Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue:
Total revenue	$ 4,502	$ 7,859	$ 11,382	$ 14,407
Cost of revenue:
Total cost of revenue	1,189	3,672	4,103	6,344
Gross margin	3,313	4,187	7,279	8,063
Operating expenses:
Research and development	2,273	2,647	4,516	5,393
Sales and marketing	3,301	3,340	6,304	6,488
General and administrative	3,760	3,477	7,226	7,078
Total operating expenses	9,334	9,464	18,046	18,959
Operating loss	(6,021)	(5,277)	(10,767)	(10,896)
Other income (expense)	(3)	27	(3)	27
Interest income, net	191	293	430	565
Net loss	(5,833)	(4,957)	(10,340)	(10,304)
Cumulative dividend on convertible preferred stock	(325)	(335)	(656)	(666)
Net loss attributable to common stockholders	$ (6,158)	$ (5,292)	$ (10,996)	$ (10,970)
Net loss per share attributable to common stockholders:
Basic	$ (0.07)	$ (0.07)	$ (0.13)	$ (0.14)
Diluted	$ (0.07)	$ (0.07)	$ (0.13)	$ (0.14)
Weighted average number of common shares and equivalents:
Basic	84,570,738	81,049,211	84,025,335	78,787,652
Diluted	84,570,738	81,049,211	84,025,335	78,787,652
Systems [Member]
Revenue:
Total revenue	$ 240	$ 3,313	$ 2,852	$ 5,134
Cost of revenue:
Total cost of revenue	187	2,703	2,087	4,400
Disposables Service and Accessories [Member]
Revenue:
Total revenue	4,262	4,546	8,530	9,273
Cost of revenue:
Total cost of revenue	$ 1,002	$ 969	$ 2,016	$ 1,944