Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Sublease	$ 986,123
Total revenue	28,902,550	$ 29,346,617
Cost of revenue:
Sublease	986,122
Total cost of revenue	6,136,459	5,717,179
Gross margin	22,766,091	23,629,438
Operating expenses:
Research and development	9,021,403	8,219,387
Sales and marketing	12,733,389	12,965,920
General and administrative	5,838,158	4,901,170
Total operating expenses	27,592,950	26,086,477
Operating loss	(4,826,859)	(2,457,039)
Other income		2,590,361
Interest income (expense)	235,575	(16,566)
Net income (loss)	(4,591,284)	116,756
Cumulative dividend on convertible preferred stock	(1,429,400)	(1,434,000)
Loss attributable to common stockholders	$ (6,020,684)	$ (1,317,244)
Net loss per share attributable to common stockholders:
Basic	$ (0.10)	$ (0.03)
Diluted	$ (0.10)	$ (0.03)
Weighted average number of common shares and equivalents:
Basic	63,051,581	52,082,618
Diluted	63,051,581	52,082,618
Systems [Member]
Revenue:
Total revenue	$ 2,066,253	$ 1,582,053
Cost of revenue:
Total cost of revenue	1,411,423	1,788,658
Disposables, Service and Accessories [Member]
Revenue:
Total revenue	25,850,174	27,764,564
Cost of revenue:
Total cost of revenue	$ 3,738,914	$ 3,928,521