Statements Of Operations (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Systems	$ 5,179,505	$ 4,288,176
Disposables, service and accessories	7,103,723	5,936,528
Total revenue	12,283,228	10,224,704
Cost of revenue:
Systems	2,342,410	2,184,478
Disposables, service and accessories	1,419,421	820,501
Total cost of revenue	3,761,831	3,004,979
Gross margin	8,521,397	7,219,725
Operating expenses:
Research and development	2,825,207	3,394,259
Sales and marketing	5,998,739	8,338,336
General and administrative	3,872,873	4,250,269
Total operating expenses	12,696,819	15,982,864
Operating loss	(4,175,422)	(8,763,139)
Other income (expense)	(188,070)	20,346
Interest income	1,363	3,187
Interest expense	(1,450,783)	(810,327)
Net loss	$ (5,812,912)	$ (9,549,933)
Net loss per common share:
Basic and diluted	$ (0.11)	$ (0.17)
Weighted average shares used in computing net loss per common share:
Basic and diluted	54,993,157	54,719,677