Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Sublease	$ 246,532		$ 739,593
Total revenue	8,201,748	7,555,479	22,009,733	22,078,512
Cost of revenue:
Sublease	246,531		739,592
Total cost of revenue	1,831,593	1,633,458	4,391,138	4,287,855
Gross margin	6,370,155	5,922,021	17,618,595	17,790,657
Operating expenses:
Research and development	1,751,081	2,000,780	7,405,462	5,995,800
Sales and marketing	3,120,632	2,819,101	9,666,975	9,911,514
General and administrative	1,539,648	1,215,920	4,186,277	3,753,703
Total operating expenses	6,411,361	6,035,801	21,258,714	19,661,017
Operating loss	(41,206)	(113,780)	(3,640,119)	(1,870,360)
Other income				2,590,361
Interest income (expense)	84,954	(2,515)	133,329	(33,271)
Net income (loss)	43,748	(116,295)	(3,506,790)	686,730
Cumulative dividend on convertible preferred stock	(360,647)	(361,447)	(1,071,351)	(1,072,553)
Loss attributable to common stockholders	$ (316,899)	$ (477,742)	$ (4,578,141)	$ (385,823)
Net loss per share attributable to common stockholders:
Basic	$ (0.00)	$ (0.01)	$ (0.07)	$ (0.01)
Diluted	$ (0.00)	$ (0.01)	$ (0.07)	$ (0.01)
Weighted average number of common shares and equivalents:
Basic	64,294,153	59,008,219	61,405,083	49,733,553
Diluted	64,294,153	59,008,219	61,405,083	49,733,553
Systems [Member]
Revenue:
Total revenue	$ 1,696,964	$ 715,484	$ 1,755,015	$ 1,043,510
Cost of revenue:
Total cost of revenue	665,463	596,869	722,828	1,257,980
Disposables, Service and Accessories [Member]
Revenue:
Total revenue	6,258,252	6,839,995	19,515,125	21,035,002
Cost of revenue:
Total cost of revenue	$ 919,599	$ 1,036,589	$ 2,928,718	$ 3,029,875