Statements Of Operations (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:
Systems	$ 1,153,282	$ 3,323,251	$ 2,488,136	$ 5,551,328
Disposables, service and accessories	6,894,255	6,410,156	13,914,071	12,590,284
Total revenue	8,047,537	9,733,407	16,402,207	18,141,612
Cost of revenue:
Systems	1,080,785	1,602,480	1,640,212	2,793,833
Disposables, service and accessories	903,977	869,408	1,963,634	1,870,701
Total cost of revenue	1,984,762	2,471,888	3,603,846	4,664,534
Gross margin	6,062,775	7,261,519	12,798,361	13,477,078
Operating expenses:
Research and development	1,312,743	1,484,096	2,816,189	3,013,303
Sales and marketing	4,096,155	4,254,546	7,727,420	9,110,560
General and administrative	2,943,510	3,276,967	6,773,377	6,700,708
Total operating expenses	8,352,408	9,015,609	17,316,986	18,824,571
Operating loss	(2,289,633)	(1,754,090)	(4,518,625)	(5,347,493)
Other income	1,181,126	893,642	104,987	1,499,744
Interest income	1,695	1,256	3,929	2,668
Interest expense	(834,667)	(2,147,600)	(1,671,617)	(4,081,858)
Net loss	$ (1,941,479)	$ (3,006,792)	$ (6,081,326)	$ (7,926,939)
Net loss per common share:
Basic	$ (0.10)	$ (0.37)	$ (0.31)	$ (0.98)
Diluted	$ (0.10)	$ (0.37)	$ (0.31)	$ (0.98)
Weighted average shares used in computing net loss per common share:
Basic	19,631,469	8,188,837	19,483,603	8,102,087
Diluted	19,631,469	8,188,837	19,483,603	8,102,087