Statements Of Operations - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
Systems	$ 2,075,019	$ 2,831,178
Disposables, service and accessories	6,572,987	6,699,848
Total revenue	8,648,006	9,531,026
Cost of revenue:
Systems	1,083,099	1,400,267
Disposables, service and accessories	1,097,715	1,230,370
Total cost of revenue	2,180,814	2,630,637
Gross margin	6,467,192	6,900,389
Operating expenses:
Research and development	1,473,086	1,485,706
Sales and marketing	3,894,113	4,034,371
General and administrative	2,586,791	2,794,590
Total operating expenses	7,953,990	8,314,667
Operating loss	(1,486,798)	(1,414,278)
Other income (expense)	31,294	(892,377)
Interest income	222	862
Interest expense	(819,019)	(829,788)
Net loss	$ (2,274,301)	$ (3,135,581)
Net loss per common share:
Basic	$ (0.11)	$ (0.15)
Diluted	$ (0.11)	$ (0.15)
Weighted average shares used in computing net loss per common share:
Basic	21,611,612	20,742,932
Diluted	21,611,612	20,742,932