CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2009	$ 136	$ 88,969	$ 76,931,065	$ (63,367,553)	$ 13,652,617
Balance (in shares) at Dec. 31, 2009	135,572	88,968,812
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	0	1,360	621,771	0	623,131
Exercise of stock options (in shares)		1,359,851
Stock issued under equity incentive plans	0	481	(481)	0	0
Stock issued under equity incentive plans (in shares)		481,100
Stock-based compensation expense	0	0	967,695	0	967,695
Preferred stock converted into common stock	(29)	67	11,440	(11,478)	0
Preferred stock converted into common stock (in shares)	(28,400)	67,083
Preferred stock dividends	0	191	207,030	(207,221)	0
Preferred stock dividends (in shares)		191,511
Net loss	0	0	0	(2,932,793)	(2,932,793)
Balance at Dec. 31, 2010	107	91,068	78,738,520	(66,519,045)	12,310,650
Balance (in shares) at Dec. 31, 2010	107,172	91,068,357
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	0	48	23,927	0	23,975
Exercise of stock options (in shares)		48,084
Stock issued under equity incentive plans	0	4	(4)	0	0
Stock issued under equity incentive plans (in shares)		2,836
Stock-based compensation expense	0	0	256,124	0	256,124
Preferred stock dividends	0	550	136,951	(166,042)	(28,541)
Preferred stock dividends (in shares)		550,915
Net loss	0	0	0	(6,360,103)	(6,360,103)
Balance at Dec. 31, 2011	$ 107	$ 91,670	$ 79,155,518	$ (73,045,190)	$ 6,202,105
Balance (in shares) at Dec. 31, 2011	107,172	91,670,192