Statements of Operations (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue:
Systems Revenue	$ 2,037,742	$ 8,153,088	$ 11,350,461	$ 22,826,700
Recurring Revenue	6,506,272	5,719,166	19,020,396	16,680,241
Total revenue	8,544,014	13,872,254	30,370,857	39,506,941
Cost of revenue:
Systems Cost of Goods Sold	1,723,874	3,091,734	6,428,783	9,482,225
Disposables Service and Accessories Cost of Goods Sold	933,380	763,348	2,749,796	2,219,680
Total cost of revenue	2,657,254	3,855,082	9,178,579	11,701,905
Gross margin	5,886,760	10,017,172	21,192,278	27,805,036
Operating expenses:
Research and development	3,529,321	2,868,426	10,234,757	9,595,972
Sales and marketing	6,885,786	7,269,005	24,936,641	22,410,734
General and administrative	4,527,489	3,471,244	13,384,313	11,337,637
Total operating expenses	14,942,596	13,608,675	48,555,711	43,344,343
Operating loss	(9,055,836)	(3,591,503)	(27,363,433)	(15,539,307)
Other income (expense)	2,611,067	(920,222)	3,251,822	49,830
Interest income	1,817	3,004	7,137	7,934
Interest expense	(830,118)	(635,176)	(2,413,214)	(1,951,098)
Net loss	$ (7,273,070)	$ (5,143,897)	$ (26,517,688)	$ (17,432,641)
Net loss per common share:
Basic and diluted	$ (0.13)	$ (0.10)	$ (0.48)	$ (0.35)
Weighted average shares used in computing net loss per common share:
Basic and diluted	54,878,235	50,137,857	54,793,509	49,847,321