Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Systems	$ 715,484	$ 1,597,537	$ 1,043,510	$ 3,644,871
Disposables, service and accessories	6,839,995	6,546,198	21,035,002	19,943,562
Total revenue	7,555,479	8,143,735	22,078,512	23,588,433
Cost of revenue:
Systems	596,869	888,800	1,257,980	2,029,760
Disposables, service and accessories	1,036,589	1,032,569	3,029,875	3,350,480
Total cost of revenue	1,633,458	1,921,369	4,287,855	5,380,240
Gross margin	5,922,021	6,222,366	17,790,657	18,208,193
Operating expenses:
Research and development	2,000,780	1,619,749	5,995,800	4,976,892
Sales and marketing	2,819,101	3,079,562	9,911,514	10,479,626
General and administrative	1,215,920	1,355,258	3,753,703	4,921,513
Total operating expenses	6,035,801	6,054,569	19,661,017	20,378,031
Operating income (loss)	(113,780)	167,797	(1,870,360)	(2,169,838)
Other income (expense)		(4,459,042)	2,590,361	(1,029,479)
Interest expense (net)	(2,515)	(43,077)	(33,271)	(135,336)
Net income (loss)	(116,295)	(4,334,322)	686,730	(3,334,653)
Cumulative dividend on convertible preferred stock	(361,447)	(337,963)	(1,072,553)	(1,070,812)
Net loss attributable to common stockholders	$ (477,742)	$ (4,672,285)	$ (385,823)	$ (4,405,465)
Net loss per share attributable to common stockholders:
Basic	$ (0.01)	$ (0.21)	$ (0.01)	$ (0.20)
Diluted	$ (0.01)	$ (0.21)	$ (0.01)	$ (0.20)
Weighted average number of common shares and equivalents:
Basic	59,008,219	22,750,405	49,733,553	22,551,496
Diluted	59,008,219	22,750,405	49,733,553	22,551,496