CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue
Product and service revenue	$ 6,987	$ 6,072	$ 19,701	$ 15,579
Lease	1,285	1,073	3,536	2,519
Total revenue	8,272	7,145	23,237	18,098
Cost of revenue (exclusive of amortization)
Total cost of revenue	4,421	3,249	11,034	8,688
Operating expenses
Selling, general and administrative expenses	6,523	6,290	18,076	15,110
Research and development expenses	3,184	2,005	8,936	5,010
Amortization of intangible assets	309	313	931	944
Operating loss	(6,165)	(4,712)	(15,740)	(11,654)
Other income (expense)
Interest expense		(65)		(1,340)
Other income, net	10	14	41	48
Net loss attributable to common stockholders	$ (6,155)	$ (4,763)	$ (15,699)	$ (12,946)
Net loss per share attributable to common stockholders
Basic and diluted	$ (0.65)	$ (0.64)	$ (1.69)	$ (4.04)
Weighted-average number of shares used in calculation of net loss per share:
Basic and diluted	9,439	7,465	9,308	3,202
Product
Revenue
Product and service revenue	$ 6,084	$ 5,264	$ 17,298	$ 13,360
Cost of revenue (exclusive of amortization)
Total cost of revenue	2,915	2,356	7,371	5,824
Service
Revenue
Product and service revenue	903	808	2,403	2,219
Cost of revenue (exclusive of amortization)
Total cost of revenue	1,058	684	2,696	1,959
Lease
Cost of revenue (exclusive of amortization)
Total cost of revenue	$ 448	$ 209	$ 967	$ 905