Statements Of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue:
Systems	$ 3,092,935	$ 1,153,282	$ 5,924,113	$ 2,488,136
Disposables, service and accessories	6,571,315	6,894,255	13,271,163	13,914,071
Total revenue	9,664,250	8,047,537	19,195,276	16,402,207
Cost of revenue:
Systems	1,849,275	1,080,785	3,249,542	1,640,212
Disposables, service and accessories	1,093,988	903,977	2,324,359	1,963,634
Total cost of revenue	2,943,263	1,984,762	5,573,901	3,603,846
Gross margin	6,720,987	6,062,775	13,621,375	12,798,361
Operating expenses:
Research and development	1,419,826	1,312,743	2,905,533	2,816,189
Sales and marketing	4,250,779	4,096,155	8,285,150	7,727,420
General and administrative	2,772,708	2,943,510	5,567,297	6,773,377
Total operating expenses	8,443,313	8,352,408	16,757,980	17,316,986
Operating loss	(1,722,326)	(2,289,633)	(3,136,605)	(4,518,625)
Other income	999,169	1,181,126	106,792	104,987
Interest income	493	1,695	1,355	3,929
Interest expense	(816,023)	(834,667)	(1,645,810)	(1,671,617)
Net loss	$ (1,538,687)	$ (1,941,479)	$ (4,674,268)	$ (6,081,326)
Net loss per common share:
Basic	$ (0.07)	$ (0.10)	$ (0.22)	$ (0.31)
Diluted	$ (0.07)	$ (0.10)	$ (0.22)	$ (0.31)
Weighted average shares used in computing net loss per common share:
Basic	21,007,103	19,631,469	20,871,244	19,483,603
Diluted	21,007,103	19,631,469	20,871,244	19,483,603