Loss on short term investments	175,201												175,201
Net income (loss)	9,917,273
Ending balance at Dec. 31, 2012	$ 31,365,457			$ 1	$ 227	$ 875,437		$ 278,697,432		$ 125,381		$ (248,365,480)	$ 283,221
Ending balance, shares at Dec. 31, 2012				130	22,740	87,543,781				36,448