Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Systems	$ 310,751	$ 1,828,439	$ 328,026	$ 2,047,334
Disposables, service and accessories	7,240,650	6,638,587	14,195,008	13,397,364
Total revenue	7,551,401	8,467,026	14,523,034	15,444,698
Cost of revenue:
Systems	457,509	920,517	661,111	1,140,961
Disposables, service and accessories	931,541	1,281,729	1,993,286	2,317,911
Total cost of revenue	1,389,050	2,202,246	2,654,397	3,458,872
Gross margin	6,162,351	6,264,780	11,868,637	11,985,826
Operating expenses:
Research and development	2,032,394	1,756,266	3,995,020	3,357,143
Sales and marketing	3,457,416	3,618,615	7,092,413	7,400,064
General and administrative	1,298,604	1,324,678	2,537,783	3,566,255
Total operating expenses	6,788,414	6,699,559	13,625,216	14,323,462
Operating loss	(626,063)	(434,779)	(1,756,579)	(2,337,636)
Other income		300,255	2,590,361	3,429,563
Interest expense (net)	(6,142)	(42,775)	(30,757)	(92,258)
Net income (loss)	(632,205)	(177,299)	803,025	999,669
Cumulative dividend on convertible preferred stock	(357,518)	(369,661)	(711,107)	(732,849)
Net income attributable to convertible preferred stock			(42,936)	(167,539)
Net income (loss) attributable to common stockholders	$ (989,723)	$ (546,960)	$ 48,982	$ 99,281
Net income (loss) per share attributable to common stockholders:
Basic	$ (0.02)	$ (0.02)	$ 0.00	$ 0.00
Diluted	$ (0.02)	$ (0.02)	$ 0.00	$ 0.00
Weighted average number of common shares and equivalents:
Basic	58,926,545	22,581,330	45,019,358	22,450,392
Diluted	58,926,545	22,581,330	45,728,732	22,458,479