Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Systems	$ 1,582,053	$ 4,275,798
Disposables, service and accessories	27,764,564	26,868,302
Total revenue	29,346,617	31,144,100
Cost of revenue:
Systems	1,788,658	6,199,643
Disposables, service and accessories	3,928,521	4,554,596
Total cost of revenue	5,717,179	10,754,239
Gross margin	23,629,438	20,389,861
Operating expenses:
Research and development	8,219,387	6,704,200
Sales and marketing	12,965,920	13,627,724
General and administrative	4,901,170	5,977,534
Total operating expenses	26,086,477	26,309,458
Operating loss	(2,457,039)	(5,919,597)
Other income	2,590,361	212,031
Interest income (expense)	(16,566)	(179,844)
Net income (loss)	116,756	(5,887,410)
Cumulative dividend on convertible preferred stock	(1,434,000)	(1,432,259)
Net loss attributable to common stockholders	$ (1,317,244)	$ (7,319,669)
Net loss per share attributable to common stockholders:
Basic	$ (0.03)	$ (0.32)
Diluted	$ (0.03)	$ (0.32)
Weighted average number of common shares and equivalents:
Basic	52,082,618	22,614,248
Diluted	52,082,618	22,614,248