Statements Of Operations (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Statements Of Operations [Abstract]
Revenues, net	$ 350,351	$ 364,574	$ 1,047,857	$ 1,010,753
Cost of sales	134,411	147,257	558,205	473,578
Gross profit	215,940	217,317	489,652	537,175
Operating expenses:
Research and development	562,723	463,410	1,606,987	1,373,248
Selling, general and administrative	1,364,326	1,624,524	4,413,535	4,792,150
Total operating expenses	1,927,049	2,087,934	6,020,522	6,165,398
Loss from operations	(1,711,109)	(1,870,617)	(5,530,870)	(5,628,223)
Other income (expense):
Interest income	329	600	706	3,135
Interest expense	(96,722)	(4,107)	(208,182)	(4,992)
Local business tax	212	(1,104)	(1,200)	(2,570)
Total other income (expense), net	(96,181)	(4,611)	(208,676)	(4,427)
Loss before income taxes	(1,807,290)	(1,875,228)	(5,739,546)	(5,632,650)
Net loss	$ (1,807,290)	$ (1,875,228)	$ (5,739,546)	$ (5,632,650)
Basic and diluted net loss per share	$ (0.32)	$ (0.34)	$ (1.01)	$ (1.03)
Shares used to compute basic and diluted net loss per share	5,683,076	5,584,974	5,671,208	5,460,353