Statements Of Operations - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Systems	$ 935,978	$ 3,092,935	$ 3,010,997	$ 5,924,113
Disposables, service and accessories	6,938,645	6,571,315	13,511,632	13,271,163
Total revenue	7,874,623	9,664,250	16,522,629	19,195,276
Cost of revenue:
Systems	395,898	1,849,275	1,478,996	3,249,542
Disposables, service and accessories	699,173	1,093,988	1,796,888	2,324,359
Total cost of revenue	1,095,071	2,943,263	3,275,884	5,573,901
Gross margin	6,779,552	6,720,987	13,246,745	13,621,375
Operating expenses:
Research and development	1,421,380	1,419,826	2,894,465	2,905,533
Sales and marketing	4,211,706	4,250,779	8,105,819	8,285,150
General and administrative	2,786,046	2,772,708	5,372,838	5,567,297
Total operating expenses	8,419,132	8,443,313	16,373,122	16,757,980
Operating loss	(1,639,580)	(1,722,326)	(3,126,377)	(3,136,605)
Other income	135,370	999,169	166,664	106,792
Interest income	140	493	362	1,355
Interest expense	(829,046)	(816,023)	(1,648,066)	(1,645,810)
Net loss	$ (2,333,116)	$ (1,538,687)	$ (4,607,417)	$ (4,674,268)
Net loss per common share:
Basic	$ (0.11)	$ (0.07)	$ (0.21)	$ (0.22)
Diluted	$ (0.11)	$ (0.07)	$ (0.21)	$ (0.22)
Weighted average shares used in computing net loss per common share:
Basic	21,793,583	21,007,103	21,702,597	20,871,244
Diluted	21,793,583	21,007,103	21,702,597	20,871,244