Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue:
Total revenue	$ 7,799	$ 7,657	$ 22,206	$ 20,846
Cost of revenue:
Total cost of revenue	3,740	3,090	10,084	6,685
Gross margin	4,059	4,567	12,122	14,161
Operating expenses:
Research and development	2,668	2,818	8,061	8,158
Sales and marketing	3,097	3,111	9,585	9,337
General and administrative	3,933	3,690	11,011	10,986
Total operating expenses	9,698	9,619	28,657	28,481
Operating loss	(5,639)	(5,052)	(16,535)	(14,320)
Other income			27
Interest income, net	270	135	835	182
Net loss	(5,369)	(4,917)	(15,673)	(14,138)
Cumulative dividend on convertible preferred stock	(338)	(339)	(1,004)	(1,005)
Net loss attributable to common stockholders	$ (5,707)	$ (5,256)	$ (16,677)	$ (15,143)
Net loss per share attributable to common stockholders:
Basic	$ (0.07)	$ (0.07)	$ (0.21)	$ (0.20)
Diluted	$ (0.07)	$ (0.07)	$ (0.21)	$ (0.20)
Weighted average number of common shares and equivalents:
Basic	82,468,971	76,100,007	80,028,243	75,977,920
Diluted	82,468,971	76,100,007	80,028,243	75,977,920
Systems [Member]
Revenue:
Total revenue	$ 3,539	$ 2,413	$ 8,673	$ 4,649
Cost of revenue:
Total cost of revenue	2,909	2,016	7,309	3,817
Disposables Service and Accessories [Member]
Revenue:
Total revenue	4,260	5,244	13,533	16,197
Cost of revenue:
Total cost of revenue	$ 831	$ 1,074	$ 2,775	$ 2,868