STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue
Product and service revenue	$ 29,493	$ 22,781
Lease	4,966	3,601
Total revenue	34,459	26,382
Cost of revenue (exclusive of amortization)
Total cost of revenue	16,626	12,307
Operating expenses
Selling, general and administrative expenses	23,887	23,768
Research and development expenses	12,358	7,553
Amortization of intangible assets	1,240	1,256
Operating loss	(19,652)	(18,502)
Other income (expense)
Interest expense		(1,340)
Other income, net	51	68
Net loss attributable to common stockholders	$ (19,601)	$ (19,774)
Net loss per share attributable to common stockholders
Basic and diluted	$ (2.09)	$ (4.28)
Weighted-average number of shares used in calculation of net loss per share:
Basic and diluted	9,374	4,621
Product
Revenue
Product and service revenue	$ 26,246	$ 19,831
Cost of revenue (exclusive of amortization)
Total cost of revenue	11,845	8,303
Service
Revenue
Product and service revenue	3,247	2,950
Cost of revenue (exclusive of amortization)
Total cost of revenue	3,406	2,868
Lease
Cost of revenue (exclusive of amortization)
Total cost of revenue	$ 1,375	$ 1,136