Statements Of Operations (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue:
Systems	$ 2,831,178	$ 1,334,854
Disposables, service and accessories	6,699,848	7,019,816
Total revenue	9,531,026	8,354,670
Cost of revenue:
Systems	1,400,267	559,428
Disposables, service and accessories	1,230,370	1,059,658
Total cost of revenue	2,630,637	1,619,086
Gross margin	6,900,389	6,735,584
Operating expenses:
Research and development	1,485,706	1,503,446
Sales and marketing	4,034,371	3,631,264
General and administrative	2,794,590	3,829,866
Total operating expenses	8,314,667	8,964,576
Operating loss	(1,414,278)	(2,228,992)
Other expense	(892,377)	(1,076,139)
Interest income	862	2,233
Interest expense	(829,788)	(836,950)
Net loss	$ (3,135,581)	$ (4,139,848)
Net loss per common share:
Basic	$ (0.15)	$ (0.21)
Diluted	$ (0.15)	$ (0.21)
Weighted average shares used in computing net loss per common share:
Basic	20,742,932	19,403,325
Diluted	20,742,932	19,403,325