Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue:
Total revenue	$ 7,859	$ 6,152	$ 14,407	$ 13,189
Cost of revenue:
Total cost of revenue	3,672	1,482	6,344	3,595
Gross margin	4,187	4,670	8,063	9,594
Operating expenses:
Research and development	2,647	2,893	5,393	5,340
Sales and marketing	3,340	3,279	6,488	6,225
General and administrative	3,477	3,677	7,078	7,297
Total operating expenses	9,464	9,849	18,959	18,862
Operating loss	(5,277)	(5,179)	(10,896)	(9,268)
Other income	27		27
Interest income, net	293	45	565	48
Net loss	(4,957)	(5,134)	(10,304)	(9,220)
Cumulative dividend on convertible preferred stock	(335)	(335)	(666)	(666)
Net loss attributable to common stockholders	$ (5,292)	$ (5,469)	$ (10,970)	$ (9,886)
Net loss per share attributable to common stockholders:
Basic	$ (0.07)	$ (0.07)	$ (0.14)	$ (0.13)
Diluted	$ (0.07)	$ (0.07)	$ (0.14)	$ (0.13)
Weighted average number of common shares and equivalents:
Basic	81,049,211	75,953,916	78,787,652	75,915,864
Diluted	81,049,211	75,953,916	78,787,652	75,915,864
Systems [Member]
Revenue:
Total revenue	$ 3,313	$ 602	$ 5,134	$ 2,236
Cost of revenue:
Total cost of revenue	2,703	509	4,400	1,801
Disposables Service and Accessories [Member]
Revenue:
Total revenue	4,546	5,550	9,273	10,953
Cost of revenue:
Total cost of revenue	$ 969	$ 973	$ 1,944	$ 1,794