Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue:
Total revenue	$ 7,037	$ 8,623
Cost of revenue:
Total cost of revenue	2,113	2,607
Gross margin	4,924	6,016
Operating expenses:
Research and development	2,447	2,367
Sales and marketing	2,946	2,947
General and administrative	3,620	2,230
Total operating expenses	9,013	7,544
Operating loss	(4,089)	(1,528)
Interest income (expense), net	3	(4)
Net loss	(4,086)	(1,532)
Cumulative dividend on Series A convertible preferred stock	(331)	(333)
Net loss attributable to common stockholders	$ (4,417)	$ (1,865)
Net loss per share attributable to common stockholders:
Basic	$ (0.06)	$ (0.02)
Diluted	$ (0.06)	$ (0.02)
Weighted average number of common shares and equivalents:
Basic	75,877,391	75,175,412
Diluted	75,877,391	75,175,412
Systems [Member]
Revenue:
Total revenue	$ 1,634	$ 2,602
Cost of revenue:
Total cost of revenue	1,292	1,435
Disposables Service and Accessories [Member]
Revenue:
Total revenue	5,403	5,774
Cost of revenue:
Total cost of revenue	821	925
Sublease [Member]
Revenue:
Total revenue		247
Cost of revenue:
Total cost of revenue		$ 247